str.zfill(width)
Return a copy of the string left filled with ASCII '0' digits to make a string of length width. A leading sign prefix ('+'/'-') is handled by inserting the padding after the sign character rather than before. The original string is returned if width is less than or equal to len(s).
For example:
>>> "42".zfill(5) '00042' >>> "-42".zfill(5) '-0042'
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