Dimitri Papadopoulos Orfanos added the comment:
In Python 2, as far as I can understand, string.whitespace and str.isspace()
are different:
* str.isspace() is built upon the C isspace() function and is therefore
locale-dependant. Python heavily relies on isspace() to detect "whitespace"
characters.
* string.whitespace is a list of "ASCII whitespace characters" carved in stone.
As far as I can see string.whitespace is defined but not used anywhere in
Python source code.
See source code:
* Modules/stringobject.c around line 3319:
[...]
string_isspace(PyStringObject *self)
{
[...]
e = p + PyString_GET_SIZE(self);
for (; p < e; p++) {
if (!isspace(*p))
return PyBool_FromLong(0);
}
return PyBool_FromLong(1);
[...]
* Lib/string.py near line 23:
whitespace = ' \t\n\r\v\f'
Functions strip()/lstrip()/rstrip() use str.isspace() and have nothing to do
with string.whitespace:
* Modules/stringobject.c around line 1861:
[...]
do_strip(PyStringObject *self, int striptype)
{
[...]
i = 0;
if (striptype != RIGHTSTRIP) {
while (i < len && isspace(Py_CHARMASK(s[i]))) {
i++;
}
}
[...]
Therefore I suggest the documentation of Python 2.7 points to str.isspace()
wherever the term "whitespace" is used in the documentation - including this
specific case of strip()/lstrip()/rstrip().
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