numpy.char.zfill#

char.zfill(a, width)[source]#

Return the numeric string left-filled with zeros. A leading sign prefix (+/-) is handled by inserting the padding after the sign character rather than before.

Parameters:

aarray-like, with StringDType, bytes_, or str_ dtype
widtharray_like, with any integer dtype: Width of string to left-fill elements in a.

Returns:

outndarray: Output array of StringDType, bytes_ or str_ dtype, depending on input type

See also

str.zfill

Examples

>>> import numpy as np
>>> np.strings.zfill(['1', '-1', '+1'], 3)
array(['001', '-01', '+01'], dtype='<U3')