Series.str.zfill()
pandas.Series.str.zfill
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Series.str.zfill(width)
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” 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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© 2008–2014 the pandas development team
Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Series.str.zfill.html