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| -rw-r--r-- | Doc/library/stdtypes.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst index e3c8b151cd..e24c4508ea 100644 --- a/Doc/library/stdtypes.rst +++ b/Doc/library/stdtypes.rst @@ -1047,6 +1047,15 @@ functions based on regular expressions. *start* and *end* are interpreted as in slice notation. Return ``-1`` if *sub* is not found. + .. note:: + + The :meth:`~str.find` method should be used only if you need to know the + position of *sub*. To check if *sub* is a substring or not, use the + :keyword:`in` operator:: + + >>> 'Py' in 'Python' + True + .. method:: str.format(*args, **kwargs) |