original_docstring: 
          A valid postcode should be 6 digits with no white spaces, letters or other symbols.
          
docstring: A valid postcode should be 6 digits with no white spaces, letters or other symbols.
docstring_tokens: A valid postcode should be 6 digits with no white spaces letters or other symbols .
code: def only_numbers(postcode):
          '''
          A valid postcode should be 6 digits with no white spaces, letters or other symbols.
          '''
          if any([c not in '0123456789' for c in postcode]):
              return False
          return func(postcode)
code_tokens: def only_numbers ( postcode ) : if any ( [ c not in '0123456789' for c in postcode ] ) : return False return func ( postcode )
short_docstring: A valid postcode should be 6 digits with no white spaces, letters or other symbols.
short_docstring_tokens: A valid postcode should be 6 digits with no white spaces letters or other symbols .
comment: '''
          A valid postcode should be 6 digits with no white spaces, letters or other symbols.
          '''