Pad strings in the Series/Index by prepending ‘0’ characters.
Strings in the Series/Index are padded with ‘0’ characters on the left of the string to reach a total string length width. Strings in the Series/Index with length greater or equal to width are unchanged.
Minimum length of resulting string; strings with length less than width be prepended with ‘0’ characters.
- Series/Index of objects.
Fills the left side of strings with an arbitrary character.
Fills the right side of strings with an arbitrary character.
Fills the specified sides of strings with an arbitrary character.
Fills both sides of strings with an arbitrary character.
str.zfill()which has special handling for ‘+’/’-’ in the string.
>>> s = pd.Series(['-1', '1', '1000', 10, np.nan]) >>> s 0 -1 1 1 2 1000 3 10 4 NaN dtype: object
NaNare not strings, therefore they are converted to
NaN. The minus sign in
'-1'is treated as a special character and the zero is added to the right of it (
str.zfill()would have moved it to the left).
1000remains unchanged as it is longer than width.
>>> s.str.zfill(3) 0 -01 1 001 2 1000 3 NaN 4 NaN dtype: object