range()——python2与python3不同之处
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 ; start (!) defaults to 0.
When step is given, it specifies the increment (or decrement).
For example, range(4) returns .The end point is omitted!
These are exactly the valid indices for a list of 4 elements.
"""
pass
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