diff options
| -rw-r--r-- | Doc/library/stdtypes.rst | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst index d2dfd11..25fda8f 100644 --- a/Doc/library/stdtypes.rst +++ b/Doc/library/stdtypes.rst @@ -1182,8 +1182,28 @@ string functions based on regular expressions. .. method:: str.title() - Return a titlecased version of the string: words start with uppercase - characters, all remaining cased characters are lowercase. + Return a titlecased version of the string where words start with an uppercase + character and the remaining characters are lowercase. + + The algorithm uses a simple language-independent definition of a word as + groups of consecutive letters. The definition works in many contexts but + it means that apostrophes in contractions and possessives form word + boundaries, which may not be the desired result:: + + >>> "they're bill's friends from the UK".title() + "They'Re Bill'S Friends From The Uk" + + A workaround for apostrophes can be constructed using regular expressions:: + + >>> import re + >>> def titlecase(s): + return re.sub(r"[A-Za-z]+('[A-Za-z]+)?", + lambda mo: mo.group(0)[0].upper() + + mo.group(0)[1:].lower(), + s) + + >>> titlecase("they're bill's friends.") + "They're Bill's Friends." For 8-bit strings, this method is locale-dependent. |