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improve casefold/lower/upper docs
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@ -1005,7 +1005,16 @@ functions based on regular expressions.
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.. method:: str.casefold()
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Return a casefolded copy of the string. Casefolded strings may be used for
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caseless matching. For example, ``"MASSE".casefold() == "maße".casefold()``.
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caseless matching.
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Casefolding is similar to lowercasing but more aggressive because it is
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intended to remove all case distinctions in a string. For example, the German
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lowercase letter ``'ß'`` is equivalent to ``"ss"``. Since it is already
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lowercase, :meth:`lower` would do nothing to ``'ß'``; :meth:`casefold`
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converts it to ``"ss"``.
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The casefolding algorithm is described in section 3.13 of the Unicode
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Standard.
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.. versionadded:: 3.3
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@ -1217,6 +1226,9 @@ functions based on regular expressions.
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Return a copy of the string with all the cased characters [4]_ converted to
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lowercase.
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The lowercasing algorithm used is described in section 3.13 of the Unicode
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Standard.
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.. method:: str.lstrip([chars])
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@ -1420,7 +1432,11 @@ functions based on regular expressions.
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Return a copy of the string with all the cased characters [4]_ converted to
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uppercase. Note that ``str.upper().isupper()`` might be ``False`` if ``s``
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contains uncased characters or if the Unicode category of the resulting
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character(s) is not "Lu" (Letter, uppercase), but e.g. "Lt" (Letter, titlecase).
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character(s) is not "Lu" (Letter, uppercase), but e.g. "Lt" (Letter,
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titlecase).
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The uppercasing algorithm used is described in section 3.13 of the Unicode
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Standard.
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.. method:: str.zfill(width)
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