range()——python2与python3不同之处

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def range(start=None, stop=None, step=None): # known special case of range　　
    """
　　
    range(stop) -> list of integers
　　
    range(start, stop[, step]) -> list of integers
　　

　　
    Return a list containing an arithmetic progression of integers.
　　
    range(i, j) returns [i, i+1, i+2, ..., j-1]; start (!) defaults to 0.
　　
    When step is given, it specifies the increment (or decrement).
　　
    For example, range(4) returns [0, 1, 2, 3].  The end point is omitted!
　　
    These are exactly the valid indices for a list of 4 elements.
　　
    """
　　
    pass