tested.py

python web programming 部分

"""Demonstrates the doctest module in action."""

def slen(s, tlen=8):
    """Returns effective length of string,
    allowing for tabs of given length.

    >>> slen(" ")
    1
    >>> slen("\t"), slen(" \t")
    (8, 8)
    >>> [slen(" "*i+"\t") for i in range(16)]
    [8, 8, 8, 8, 8, 8, 8, 8, 16, 16, 16, 16, 16, 16, 16, 16]
    >>> [slen(" "*i+"\t", 3) for i in range(16)]
    [3, 3, 3, 6, 6, 6, 9, 9, 9, 12, 12, 12, 15, 15, 15, 18]
    >>> [slen(" \t"*i) for i in range(10)]
    [0, 8, 16, 24, 32, 40, 48, 56, 64, 72]
    >>> [slen("\t"*i+" ") for i in range(12)]
    [1, 9, 17, 25, 33, 41, 49, 57, 65, 73, 81, 89]
    >>> slen("Hello")
    Traceback (innermost last):
    ...
    ValueError: Illegal white space character
    """
    r = 0
    for c in s:
        if c == " ": r = r+1
        elif c == "\t": r = ((r+tlen)/tlen)*tlen
        else: raise ValueError, "Illegal white space character"
    return r

def _test():
    import doctest, tested
    return doctest.testmod(tested)

if __name__ == "__main__":
    _test()