misc.py 文件源码

def count(start=0, step=1):
    """
    ``itertools.count`` in Py 2.6 doesn't accept a step
    parameter. This is an enhanced version of ``itertools.count``
    for Py2.6 equivalent to ``itertools.count`` in Python 2.7+.
    """
    while True:
        yield start
        start += step


########################################################################
###  ChainMap (helper for configparser and string.Template)
###  From the Py3.4 source code. See also:
###    https://github.com/kkxue/Py2ChainMap/blob/master/py2chainmap.py
########################################################################