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Python strings have a method called zfill that allows to pad a numeric string with zeros to the left.
In : str(190).zfill(8)
Out: '00000190'
How can I make the pad to be on the right ?
586
The zfill() method adds zeros (0) at the beginning of the string, until it reaches the specified length. If the value of the len parameter is less than the length of the string, no filling is done.
Python string method rjust() returns the string right justified in a string of length width. Padding is done using the specified fillchar (default is a space).
Use str. zfill(width) zfill is the best method to pad zeros from the left side as it can also handle a leading '+' or '-' sign. It returns a copy of the string left filled with '0' digits to make a string of length width.
To pad an integer with leading zeros to a specific length To display the integer as a decimal value, call its ToString(String) method, and pass the string "Dn" as the value of the format parameter, where n represents the minimum length of the string.
See Format Specification Mini-Language:
In [1]: '{:<08d}'.format(190)
Out[1]: '19000000'
In [2]: '{:>08d}'.format(190)
Out[2]: '00000190'
As maybe a alternative more portable [1] and efficient [2], actually you can just use str.ljust.
In [2]: '190'.ljust(8, '0')
Out[2]: '19000000'
In [3]: str.ljust?
Docstring:
S.ljust(width[, fillchar]) -> str
Return S left-justified in a Unicode string of length width. Padding is
done using the specified fill character (default is a space).
Type: method_descriptor
[1] format is not present on old python versions. format specifier was added since Python 3.0 (see PEP 3101) and Python 2.6.
[2] reverse twice is an expensive operation.
41
Hint: The string can be inverted twice: before and after using the zfill method:
In : acc = '991000'
In : acc[::-1].zfill(9)[::-1]
Out: '991000000'
Or even more easier:
In : acc.ljust(9, '0')
Out: '991000000'
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