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Issue #10587: Document the meaning of str methods.

This commit is contained in:
Alexander Belopolsky 2010-12-23 02:58:25 +00:00
parent 86f65d5dbb
commit 0d26798bbc
1 changed files with 23 additions and 9 deletions
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32
Doc/library/stdtypes.rst
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@ -1078,20 +1078,26 @@ functions based on regular expressions.
.. method:: str.isalnum()
Return true if all characters in the string are alphanumeric and there is at
least one character, false otherwise.
least one character, false otherwise. A character ``c`` is alphanumeric if one
of the following returns ``True``: ``c.isalpha()``, ``c.isdecimal()``,
``c.isdigit()``, or ``c.isnumeric()``.
.. method:: str.isalpha()
Return true if all characters in the string are alphabetic and there is at least
one character, false otherwise.
one character, false otherwise. Alphabetic characters are those characters defined
in the Unicode character database as "Letter", i.e., those with general category
property being one of "Lm", "Lt", "Lu", "Ll", or "Lo". Note that this is different
from the "Alphabetic" property defined in the Unicode Standard.
.. method:: str.isdecimal()
Return true if all characters in the string are decimal
characters and there is at least one character, false
otherwise. Decimal characters include digit characters, and all characters
otherwise. Decimal characters are those from general category "Nd". This category
includes digit characters, and all characters
that that can be used to form decimal-radix numbers, e.g. U+0660,
ARABIC-INDIC DIGIT ZERO.
@ -1099,7 +1105,9 @@ functions based on regular expressions.
.. method:: str.isdigit()
Return true if all characters in the string are digits and there is at least one
character, false otherwise.
character, false otherwise. Digits include decimal characters and digits that need
special handling, such as the compatibility superscript digits. Formally, a digit
is a character that has the property value Numeric_Type=Digit or Numeric_Type=Decimal.
.. method:: str.isidentifier()
@ -1111,7 +1119,9 @@ functions based on regular expressions.
.. method:: str.islower()
Return true if all cased characters in the string are lowercase and there is at
least one cased character, false otherwise.
least one cased character, false otherwise. Cased characters are those with
general category property being one of "Lu", "Ll", or "Lt" and lowercase characters
are those with general category property "Ll".
.. method:: str.isnumeric()
@ -1120,7 +1130,8 @@ functions based on regular expressions.
characters, and there is at least one character, false
otherwise. Numeric characters include digit characters, and all characters
that have the Unicode numeric value property, e.g. U+2155,
VULGAR FRACTION ONE FIFTH.
VULGAR FRACTION ONE FIFTH. Formally, numeric characters are those with the property
value Numeric_Type=Digit, Numeric_Type=Decimal or Numeric_Type=Numeric.
.. method:: str.isprintable()
@ -1137,8 +1148,9 @@ functions based on regular expressions.
.. method:: str.isspace()
Return true if there are only whitespace characters in the string and there is
at least one character, false otherwise.
at least one character, false otherwise. Whitespace characters are those
characters defined in the Unicode character database as "Other" or "Separator"
and those with bidirectional property being one of "WS", "B", or "S".
.. method:: str.istitle()
@ -1150,7 +1162,9 @@ functions based on regular expressions.
.. method:: str.isupper()
Return true if all cased characters in the string are uppercase and there is at
least one cased character, false otherwise.
least one cased character, false otherwise. Cased characters are those with
general category property being one of "Lu", "Ll", or "Lt" and uppercase characters
are those with general category property "Lu".
.. method:: str.join(iterable)