diff --git a/mylib/__init__.py b/mylib/__init__.py
index 68f8086..6898a9f 100644
--- a/mylib/__init__.py
+++ b/mylib/__init__.py
@@ -49,8 +49,8 @@ def pretty_format_dict(value, encoding='utf8', prefix=None):
     result = []
     for key in sorted(value.keys()):
         result.append(
-            f'{prefix}- {key} : ' +
-            pretty_format_value_in_list(
+            f'{prefix}- {key} : '
+            + pretty_format_value_in_list(
                 value[key],
                 encoding=encoding,
                 prefix=prefix
@@ -65,8 +65,8 @@ def pretty_format_list(row, encoding='utf8', prefix=None):
     result = []
     for idx, values in enumerate(row):
         result.append(
-            f'{prefix}- #{idx} : ' +
-            pretty_format_value_in_list(
+            f'{prefix}- #{idx} : '
+            + pretty_format_value_in_list(
                 values,
                 encoding=encoding,
                 prefix=prefix
diff --git a/mylib/email.py b/mylib/email.py
index 2deab40..ed26b0d 100644
--- a/mylib/email.py
+++ b/mylib/email.py
@@ -135,10 +135,10 @@ class EmailClient(ConfigurableObject):  # pylint: disable=useless-object-inherit
         msg['Date'] = email.utils.formatdate(None, True)
         encoding = encoding if encoding else self._get_option('encoding')
         if template:
-            assert template in self.templates, "Unknwon template %s" % template
+            assert template in self.templates, f'Unknwon template {template}'
             # Handle subject from template
             if not subject:
-                assert self.templates[template].get('subject'), 'No subject defined in template %s' % template
+                assert self.templates[template].get('subject'), f'No subject defined in template {template}'
                 msg['Subject'] = self.templates[template]['subject'].format(**template_vars)
 
             # Put HTML part in last one to prefered it
@@ -168,14 +168,18 @@ class EmailClient(ConfigurableObject):  # pylint: disable=useless-object-inherit
                     part = MIMEBase('application', "octet-stream")
                     part.set_payload(fp.read())
                     encode_base64(part)
-                    part.add_header('Content-Disposition', 'attachment; filename="%s"' % os.path.basename(filepath))
+                    part.add_header(
+                        'Content-Disposition',
+                        f'attachment; filename="{os.path.basename(filepath)}"')
                     msg.attach(part)
         if attachment_payloads:
             for filename, payload in attachment_payloads:
                 part = MIMEBase('application', "octet-stream")
                 part.set_payload(payload)
                 encode_base64(part)
-                part.add_header('Content-Disposition', 'attachment; filename="%s"' % filename)
+                part.add_header(
+                    'Content-Disposition',
+                    f'attachment; filename="{filename}"')
                 msg.attach(part)
         return msg
 
diff --git a/mylib/opening_hours.py b/mylib/opening_hours.py
index f96d5db..228a97f 100644
--- a/mylib/opening_hours.py
+++ b/mylib/opening_hours.py
@@ -82,7 +82,7 @@ def parse_exceptional_closures(values):
                     pstart = time.strptime(parts[0], date_format)
                     pstop = time.strptime(parts[1], date_format)
                     if pstop <= pstart:
-                        raise ValueError('Day %s <= %s' % (parts[1], parts[0]))
+                        raise ValueError(f'Day {parts[1]} <= {parts[0]}')
 
                     date = datetime.date(pstart.tm_year, pstart.tm_mon, pstart.tm_mday)
                     stop_date = datetime.date(pstop.tm_year, pstop.tm_mon, pstop.tm_mday)
@@ -95,16 +95,16 @@ def parse_exceptional_closures(values):
                     mstart = time_pattern.match(parts[0])
                     mstop = time_pattern.match(parts[1])
                     if not mstart or not mstop:
-                        raise ValueError('"%s" is not a valid time period' % word)
+                        raise ValueError(f'"{word}" is not a valid time period')
                     hstart = datetime.time(int(mstart.group(1)), int(mstart.group(2) or 0))
                     hstop = datetime.time(int(mstop.group(1)), int(mstop.group(2) or 0))
                     if hstop <= hstart:
-                        raise ValueError('Time %s <= %s' % (parts[1], parts[0]))
+                        raise ValueError(f'Time {parts[1]} <= {parts[0]}')
                     hours_periods.append({'start': hstart, 'stop': hstop})
             else:
-                raise ValueError('Invalid number of part in this word: "%s"' % word)
+                raise ValueError(f'Invalid number of part in this word: "{word}"')
         if not days:
-            raise ValueError('No days found in value "%s"' % value)
+            raise ValueError(f'No days found in value "{value}"')
         exceptional_closures.append({'days': days, 'hours_periods': hours_periods})
     return exceptional_closures
 
@@ -123,7 +123,7 @@ def parse_normal_opening_hours(values):
             if len(parts) == 1:
                 # ex: jeudi
                 if word not in week_days:
-                    raise ValueError('"%s" is not a valid week day' % word)
+                    raise ValueError(f'"{word}" is not a valid week day')
                 if word not in days:
                     days.append(word)
             elif len(parts) == 2:
@@ -131,7 +131,7 @@ def parse_normal_opening_hours(values):
                 if parts[0] in week_days and parts[1] in week_days:
                     # ex: lundi-jeudi
                     if week_days.index(parts[1]) <= week_days.index(parts[0]):
-                        raise ValueError('"%s" is before "%s"' % (parts[1], parts[0]))
+                        raise ValueError(f'"{parts[1]}" is before "{parts[0]}"')
                     started = False
                     for d in week_days:
                         if not started and d != parts[0]:
@@ -146,16 +146,16 @@ def parse_normal_opening_hours(values):
                     mstart = time_pattern.match(parts[0])
                     mstop = time_pattern.match(parts[1])
                     if not mstart or not mstop:
-                        raise ValueError('"%s" is not a valid time period' % word)
+                        raise ValueError(f'"{word}" is not a valid time period')
                     hstart = datetime.time(int(mstart.group(1)), int(mstart.group(2) or 0))
                     hstop = datetime.time(int(mstop.group(1)), int(mstop.group(2) or 0))
                     if hstop <= hstart:
-                        raise ValueError('Time %s <= %s' % (parts[1], parts[0]))
+                        raise ValueError(f'Time {parts[1]} <= {parts[0]}')
                     hours_periods.append({'start': hstart, 'stop': hstop})
             else:
-                raise ValueError('Invalid number of part in this word: "%s"' % word)
+                raise ValueError(f'Invalid number of part in this word: "{word}"')
         if not days and not hours_periods:
-            raise ValueError('No days or hours period found in this value: "%s"' % value)
+            raise ValueError(f'No days or hours period found in this value: "{value}"')
         normal_opening_hours.append({'days': days, 'hours_periods': hours_periods})
     return normal_opening_hours
 
@@ -173,18 +173,28 @@ def is_closed(
     when_weekday = week_days[when.timetuple().tm_wday]
     on_error_result = None
     if on_error == 'closed':
-        on_error_result = {'closed': True, 'exceptional_closure': False, 'exceptional_closure_all_day': False}
+        on_error_result = {
+            'closed': True, 'exceptional_closure': False,
+            'exceptional_closure_all_day': False}
     elif on_error == 'opened':
-        on_error_result = {'closed': False, 'exceptional_closure': False, 'exceptional_closure_all_day': False}
+        on_error_result = {
+            'closed': False, 'exceptional_closure': False,
+            'exceptional_closure_all_day': False}
 
-    log.debug("When = %s => date = %s / time = %s / week day = %s", when, when_date, when_time, when_weekday)
+    log.debug(
+        "When = %s => date = %s / time = %s / week day = %s",
+        when, when_date, when_time, when_weekday)
     if nonworking_public_holidays_values:
         log.debug("Nonworking public holidays: %s", nonworking_public_holidays_values)
         nonworking_days = nonworking_french_public_days_of_the_year()
         for day in nonworking_public_holidays_values:
             if day in nonworking_days and when_date == nonworking_days[day]:
                 log.debug("Non working day: %s", day)
-                return {'closed': True, 'exceptional_closure': exceptional_closure_on_nonworking_public_days, 'exceptional_closure_all_day': exceptional_closure_on_nonworking_public_days}
+                return {
+                    'closed': True,
+                    'exceptional_closure': exceptional_closure_on_nonworking_public_days,
+                    'exceptional_closure_all_day': exceptional_closure_on_nonworking_public_days
+                }
 
     if exceptional_closures_values:
         try:
@@ -201,10 +211,14 @@ def is_closed(
                 continue
             if not cl['hours_periods']:
                 # All day exceptional closure
-                return {'closed': True, 'exceptional_closure': True, 'exceptional_closure_all_day': True}
+                return {
+                    'closed': True, 'exceptional_closure': True,
+                    'exceptional_closure_all_day': True}
             for hp in cl['hours_periods']:
                 if hp['start'] <= when_time <= hp['stop']:
-                    return {'closed': True, 'exceptional_closure': True, 'exceptional_closure_all_day': False}
+                    return {
+                        'closed': True, 'exceptional_closure': True,
+                        'exceptional_closure_all_day': False}
 
     if normal_opening_hours_values:
         try:
@@ -221,12 +235,21 @@ def is_closed(
                 continue
             if not oh['hours_periods']:
                 # All day opened
-                return {'closed': False, 'exceptional_closure': False, 'exceptional_closure_all_day': False}
+                return {
+                    'closed': False, 'exceptional_closure': False,
+                    'exceptional_closure_all_day': False}
             for hp in oh['hours_periods']:
                 if hp['start'] <= when_time <= hp['stop']:
-                    return {'closed': False, 'exceptional_closure': False, 'exceptional_closure_all_day': False}
+                    return {
+                        'closed': False, 'exceptional_closure': False,
+                        'exceptional_closure_all_day': False}
         log.debug("Not in normal opening hours => closed")
-        return {'closed': True, 'exceptional_closure': False, 'exceptional_closure_all_day': False}
+        return {
+            'closed': True, 'exceptional_closure': False,
+            'exceptional_closure_all_day': False}
 
-    # Not a nonworking day, not during exceptional closure and no normal opening hours defined => Opened
-    return {'closed': False, 'exceptional_closure': False, 'exceptional_closure_all_day': False}
+    # Not a nonworking day, not during exceptional closure and no normal opening
+    # hours defined => Opened
+    return {
+        'closed': False, 'exceptional_closure': False,
+        'exceptional_closure_all_day': False}
diff --git a/mylib/scripts/helpers.py b/mylib/scripts/helpers.py
index 666ce28..b3b6b60 100644
--- a/mylib/scripts/helpers.py
+++ b/mylib/scripts/helpers.py
@@ -14,7 +14,7 @@ log = logging.getLogger(__name__)
 
 def init_logging(options, name, report=None):
     """ Initialize logging from calling script options """
-    logformat = '%(asctime)s - ' + name + ' - %(levelname)s - %(message)s'
+    logformat = f'%(asctime)s - {name} - %(levelname)s - %(message)s'
     if options.debug:
         loglevel = logging.DEBUG
     elif options.verbose:
@@ -64,7 +64,9 @@ def get_opts_parser(desc=None, just_try=False, just_one=False, progress=False, c
         action="store",
         type=str,
         dest="logfile",
-        help="Log file path (default: %s)" % get_default_opt_value(config, default_config, 'logfile'),
+        help=(
+            'Log file path (default: '
+            f'{get_default_opt_value(config, default_config, "logfile")})'),
         default=get_default_opt_value(config, default_config, 'logfile')
     )
 
@@ -109,7 +111,7 @@ def add_email_opts(parser, config=None):
     default_config = dict(
         smtp_host="127.0.0.1", smtp_port=25, smtp_ssl=False, smtp_tls=False, smtp_user=None,
         smtp_password=None, smtp_debug=False, email_encoding=sys.getdefaultencoding(),
-        sender_name=getpass.getuser(), sender_email=getpass.getuser() + '@' + socket.gethostname(),
+        sender_name=getpass.getuser(), sender_email=f'{getpass.getuser()}@{socket.gethostname()}',
         catch_all=False
     )
 
@@ -118,7 +120,9 @@ def add_email_opts(parser, config=None):
         action="store",
         type=str,
         dest="email_smtp_host",
-        help="SMTP host (default: %s)" % get_default_opt_value(config, default_config, 'smtp_host'),
+        help=(
+            'SMTP host (default: '
+            f'{get_default_opt_value(config, default_config, "smtp_host")})'),
         default=get_default_opt_value(config, default_config, 'smtp_host')
     )
 
@@ -127,7 +131,7 @@ def add_email_opts(parser, config=None):
         action="store",
         type=int,
         dest="email_smtp_port",
-        help="SMTP port (default: %s)" % get_default_opt_value(config, default_config, 'smtp_port'),
+        help=f'SMTP port (default: {get_default_opt_value(config, default_config, "smtp_port")})',
         default=get_default_opt_value(config, default_config, 'smtp_port')
     )
 
@@ -135,7 +139,7 @@ def add_email_opts(parser, config=None):
         '--smtp-ssl',
         action="store_true",
         dest="email_smtp_ssl",
-        help="Use SSL (default: %s)" % get_default_opt_value(config, default_config, 'smtp_ssl'),
+        help=f'Use SSL (default: {get_default_opt_value(config, default_config, "smtp_ssl")})',
         default=get_default_opt_value(config, default_config, 'smtp_ssl')
     )
 
@@ -143,7 +147,7 @@ def add_email_opts(parser, config=None):
         '--smtp-tls',
         action="store_true",
         dest="email_smtp_tls",
-        help="Use TLS (default: %s)" % get_default_opt_value(config, default_config, 'smtp_tls'),
+        help=f'Use TLS (default: {get_default_opt_value(config, default_config, "smtp_tls")})',
         default=get_default_opt_value(config, default_config, 'smtp_tls')
     )
 
@@ -152,7 +156,7 @@ def add_email_opts(parser, config=None):
         action="store",
         type=str,
         dest="email_smtp_user",
-        help="SMTP username (default: %s)" % get_default_opt_value(config, default_config, 'smtp_user'),
+        help=f'SMTP username (default: {get_default_opt_value(config, default_config, "smtp_user")})',
         default=get_default_opt_value(config, default_config, 'smtp_user')
     )
 
@@ -161,7 +165,7 @@ def add_email_opts(parser, config=None):
         action="store",
         type=str,
         dest="email_smtp_password",
-        help="SMTP password (default: %s)" % get_default_opt_value(config, default_config, 'smtp_password'),
+        help=f'SMTP password (default: {get_default_opt_value(config, default_config, "smtp_password")})',
         default=get_default_opt_value(config, default_config, 'smtp_password')
     )
 
@@ -169,7 +173,7 @@ def add_email_opts(parser, config=None):
         '--smtp-debug',
         action="store_true",
         dest="email_smtp_debug",
-        help="Debug SMTP connection (default: %s)" % get_default_opt_value(config, default_config, 'smtp_debug'),
+        help=f'Debug SMTP connection (default: {get_default_opt_value(config, default_config, "smtp_debug")})',
         default=get_default_opt_value(config, default_config, 'smtp_debug')
     )
 
@@ -178,7 +182,7 @@ def add_email_opts(parser, config=None):
         action="store",
         type=str,
         dest="email_encoding",
-        help="SMTP encoding (default: %s)" % get_default_opt_value(config, default_config, 'email_encoding'),
+        help=f'SMTP encoding (default: {get_default_opt_value(config, default_config, "email_encoding")})',
         default=get_default_opt_value(config, default_config, 'email_encoding')
     )
 
@@ -187,7 +191,7 @@ def add_email_opts(parser, config=None):
         action="store",
         type=str,
         dest="email_sender_name",
-        help="Sender name (default: %s)" % get_default_opt_value(config, default_config, 'sender_name'),
+        help=f'Sender name (default: {get_default_opt_value(config, default_config, "sender_name")})',
         default=get_default_opt_value(config, default_config, 'sender_name')
     )
 
@@ -196,7 +200,7 @@ def add_email_opts(parser, config=None):
         action="store",
         type=str,
         dest="email_sender_email",
-        help="Sender email (default: %s)" % get_default_opt_value(config, default_config, 'sender_email'),
+        help=f'Sender email (default: {get_default_opt_value(config, default_config, "sender_email")})',
         default=get_default_opt_value(config, default_config, 'sender_email')
     )
 
@@ -205,7 +209,9 @@ def add_email_opts(parser, config=None):
         action="store",
         type=str,
         dest="email_catch_all",
-        help="Catch all sent email: specify catch recipient email address (default: %s)" % get_default_opt_value(config, default_config, 'catch_all'),
+        help=(
+            'Catch all sent email: specify catch recipient email address '
+            f'(default: {get_default_opt_value(config, default_config, "catch_all")})'),
         default=get_default_opt_value(config, default_config, 'catch_all')
     )
 
diff --git a/mylib/scripts/ldap_test.py b/mylib/scripts/ldap_test.py
index 68a3fb7..6be1185 100644
--- a/mylib/scripts/ldap_test.py
+++ b/mylib/scripts/ldap_test.py
@@ -29,49 +29,49 @@ def main(argv=None):  # pylint: disable=too-many-locals,too-many-statements
     init_logging(options, 'Test LDAP helpers')
 
     now = datetime.datetime.now().replace(tzinfo=dateutil.tz.tzlocal())
-    print("Now = %s" % now)
+    print(f'Now = {now}')
 
     datestring_now = format_datetime(now)
-    print("format_datetime : %s" % datestring_now)
-    print("format_datetime (from_timezone=utc) : %s" % format_datetime(now.replace(tzinfo=None), from_timezone=pytz.utc))
-    print("format_datetime (from_timezone=local) : %s" % format_datetime(now.replace(tzinfo=None), from_timezone=dateutil.tz.tzlocal()))
-    print("format_datetime (from_timezone='local') : %s" % format_datetime(now.replace(tzinfo=None), from_timezone='local'))
-    print("format_datetime (from_timezone=Paris) : %s" % format_datetime(now.replace(tzinfo=None), from_timezone='Europe/Paris'))
-    print("format_datetime (to_timezone=utc) : %s" % format_datetime(now, to_timezone=pytz.utc))
-    print("format_datetime (to_timezone=local) : %s" % format_datetime(now, to_timezone=dateutil.tz.tzlocal()))
-    print("format_datetime (to_timezone='local') : %s" % format_datetime(now, to_timezone='local'))
-    print("format_datetime (to_timezone=Tokyo) : %s" % format_datetime(now, to_timezone='Asia/Tokyo'))
-    print("format_datetime (naive=True) : %s" % format_datetime(now, naive=True))
+    print(f'format_datetime : {datestring_now}')
+    print(f'format_datetime (from_timezone=utc) : {format_datetime(now.replace(tzinfo=None), from_timezone=pytz.utc)}')
+    print(f'format_datetime (from_timezone=local) : {format_datetime(now.replace(tzinfo=None), from_timezone=dateutil.tz.tzlocal())}')
+    print(f'format_datetime (from_timezone=local) : {format_datetime(now.replace(tzinfo=None), from_timezone="local")}')
+    print(f'format_datetime (from_timezone=Paris) : {format_datetime(now.replace(tzinfo=None), from_timezone="Europe/Paris")}')
+    print(f'format_datetime (to_timezone=utc) : {format_datetime(now, to_timezone=pytz.utc)}')
+    print(f'format_datetime (to_timezone=local) : {format_datetime(now, to_timezone=dateutil.tz.tzlocal())}')
+    print(f'format_datetime (to_timezone=local) : {format_datetime(now, to_timezone="local")}')
+    print(f'format_datetime (to_timezone=Tokyo) : {format_datetime(now, to_timezone="Asia/Tokyo")}')
+    print(f'format_datetime (naive=True) : {format_datetime(now, naive=True)}')
 
-    print("format_date : %s" % format_date(now))
-    print("format_date (from_timezone=utc) : %s" % format_date(now.replace(tzinfo=None), from_timezone=pytz.utc))
-    print("format_date (from_timezone=local) : %s" % format_date(now.replace(tzinfo=None), from_timezone=dateutil.tz.tzlocal()))
-    print("format_date (from_timezone='local') : %s" % format_date(now.replace(tzinfo=None), from_timezone='local'))
-    print("format_date (from_timezone=Paris) : %s" % format_date(now.replace(tzinfo=None), from_timezone='Europe/Paris'))
-    print("format_date (to_timezone=utc) : %s" % format_date(now, to_timezone=pytz.utc))
-    print("format_date (to_timezone=local) : %s" % format_date(now, to_timezone=dateutil.tz.tzlocal()))
-    print("format_date (to_timezone='local') : %s" % format_date(now, to_timezone='local'))
-    print("format_date (to_timezone=Tokyo) : %s" % format_date(now, to_timezone='Asia/Tokyo'))
-    print("format_date (naive=True) : %s" % format_date(now, naive=True))
+    print(f'format_date : {format_date(now)}')
+    print(f'format_date (from_timezone=utc) : {format_date(now.replace(tzinfo=None), from_timezone=pytz.utc)}')
+    print(f'format_date (from_timezone=local) : {format_date(now.replace(tzinfo=None), from_timezone=dateutil.tz.tzlocal())}')
+    print(f'format_date (from_timezone=local) : {format_date(now.replace(tzinfo=None), from_timezone="local")}')
+    print(f'format_date (from_timezone=Paris) : {format_date(now.replace(tzinfo=None), from_timezone="Europe/Paris")}')
+    print(f'format_date (to_timezone=utc) : {format_date(now, to_timezone=pytz.utc)}')
+    print(f'format_date (to_timezone=local) : {format_date(now, to_timezone=dateutil.tz.tzlocal())}')
+    print(f'format_date (to_timezone=local) : {format_date(now, to_timezone="local")}')
+    print(f'format_date (to_timezone=Tokyo) : {format_date(now, to_timezone="Asia/Tokyo")}')
+    print(f'format_date (naive=True) : {format_date(now, naive=True)}')
 
-    print("parse_datetime : %s" % parse_datetime(datestring_now))
-    print("parse_datetime (default_timezone=utc) : %s" % parse_datetime(datestring_now[0:-1], default_timezone=pytz.utc))
-    print("parse_datetime (default_timezone=local) : %s" % parse_datetime(datestring_now[0:-1], default_timezone=dateutil.tz.tzlocal()))
-    print("parse_datetime (default_timezone='local') : %s" % parse_datetime(datestring_now[0:-1], default_timezone='local'))
-    print("parse_datetime (default_timezone=Paris) : %s" % parse_datetime(datestring_now[0:-1], default_timezone='Europe/Paris'))
-    print("parse_datetime (to_timezone=utc) : %s" % parse_datetime(datestring_now, to_timezone=pytz.utc))
-    print("parse_datetime (to_timezone=local) : %s" % parse_datetime(datestring_now, to_timezone=dateutil.tz.tzlocal()))
-    print("parse_datetime (to_timezone='local') : %s" % parse_datetime(datestring_now, to_timezone='local'))
-    print("parse_datetime (to_timezone=Tokyo) : %s" % parse_datetime(datestring_now, to_timezone='Asia/Tokyo'))
-    print("parse_datetime (naive=True) : %s" % parse_datetime(datestring_now, naive=True))
+    print(f'parse_datetime : {parse_datetime(datestring_now)}')
+    print(f'parse_datetime (default_timezone=utc) : {parse_datetime(datestring_now[0:-1], default_timezone=pytz.utc)}')
+    print(f'parse_datetime (default_timezone=local) : {parse_datetime(datestring_now[0:-1], default_timezone=dateutil.tz.tzlocal())}')
+    print(f'parse_datetime (default_timezone=local) : {parse_datetime(datestring_now[0:-1], default_timezone="local")}')
+    print(f'parse_datetime (default_timezone=Paris) : {parse_datetime(datestring_now[0:-1], default_timezone="Europe/Paris")}')
+    print(f'parse_datetime (to_timezone=utc) : {parse_datetime(datestring_now, to_timezone=pytz.utc)}')
+    print(f'parse_datetime (to_timezone=local) : {parse_datetime(datestring_now, to_timezone=dateutil.tz.tzlocal())}')
+    print(f'parse_datetime (to_timezone=local) : {parse_datetime(datestring_now, to_timezone="local")}')
+    print(f'parse_datetime (to_timezone=Tokyo) : {parse_datetime(datestring_now, to_timezone="Asia/Tokyo")}')
+    print(f'parse_datetime (naive=True) : {parse_datetime(datestring_now, naive=True)}')
 
-    print("parse_date : %s" % parse_date(datestring_now))
-    print("parse_date (default_timezone=utc) : %s" % parse_date(datestring_now[0:-1], default_timezone=pytz.utc))
-    print("parse_date (default_timezone=local) : %s" % parse_date(datestring_now[0:-1], default_timezone=dateutil.tz.tzlocal()))
-    print("parse_date (default_timezone='local') : %s" % parse_date(datestring_now[0:-1], default_timezone='local'))
-    print("parse_date (default_timezone=Paris) : %s" % parse_date(datestring_now[0:-1], default_timezone='Europe/Paris'))
-    print("parse_date (to_timezone=utc) : %s" % parse_date(datestring_now, to_timezone=pytz.utc))
-    print("parse_date (to_timezone=local) : %s" % parse_date(datestring_now, to_timezone=dateutil.tz.tzlocal()))
-    print("parse_date (to_timezone='local') : %s" % parse_date(datestring_now, to_timezone='local'))
-    print("parse_date (to_timezone=Tokyo) : %s" % parse_date(datestring_now, to_timezone='Asia/Tokyo'))
-    print("parse_date (naive=True) : %s" % parse_date(datestring_now, naive=True))
+    print(f'parse_date : {parse_date(datestring_now)}')
+    print(f'parse_date (default_timezone=utc) : {parse_date(datestring_now[0:-1], default_timezone=pytz.utc)}')
+    print(f'parse_date (default_timezone=local) : {parse_date(datestring_now[0:-1], default_timezone=dateutil.tz.tzlocal())}')
+    print(f'parse_date (default_timezone=local) : {parse_date(datestring_now[0:-1], default_timezone="local")}')
+    print(f'parse_date (default_timezone=Paris) : {parse_date(datestring_now[0:-1], default_timezone="Europe/Paris")}')
+    print(f'parse_date (to_timezone=utc) : {parse_date(datestring_now, to_timezone=pytz.utc)}')
+    print(f'parse_date (to_timezone=local) : {parse_date(datestring_now, to_timezone=dateutil.tz.tzlocal())}')
+    print(f'parse_date (to_timezone=local) : {parse_date(datestring_now, to_timezone="local")}')
+    print(f'parse_date (to_timezone=Tokyo) : {parse_date(datestring_now, to_timezone="Asia/Tokyo")}')
+    print(f'parse_date (naive=True) : {parse_date(datestring_now, naive=True)}')
diff --git a/mylib/scripts/pbar_test.py b/mylib/scripts/pbar_test.py
index 57cfca8..c1d6f27 100644
--- a/mylib/scripts/pbar_test.py
+++ b/mylib/scripts/pbar_test.py
@@ -27,7 +27,7 @@ def main(argv=None):  # pylint: disable=too-many-locals,too-many-statements
         action="store",
         type=int,
         dest="count",
-        help="Progress bar max value (default: %s)" % default_max_val,
+        help=f'Progress bar max value (default: {default_max_val})',
         default=default_max_val
     )
 
diff --git a/tests/test_config.py b/tests/test_config.py
index e2fabc4..804cfb8 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -1,4 +1,5 @@
 # pylint: disable=redefined-outer-name,missing-function-docstring,protected-access,global-statement
+# pylint: disable=global-variable-not-assigned
 """ Tests on config lib """
 
 import logging
diff --git a/tests/test_oracle.py b/tests/test_oracle.py
index 8ee3887..1d93759 100644
--- a/tests/test_oracle.py
+++ b/tests/test_oracle.py
@@ -21,10 +21,12 @@ class FakeCXOracleCursor:
     def execute(self, sql, **params):
         assert self.opened
         if self.expected_exception:
-            raise cx_Oracle.Error("%s.execute(%s, %s): expected exception" % (self, sql, params))
+            raise cx_Oracle.Error(f'{self}.execute({sql}, {params}): expected exception')
         if self.expected_just_try and not sql.lower().startswith('select '):
-            assert False, "%s.execute(%s, %s) may not be executed in just try mode" % (self, sql, params)
+            assert False, f'{self}.execute({sql}, {params}) may not be executed in just try mode'
+        # pylint: disable=consider-using-f-string
         assert sql == self.expected_sql, "%s.execute(): Invalid SQL query:\n  '%s'\nMay be:\n  '%s'" % (self, sql, self.expected_sql)
+        # pylint: disable=consider-using-f-string
         assert params == self.expected_params, "%s.execute(): Invalid params:\n  %s\nMay be:\n  %s" % (self, params, self.expected_params)
         return self.expected_return
 
@@ -40,9 +42,9 @@ class FakeCXOracleCursor:
         self.opened = False
 
     def __repr__(self):
-        return "FakeCXOracleCursor(%s, %s, %s, %s)" % (
-            self.expected_sql, self.expected_params,
-            self.expected_return, self.expected_just_try
+        return (
+            f'FakeCXOracleCursor({self.expected_sql}, {self.expected_params}, '
+            f'{self.expected_return}, {self.expected_just_try})'
         )
 
 
@@ -59,8 +61,8 @@ class FakeCXOracle:
     def __init__(self, **kwargs):
         allowed_kwargs = dict(dsn=str, user=str, password=(str, None))
         for arg, value in kwargs.items():
-            assert arg in allowed_kwargs, "Invalid arg %s='%s'" % (arg, value)
-            assert isinstance(value, allowed_kwargs[arg]), "Arg %s not a %s (%s)" % (arg, allowed_kwargs[arg], type(value))
+            assert arg in allowed_kwargs, f"Invalid arg {arg}='{value}'"
+            assert isinstance(value, allowed_kwargs[arg]), f"Arg {arg} not a {allowed_kwargs[arg]} ({type(value)})"
             setattr(self, arg, value)
 
     def close(self):
@@ -127,7 +129,9 @@ def fake_connected_just_try_oracledb(fake_just_try_oracledb):
 
 def generate_mock_args(expected_args=(), expected_kwargs={}, expected_return=True):  # pylint: disable=dangerous-default-value
     def mock_args(*args, **kwargs):
+        # pylint: disable=consider-using-f-string
         assert args == expected_args, "Invalid call args:\n  %s\nMay be:\n  %s" % (args, expected_args)
+        # pylint: disable=consider-using-f-string
         assert kwargs == expected_kwargs, "Invalid call kwargs:\n  %s\nMay be:\n  %s" % (kwargs, expected_kwargs)
         return expected_return
     return mock_args
@@ -139,7 +143,9 @@ def mock_doSQL_just_try(self, sql, params=None):  # pylint: disable=unused-argum
 
 def generate_mock_doSQL(expected_sql, expected_params={}, expected_return=True):  # pylint: disable=dangerous-default-value
     def mock_doSQL(self, sql, params=None):  # pylint: disable=unused-argument
+        # pylint: disable=consider-using-f-string
         assert sql == expected_sql, "Invalid generated SQL query:\n  '%s'\nMay be:\n  '%s'" % (sql, expected_sql)
+        # pylint: disable=consider-using-f-string
         assert params == expected_params, "Invalid generated params:\n  %s\nMay be:\n  %s" % (params, expected_params)
         return expected_return
     return mock_doSQL
diff --git a/tests/test_pgsql.py b/tests/test_pgsql.py
index 054cec8..5c23593 100644
--- a/tests/test_pgsql.py
+++ b/tests/test_pgsql.py
@@ -19,10 +19,12 @@ class FakePsycopg2Cursor:
 
     def execute(self, sql, params=None):
         if self.expected_exception:
-            raise psycopg2.Error("%s.execute(%s, %s): expected exception" % (self, sql, params))
+            raise psycopg2.Error(f'{self}.execute({sql}, {params}): expected exception')
         if self.expected_just_try and not sql.lower().startswith('select '):
-            assert False, "%s.execute(%s, %s) may not be executed in just try mode" % (self, sql, params)
+            assert False, f'{self}.execute({sql}, {params}) may not be executed in just try mode'
+        # pylint: disable=consider-using-f-string
         assert sql == self.expected_sql, "%s.execute(): Invalid SQL query:\n  '%s'\nMay be:\n  '%s'" % (self, sql, self.expected_sql)
+        # pylint: disable=consider-using-f-string
         assert params == self.expected_params, "%s.execute(): Invalid params:\n  %s\nMay be:\n  %s" % (self, params, self.expected_params)
         return self.expected_return
 
@@ -30,9 +32,9 @@ class FakePsycopg2Cursor:
         return self.expected_return
 
     def __repr__(self):
-        return "FakePsycopg2Cursor(%s, %s, %s, %s)" % (
-            self.expected_sql, self.expected_params,
-            self.expected_return, self.expected_just_try
+        return (
+            f'FakePsycopg2Cursor({self.expected_sql}, {self.expected_params}, '
+            f'{self.expected_return}, {self.expected_just_try})'
         )
 
 
@@ -49,8 +51,9 @@ class FakePsycopg2:
     def __init__(self, **kwargs):
         allowed_kwargs = dict(dbname=str, user=str, password=(str, None), host=str)
         for arg, value in kwargs.items():
-            assert arg in allowed_kwargs, "Invalid arg %s='%s'" % (arg, value)
-            assert isinstance(value, allowed_kwargs[arg]), "Arg %s not a %s (%s)" % (arg, allowed_kwargs[arg], type(value))
+            assert arg in allowed_kwargs, f'Invalid arg {arg}="{value}"'
+            assert isinstance(value, allowed_kwargs[arg]), \
+                f'Arg {arg} not a {allowed_kwargs[arg]} ({type(value)})'
             setattr(self, arg, value)
 
     def close(self):
@@ -60,7 +63,7 @@ class FakePsycopg2:
         self._check_just_try()
         assert len(arg) == 1 and isinstance(arg[0], str)
         if self.expected_exception:
-            raise psycopg2.Error("set_client_encoding(%s): Expected exception" % arg[0])
+            raise psycopg2.Error(f'set_client_encoding({arg[0]}): Expected exception')
         return self.expected_return
 
     def cursor(self):
@@ -124,7 +127,9 @@ def fake_connected_just_try_pgdb(fake_just_try_pgdb):
 
 def generate_mock_args(expected_args=(), expected_kwargs={}, expected_return=True):  # pylint: disable=dangerous-default-value
     def mock_args(*args, **kwargs):
+        # pylint: disable=consider-using-f-string
         assert args == expected_args, "Invalid call args:\n  %s\nMay be:\n  %s" % (args, expected_args)
+        # pylint: disable=consider-using-f-string
         assert kwargs == expected_kwargs, "Invalid call kwargs:\n  %s\nMay be:\n  %s" % (kwargs, expected_kwargs)
         return expected_return
     return mock_args
@@ -136,7 +141,9 @@ def mock_doSQL_just_try(self, sql, params=None):  # pylint: disable=unused-argum
 
 def generate_mock_doSQL(expected_sql, expected_params={}, expected_return=True):  # pylint: disable=dangerous-default-value
     def mock_doSQL(self, sql, params=None):  # pylint: disable=unused-argument
+        # pylint: disable=consider-using-f-string
         assert sql == expected_sql, "Invalid generated SQL query:\n  '%s'\nMay be:\n  '%s'" % (sql, expected_sql)
+        # pylint: disable=consider-using-f-string
         assert params == expected_params, "Invalid generated params:\n  %s\nMay be:\n  %s" % (params, expected_params)
         return expected_return
     return mock_doSQL