input: def transform_to_list_comprehension(input_code):
      """ Rewrite the given Python code by introducing list comprehensions.
      >>> transform_to_list_comprehension(["even_numbers = []\\nfor i in range(1,21):\\n    if i % 2 == 0:\\n        even_numbers.append(i)\\n"])
      ["even_numbers = [i for i in range(1, 21) if i % 2 == 0]"]
      """
output:     lines = input_code[0].split('\\n')
      result = []
      i = 0
      while i < len(lines):
          if 'for' in lines[i] and 'in' in lines[i] and 'if' in lines[i+1]:
              var = lines[i].split()[1]
              range_expr = lines[i].split('in')[1].strip()
              condition = lines[i+1].split('if')[1].strip()
              result.append(f"{lines[0].split('=')[0].strip()} = [{var} for {var} in {range_expr} if {condition}]")
              i += 3
          else:
              result.append(lines[i])
              i += 1
      return [result[0]]