[python] 进度条效果

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method 1

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tqdm(iter,ncols=40)
"""
ncols : int, optional
The width of the entire output message.If specified, dynamically resizes the progressbar to stay within this bound.
If unspecified, attempts to use environment width.The fallback is a meter width of 10 and no limit for the counter and statistics.
If 0, will not print any meter (only stats).
"""