parameters: (self)
return_statement: return self._return_or_inplace(libstrings.is_lower(self._column))
docstring: Check whether all characters in each string are lowercase.
  
          This is equivalent to running the Python string method
          `str.islower()
          <https://docs.python.org/3/library/stdtypes.html#str.islower>`_
          for each element of the Series/Index.
          If a string has zero characters, False is returned
          for that check.
  
          Returns
          -------
          Series or Index of bool
              Series or Index of boolean values with the same
              length as the original Series/Index.
  
          See also
          --------
          isalnum
              Check whether all characters are alphanumeric.
  
          isalpha
              Check whether all characters are alphabetic.
  
          isdecimal
              Check whether all characters are decimal.
  
          isdigit
              Check whether all characters are digits.
  
          isinteger
              Check whether all characters are integer.
  
          isnumeric
              Check whether all characters are numeric.
  
          isfloat
              Check whether all characters are float.
  
          isspace
              Check whether all characters are whitespace.
  
          isupper
              Check whether all characters are uppercase.
  
          Examples
          --------
          >>> import cudf
          >>> s = cudf.Series(['leopard', 'Golden Eagle', 'SNAKE', ''])
          >>> s.str.islower()
          0     True
          1    False
          2    False
          3    False
          dtype: bool
docstring_summary: Check whether all characters in each string are lowercase.
docstring_tokens: Check whether all characters in each string are lowercase .
function: def islower(self) -> SeriesOrIndex:
          """
          Check whether all characters in each string are lowercase.
  
          This is equivalent to running the Python string method
          `str.islower()
          <https://docs.python.org/3/library/stdtypes.html#str.islower>`_
          for each element of the Series/Index.
          If a string has zero characters, False is returned
          for that check.
  
          Returns
          -------
          Series or Index of bool
              Series or Index of boolean values with the same
              length as the original Series/Index.
  
          See also
          --------
          isalnum
              Check whether all characters are alphanumeric.
  
          isalpha
              Check whether all characters are alphabetic.
  
          isdecimal
              Check whether all characters are decimal.
  
          isdigit
              Check whether all characters are digits.
  
          isinteger
              Check whether all characters are integer.
  
          isnumeric
              Check whether all characters are numeric.
  
          isfloat
              Check whether all characters are float.
  
          isspace
              Check whether all characters are whitespace.
  
          isupper
              Check whether all characters are uppercase.
  
          Examples
          --------
          >>> import cudf
          >>> s = cudf.Series(['leopard', 'Golden Eagle', 'SNAKE', ''])
          >>> s.str.islower()
          0     True
          1    False
          2    False
          3    False
          dtype: bool
          """
          return self._return_or_inplace(libstrings.is_lower(self._column))
function_tokens: def islower ( self ) -> SeriesOrIndex : return self . _return_or_inplace ( libstrings . is_lower ( self . _column ) )