Python
docs.python.org › 3 › library › string.html
Common string operations — Python 3.14.6 documentation
Because arg_name is not quote-delimited, it is not possible to specify arbitrary dictionary keys (e.g., the strings '10' or ':-]') within a format string. The arg_name can be followed by any number of index or attribute expressions. An expression of the form '.name' selects the named attribute using getattr(), while an expression of the form '[index]' does an index lookup using __getitem__(). Changed in version 3.1: The positional argument specifiers can be omitted for str.format(), so '{} {}'.format(a, b) is equivalent to '{0} {1}'.format(a, b).
Real Python
realpython.com › python-formatted-output
A Guide to Modern Python String Formatting Tools – Real Python
February 1, 2025 - You can use variables in Python’s .format() method by placing them inside curly braces and passing them as arguments. Format specifiers in Python control how values appear when formatted, using components like fill, align, sign, width, and type.
Videos
How to use Format Specifiers with F-String in Python - YouTube
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Learn Python
learnpython.org › en › String_Formatting
String Formatting - Learn Python - Free Interactive Python Tutorial
Here are some basic argument specifiers you should know: %s - String (or any object with a string representation, like numbers) ... %.<number of digits>f - Floating point numbers with a fixed amount of digits to the right of the dot.
Python
peps.python.org › pep-3101
PEP 3101 – Advanced String Formatting | peps.python.org
Brace characters (‘curly braces’) are used to indicate a replacement field within the string: ... The element within the braces is called a ‘field’. Fields consist of a ‘field name’, which can either be simple or compound, and an optional ‘format specifier’.
GeeksforGeeks
geeksforgeeks.org › python › string-formatting-in-python
String Formatting in Python - GeeksforGeeks
In this code, the string 'The value of pi is: %5.4f' contains a format specifier %5.4f. The %5.4f format specifier is used to format a floating-point number with a minimum width of 5 and a precision of 4 decimal places. ... In the given code, the formatting string Python is converted to Integer ...
Published March 18, 2026
Real Python
realpython.com › python-string-formatting
Python String Formatting: Available Tools and Their Features – Real Python
December 2, 2024 - In this example, note that each replacement field contains a string that starts with a colon. That’s a format specifier. The .2f part tells Python that you want to format the value as a floating-point number (f) with two decimal places (.2).
The Python Coding Stack
thepythoncodingstack.com › the python coding stack › i want my own fancy f-string format specifiers… sure you can
I Want My Own Fancy F-String Format Specifiers… Sure You Can
March 19, 2025 - If the format specifier is the empty string, which is falsy, then .__format__() returns the str() representation: ... Now, back to ClubMember. Do you want to join a forum to discuss Python further with other Pythonistas? Upgrade to a paid subscription here on The Python Coding Stack to get exclusive access to The Python Coding Place's members' forum.
GeeksforGeeks
geeksforgeeks.org › string-formatting-in-python
Python String Formatting - How to format String? - GeeksforGeeks
In this code, the string 'The value of pi is: %5.4f' contains a format specifier %5.4f. The %5.4f format specifier is used to format a floating-point number with a minimum width of 5 and a precision of 4 decimal places. ... In the given code, the formatting string Python is converted to Integer and floating point with %d,%f.
Published August 21, 2024
W3Schools
w3schools.com › python › ref_string_format.asp
Python String format() Method
Remove List Duplicates Reverse ... Q&A Python Bootcamp Python Training ... The format() method formats the specified value(s) and insert them inside the string's placeholder....
Codesolid
codesolid.com › python-format-strings
Python Format Strings: Beginner to Expert — CodeSolid.com 0.1 documentation
The f-string is a bit harder to read. Still, it’s simply the expression, a colon to indicate a format specifier is about to show up, and the specifier itself: .2f, which in effect tells Python, “format it as a fixed-point number with two digits of decimal precision, please.”
Mimo
mimo.org › glossary › python › formatted-strings
Python Formatted Strings / f-string formatting Guide
The % operator is Python's original method for string formatting, inspired by the printf syntax of the C programming language. The % operator method uses format specifiers like %s for strings and %d for integers to insert values into a string template.
Python Cheat Sheet
pythoncheatsheet.org › home › string formatting
Python String Formatting - Python Cheat Sheet
For new code, using str.format, or formatted string literals (Python 3.6+) over the % operator is strongly recommended. # % operator: old-style string formatting (not recommended for new code) name = 'Pete' 'Hello %s' % name # %s = string placeholder · "Hello Pete" We can use the %d format specifier to convert an int value to a string: num = 5 'I have %d apples' % num ·
OpenStax
openstax.org › books › introduction-python-programming › pages › 3-2-formatted-strings
3.2 Formatted strings - Introduction to Python Programming | OpenStax
March 13, 2024 - Ex: In the string f"{hour}:{minute:02d}", the format specifier for minute is 02d. Table 3.3 Example format specifiers. The table shows common ways that numbers can be formatted. Many more formatting options are available and described in Python's Format Specification Mini-Language.
Kutztown
kuvapcsitrd01.kutztown.edu › ~schwesin › fall20 › csc223 › lectures › Python_String_Formatting.html
Python String Formatting
Format specifiers enable greater control over formatted values · Syntax (all are optional): {:[1][2][3][4][5][6][7][8]} ... >>> '{:^11}'.format('hello') ' hello ' >>> '{:>11}'.format('hello') ' hello' >>> '{:*>11}'.format('hello') '******hello' >>> '{:-^11}'.format('hello') '---hello---'
PyFormat
pyformat.info
PyFormat: Using % and .format() for great good!
The number behind a . in the format specifies the precision of the output. For strings that means that the output is truncated to the specified length.
Top answer 1 of 3
3
You could either implement the __format__ method in your object class or place the str() directly in the format string:
print(f"{str(obj):.5}")
see PEP 498 for details.
note that f"{obj!s:.5}" also works but, in that same specification, !s and !r are considered redundant and only maintained for backward compatibility
2 of 3
1
It works if you explicitly request string conversion:
>>> print(f"{obj!s:.5}")
<obje
Behind the scenes, I suspect that the result of the expression is not passed to str first, but rather to format:
>>> format(obj, "%s")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported format string passed to object.__format__
In this case, object.__format__ itself doesn't automatically do a conversion to string using object.__str__, for whatever reason.
Programiz
programiz.com › python-programming › methods › string › format
Python String format()
Likewise, in the second example, 123.236 is the positional argument and, align, width and precision are passed to the template string as format codes. format() also supports type-specific formatting options like datetime's and complex number formatting.
Python Morsels
pythonmorsels.com › string-formatting
Python f-string tips & cheat sheets - Python Morsels
April 12, 2022 - Below are the most useful string format specifications for numbers. You can test some of these out from your browser here. The .Nf format specifier (where N is a whole number) will format a number to show N digits after the decimal point. This is called fixed-point notation (yet another term you don't need to remember). ... This fixed-point notation format specification rounds the number the same way Python's round function would.
Scaler
scaler.com › home › topics › python › string formatting in python
String Formatting in Python - Scaler Topics
June 11, 2024 - Following is a table of the most commonly used format specifiers for different types of input variables. To format a string in Python using format specifiers, We put the format specifier in the predefined string at the position where the variable is to be inserted.
Python
docs.python.org › 3.4 › library › string.html
6.1. string — Common string operations — Python 3.4.10 documentation
Because arg_name is not quote-delimited, it is not possible to specify arbitrary dictionary keys (e.g., the strings '10' or ':-]') within a format string. The arg_name can be followed by any number of index or attribute expressions. An expression of the form '.name' selects the named attribute using getattr(), while an expression of the form '[index]' does an index lookup using __getitem__(). Changed in version 3.1: The positional argument specifiers can be omitted, so '{} {}' is equivalent to '{0} {1}'.