Series.str.zfill(width) ” Filling left side of strings in the Series/Index with 0. Equivalent to str.zfill().
| Parameters: |
width : int Minimum width of resulting string; additional characters will be filled with 0 |
|---|---|
| Returns: |
filled : Series/Index of objects |
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http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Series.str.zfill.html