code: def uppercase_percent_encoding(text):
      '''Uppercases percent-encoded sequences.'''
      if '%' not in text:
          return text
  
      return re.sub(
          r'%[a-f0-9][a-f0-9]',
          lambda match: match.group(0).upper(),
          textf uppercase_percent_encoding(text):
      '''Uppercases percent-encoded sequences.'''
      if '%' not in text:
          return text
  
      return re.sub(
          r'%[a-f0-9][a-f0-9]',
          lambda match: match.group(0).upper(),
          text)
docs: Uppercases percent-encoded sequences.