mars.dataframe.Series.str.lower#

Series.str.lower()#

Convert strings in the Series/Index to lowercase.

Equivalent to str.lower().

返回类型: Series or Index of object

参见

Series.str.lower: Converts all characters to lowercase.
Series.str.upper: Converts all characters to uppercase.
Series.str.title: Converts first character of each word to uppercase and remaining to lowercase.
Series.str.capitalize: Converts first character to uppercase and remaining to lowercase.
Series.str.swapcase: Converts uppercase to lowercase and lowercase to uppercase.
Series.str.casefold: Removes all case distinctions in the string.

示例

>>> import mars.dataframe as md
>>> s = md.Series(['lower', 'CAPITALS', 'this is a sentence', 'SwApCaSe'])
>>> s.execute()
0                 lower
1              CAPITALS
2    this is a sentence
3              SwApCaSe
dtype: object

>>> s.str.lower().execute()
0                 lower
1              capitals
2    this is a sentence
3              swapcase
dtype: object

>>> s.str.upper().execute()
0                 LOWER
1              CAPITALS
2    THIS IS A SENTENCE
3              SWAPCASE
dtype: object

>>> s.str.title().execute()
0                 Lower
1              Capitals
2    This Is A Sentence
3              Swapcase
dtype: object

>>> s.str.capitalize().execute()
0                 Lower
1              Capitals
2    This is a sentence
3              Swapcase
dtype: object

>>> s.str.swapcase().execute()
0                 LOWER
1              capitals
2    THIS IS A SENTENCE
3              sWaPcAsE
dtype: object