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.
Answer from Manoel Vilela on Stack OverflowCodecademy
codecademy.com › docs › python › strings › .zfill()
Python | Strings | .zfill() | Codecademy
November 19, 2023 - Returns a string with zeros padding the left side based on the integer given.
Programiz
programiz.com › python-programming › methods › string › zfill
Python String zfill()
zfill() returns a copy of the string with 0 filled to the left.
Tutorialspoint
tutorialspoint.com › python › string_zfill.htm
Python String zfill() Method
The Python String zfill() method is used to fill the string with zeroes on its left until it reaches a certain width; else called Padding. If the prefix of this string is a sign character (+ or -), the zeroes are added after the sign character
Top answer 1 of 4
62
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.
2 of 4
56
See Format Specification Mini-Language:
In [1]: '{:<08d}'.format(190)
Out[1]: '19000000'
In [2]: '{:>08d}'.format(190)
Out[2]: '00000190'
This also works with the Formatted String Literals, or f-strings for short (New in version 3.6):
In [1]: f'{190:<08d}'
Out[1]: '19000000'
In [2]: f'{190:>08d}'
Out[2]: '00000190'
Note.nkmk.me
note.nkmk.me › home › python
Pad Strings and Numbers with Zeros in Python (Zero-padding) | note.nkmk.me
May 18, 2023 - ... Specify the length of the returned string. The original string will be right-justified, and the left side will be filled with zeros. s = '1234' print(s.zfill(8)) # 00001234 print(type(s.zfill(8))) # <class 'str'>
W3Schools
w3schools.com › python › ref_string_zfill.asp
Python String zfill() Method
Python Examples Python Compiler ... Q&A Python Training ... The zfill() method adds zeros (0) at the beginning of the string, until it reaches the specified length....
datagy
datagy.io › home › python posts › python strings › python zfill & rjust: pad a string in python
Python zfill & rjust: Pad a String in Python • datagy
December 16, 2022 - The Python zfill method is a string method that returns a copy of the string left filled with the '0' character to make a character the length of a given width.
Python Reference
python-reference.readthedocs.io › en › latest › docs › str › zfill.html
zfill — Python Reference (The Right Way) 0.1 documentation
Returns the numeric string left filled with zeros in a string of specified length. ... Required. Width of the padding field. ... A sign prefix is handled correctly. The original string is returned if width is less than or equal to len(str). >>> '350'.zfill(1) '350' >>> '350'.zfill(2) '350' ...
Pandas
pandas.pydata.org › docs › reference › api › pandas.Series.str.zfill.html
pandas.Series.str.zfill — pandas 3.0.5 documentation - PyData |
Strings in the Series/Index are padded with ‘0’ characters on the left of the string to reach a total string length width.
Toppr
toppr.com › guides › python-guide › references › methods-and-functions › methods › string › zfill › python-string-zfill
Python zfill() function | Why do we use Python String zfill() function? |
September 27, 2021 - The Python zfill() function is a string method that returns a copy of the string by padding 0s to the left of the input string. Python zfill() is a built-in string method that pads the‘ 0’ character to the left of the input string and returns it.
Initial Commit
initialcommit.com › blog › python-zfill-method
Python zfill Method
November 1, 2021 - zfill() is a built-in string method in Python that is used for padding zeros to the left side of the string.
Python Pool
pythonpool.com › home › tutorials › python zfill(): zero-pad strings, numbers, and signs
Python zfill(): Zero-Pad Strings, Numbers, and Signs
July 13, 2026 - In short, use zfill() when you already have text and need left zero padding.
AskPython
askpython.com › python › string › python-string-zfill
Python string zfill() - AskPython
August 6, 2022 - The Python string zfill() function belongs to the String class, and can only be used on string objects. This takes in width as a parameter, and pads zeros on a string’s left (start of the string) till the specified width is reached.
GeeksforGeeks
geeksforgeeks.org › python › python-string-zfill
Python String zfill() - GeeksforGeeks
January 2, 2025 - zfill() method in Python is used to pad a string with zeros (0) on the left until it reaches a specified width.
iO Flood
ioflood.com › blog › python-zfill
Python's 'zfill()' Method | Guide To Padding Numeric Strings
February 14, 2024 - Python’s zfill method is a string method that pads numeric strings on the left with zeros until they reach a desired length.
Learn By Example
learnbyexample.org › python-string-zfill-method
Python String zfill() Method - Learn By Example
April 20, 2020 - The zfill() method returns a copy of string left padded with ‘0’ characters to make a string of length width.
Python Engineer
python-engineer.com › posts › pad-zeros-string
How to pad zeros to a String in Python - Python Engineer
... It also shows how numbers can be converted to a formatted String with leading zeros. zfill is the best method to pad zeros from the left side as it can also handle a leading '+' or '-' sign.
Javatpoint
javatpoint.com › python-string-zfill-method
Python String | zfill() method with Examples - Javatpoint
We are excited to announce that we are moving from JavaTpoint.com to TpointTech.com on 10th Feb 2025. Stay tuned for an enhanced experience with the same great content and even more features. Thank you for your continued support · Python zfill() method fills the string at left with 0 digit ...
DataScience Made Simple
datasciencemadesimple.com › home › zfill() function in python
zfill() Function in Python - DataScience Made Simple
September 22, 2020 - zfill() Function in Python pads string on the left with zeros to the required width.
Scaler
scaler.com › home › topics › zfill() in python | python string zfill() method
zfill() in Python | Python String zfill() Method - Scaler Topics
March 15, 2022 - The zfill() method in Python Programming returns a String by adding zeros (0) to the left of the string to reach the specified length that is mentioned in its parameters.