diff --git a/update/cn_loc.py b/update/cn_loc.py
index e8debf74..7d0805a2 100755
--- a/update/cn_loc.py
+++ b/update/cn_loc.py
@@ -76,8 +76,8 @@ def group_data(data_collection):
     for code, name in sorted(data_collection.items()):
         if code.endswith('00'):
             continue  # county only
-        province_code = code[:2] + '0000'
-        prefecture_code = code[:4] + '00'
+        province_code = f"{code[:2]}0000"
+        prefecture_code = f"{code[:4]}00"
         province_name = data_collection[province_code]
         prefecture_name = data_collection[prefecture_code]
         yield code, name, prefecture_name, province_name
diff --git a/update/iban.py b/update/iban.py
index 3e954e6c..fd58a1ec 100755
--- a/update/iban.py
+++ b/update/iban.py
@@ -64,7 +64,7 @@ def get_country_codes(line):
         bban = bban.replace(' ', '')
         cc = data['IBAN prefix country code (ISO 3166)'][:2]
         cname = data['Name of country']
-        if bban.startswith(cc + '2!n'):
+        if bban.startswith(f"{cc}2!n"):
             bban = bban[5:]
         # print country line
         print('%s country="%s" bban="%s"' % (cc, cname, bban))
diff --git a/update/imsi.py b/update/imsi.py
index f070a5eb..503828ec 100755
--- a/update/imsi.py
+++ b/update/imsi.py
@@ -106,11 +106,7 @@
 remove_ref_re = re.compile(r'<ref>.*?</ref>')
 remove_comment_re = re.compile(r'{{.*?}}')
 quotes = u'\xab\xbb\u201c\u201d\u2018\u2019'
-remove_href_re = re.compile(r'(?i)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+' +
-                            r'[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|' +
-                            r'(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|' +
-                            r'(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>' +
-                            r'?' + quotes + ']))')
+remove_href_re = re.compile("(?i)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|"+|'}(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|"+|'}(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>"<>'}?"'?' + quotes}]))")
 
 
 def cleanup_value(val):
@@ -138,14 +134,7 @@ def cleanup_value(val):
 # This matches a line containing a MCC/MNC, e.g.
 # | 232 || 02 || || A1 Telekom Austria || Reserved || ||
 _mnc_line_re = re.compile(
-    r'^\|\s*(?P<mcc>[0-9]+)' +
-    r'\s*\\\\\s*(?P<mnc>[0-9]+)' +
-    r'(\s*\\\\\s*(?P<brand>[^\\]*)' +
-    r'(\s*\\\\\s*(?P<operator>[^\\]*)' +
-    r'(\s*\\\\\s*(?P<status>[^\\]*)' +
-    r'(\s*\\\\\s*(?P<bands>[^\\]*)' +
-    r'(\s*\\\\\s*(?P<notes>[^\\]*)' +
-    r')?)?)?)?)?')
+    "^\|\s*(?P<mcc>[0-9]+)\s*\\\\\s*(?P<mnc>[0-9]+)"+)'}(\s*\\\\\s*(?P<brand>[^\\]*)"*)'}(\s*\\\\\s*(?P<operator>[^\\]*)"*)'}(\s*\\\\\s*(?P<status>[^\\]*)"*)'}(\s*\\\\\s*(?P<bands>[^\\]*)"*)'}(\s*\\\\\s*(?P<notes>[^\\]*)"*)'})?)?)?)?)?")
 
 
 def get_mncs_from_wikipedia():
@@ -187,7 +176,7 @@ def str2range(x):
     for part in x.split(','):
         if '-' in part:
             a, b = part.split('-')
-            f = '%0' + str(len(b)) + 'd'
+            f = f'%0{str(len(b))}'b))}d"
             a, b = int(a), int(b)
             for i in range(a, b + 1):
                 result.append(f % (i))