The Python Coding Stack
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I Want My Own Fancy F-String Format Specifiers… Sure You Can
March 19, 2025 - *l} displays an initial for the first name followed by a dot and a space, and then the full last name: M. Johnson · So, how does Python know what to do with format specifiers? Indeed, how does it know how to perform any core operation with objects? ... Note: It's probably easier to create instance methods to control these bespoke string displays.
Python
peps.python.org › pep-0498
PEP 498 – Literal String Interpolation | peps.python.org
The allowed conversions are '!s', '!r', or '!a'. These are treated the same as in str.format(): '!s' calls str() on the expression, '!r' calls repr() on the expression, and '!a' calls ascii() on the expression. These conversions are applied before the call to format(). The only reason to use '!s' is if you want to specify a format specifier that applies to str, not to the type of the expression. F-strings use the same format specifier mini-language as str.format.
python - f-string, multiple format specifiers - Stack Overflow
Is it possible to use multiple format specifiers in a Python f-string? For example, let's say we want to round up numbers to two decimal points and also specify a width for print. Individually it l... More on stackoverflow.com
is there any difference between using string.format() or an fstring?
Don't forget that f-strings haven't been around forever. It may be partly old habits, it may be not keeping up to date with features, they may still be wanting to target a minimum python version that didn't support f-strings. I'd tend to prefer to use f-strings, but I wouldn't crucify someone for using perfectly valid language constructs. More on reddit.com
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October 9, 2022Does anyone have a concise cheat sheet for f string formatting with numbers
Here's what I have as a reference. Basically a summary of the Format Specification Mini-Language . This would all go after a : in the f-string curly braces. So if you want a float with 2 decimal place precision, with * as fill and right aligned in a field width of 10 characters you'd do f"{val:*>10.2f}" [[fill]align][sign][#][0][minimumwidth][.precision][type] Fill: Add a character to fill with. Must be followed by Align flag. Align: '<' - Forces the field to be left-aligned within the available space (This is the default.) '>' - Forces the field to be right-aligned within the available space. '=' - Forces the padding to be placed after the sign (if any) but before the digits. This is used for printing fields in the form '+000000120'. This alignment option is only valid for numeric types. '^' - Forces the field to be centered within the available space. Sign: '+' - indicates that a sign should be used for both positive as well as negative numbers '-' - indicates that a sign should be used only for negative numbers (this is the default behavior) ' ' - indicates that a leading space should be used on positive numbers #: Flags alternate numbering formats; binary, octal, and hexadecimal output will be prefixed with '0b', '0o', and '0x', respectively. 0: Zero-padding. Equivalent to fill '=' and character of '0' Minimumwidth: Min width of the field. Precision: Decimal places for floats or max field size for non-numeric types. Type: Integers: 'b' - Binary. Outputs the number in base 2. 'c' - Character. Converts the integer to the corresponding Unicode character before printing. 'd' - Decimal Integer. Outputs the number in base 10. 'o' - Octal format. Outputs the number in base 8. 'x' - Hex format. Outputs the number in base 16, using lower- case letters for the digits above 9. 'X' - Hex format. Outputs the number in base 16, using upper- case letters for the digits above 9. 'n' - Number. This is the same as 'd', except that it uses the current locale setting to insert the appropriate number separator characters. '' (None) - the same as 'd' Floats: 'e' - Exponent notation. Prints the number in scientific notation using the letter 'e' to indicate the exponent. 'E' - Exponent notation. Same as 'e' except it converts the number to uppercase. 'f' - Fixed point. Displays the number as a fixed-point number. 'F' - Fixed point. Same as 'f' except it converts the number to uppercase. 'g' - General format. This prints the number as a fixed-point number, unless the number is too large, in which case it switches to 'e' exponent notation. 'G' - General format. Same as 'g' except switches to 'E' if the number gets to large. 'n' - Number. This is the same as 'g', except that it uses the current locale setting to insert the appropriate number separator characters. '%' - Percentage. Multiplies the number by 100 and displays in fixed ('f') format, followed by a percent sign. '' (None) - similar to 'g', except that it prints at least one digit after the decimal point. More on reddit.com
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February 2, 2022Do you normally use string.format() or percentage (%) to format your Python strings?
Firstly, you can write e. g. {0:.2f} to specify a float with 2 decimals, see e. g. https://www.digitalocean.com/community/tutorials/how-to-use-string-formatters-in-python-3
Secondly, the best formatting method is f-strings, see e. g. https://www.blog.pythonlibrary.org/2018/03/13/python-3-an-intro-to-f-strings/
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June 3, 2018Videos
04:25
Python: String Formatting | str.format() | f strings and more...
Python f-Strings - Advanced String Formatting tutorial for beginners ...
05:21
Learn Python format specifiers in 5 minutes! 💬 - YouTube
Python - String Formatting using F-String Tutorial with Examples
03:19
Python f-String Formatting with Examples - Learn Python Programming ...
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Python Quick Tip: F-Strings - How to Use Them and Advanced String ...
Real Python
realpython.com › python-f-strings
Python's F-String for String Interpolation and Formatting – Real Python
November 30, 2024 - They also support the string formatting mini-language, so you can create format specifiers to format the objects that you want to insert into your strings. In the following sections, you’ll learn about a few additional features of f-strings that may be relevant and useful in your day-to-day coding. Python’s f-strings support two flags with special meaning in the interpolation process.
Python Morsels
pythonmorsels.com › string-formatting
Python f-string tips & cheat sheets - Python Morsels
April 12, 2022 - It's nifty that we can customize the format of strings and numbers within an f-string. But what about other types? What else supports format specifiers? Python's datetime.datetime class (along with datetime.date and datetime.time) supports string formatting which uses the same syntax as the strftime method on these objects.
Real Python
realpython.com › how-to-python-f-string-format-float
How to Format Floats Within F-Strings in Python – Real Python
April 24, 2024 - In this tutorial, you'll learn how to use Python format specifiers within an f-string to allow you to neatly format a float to your required precision.
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.
ZetCode
zetcode.com › python › fstring
Python f-string - formatting strings in Python with f-string
May 11, 2025 - The .2f specifier in {c:.2f} applies to both the real and imaginary parts of the complex number. You can also access and format the .real and .imag attributes individually for more granular control. $ python main.py Default: (3.14159+2.71828j) Precision: (3.14+2.72j) Real: 3.142, Imaginary: 2.718j · F-strings can be nested, meaning an f-string can be part of an expression inside another f-string.
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 :.2f inside the curly braces ... f-strings use a straightforward syntax. To create an f-string, prefix a string literal with f and include any Python expression inside curly braces ({ and }):...
EyeHunts
tutorial.eyehunts.com › home › python f-string format specifier
Python f-string format specifier - Tutorial - By EyeHunts
June 10, 2024 - Python f-string format specifier has an f prefix and uses {} brackets to evaluate values. Where Format specifiers for types, padding, or alig
Top answer 1 of 4
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You want
for v in values: print(f'{v:<10.2} value')
Detailed rules can be found in Format String Syntax:
The general form of a standard format specifier is:
format_spec ::= [[fill]align][sign][#][0][width][grouping_option][.precision][type]
For your case, you want the [align] and [.precision].
2 of 4
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Dependent on the result you want, you can combine them normally such as;
for v in values: print(f"{v:<10.2} value")
#1.2e+01 value
#1.4e+01 value
However, your result does not seem like the result you're looking for.
To force the fixed notation of the 2 you need to add f:
for v in values: print(f"{v:<10.2f} value")
#12.11 value
#13.95 value
You can read more on format specifications here.
iO Flood
ioflood.com › blog › python-f-string
Python f-string | Usage Guide (With Examples)
December 11, 2023 - In the above example, we’ve used the format specifier :.2f inside the curly braces {}. This tells Python to format the float pi to 2 decimal places. As you can see, Python’s f-string formatting is a versatile tool that can handle a wide range of scenarios, making your code more efficient and easier to read.
OpenPython
openpython.org › home › articles › python f-strings and string formatting: the complete guide
Python f-strings and String Formatting: The Complete Guide | OpenPython
3 weeks ago - This example demonstrates dynamic format specifiers ({width_name} inside braces), thousands separators, alignment, and combining int/float formats. This section digs into the internals, edge cases, and why f-strings behave the way they do. ... At the language level, f-strings are a syntactic construct. The Python parser recognizes an f-string literal and parses the braces and format specifiers at compile-time...
Analytics Vidhya
analyticsvidhya.com › home › mastering f-strings in python: the ultimate guide to string formatting
Mastering f-strings in Python: The Ultimate Guide to String Formatting
March 13, 2024 - F-strings support various Python formatting String options to customize the output. Let’s explore some of these options: We can specify the field width and alignment of the interpolated values using the colon ‘:’ followed by the format specifier.
Bentley
cissandbox.bentley.edu › sandbox › wp-content › uploads › 2022-02-10-Documentation-on-f-strings-Updated.pdf pdf
A Guide to Formatting with f-strings in Python - CIS Sandbox
The procedure is as follows: • ... placing a colon (:) after the variable · • Formatting the variable using a format specification (width, alignment, data type) after...
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.
Linuxize
linuxize.com › home › python › python f-strings: string formatting in python 3
Python f-Strings: String Formatting in Python 3 | Linuxize
March 14, 2026 - What is the difference between f-strings and str.format()? f-strings are evaluated at runtime and embed expressions inline. str.format() uses positional or keyword placeholders and is slightly more verbose. f-strings are generally faster and ...
GeeksforGeeks
geeksforgeeks.org › python › string-formatting-in-python
String Formatting in Python - GeeksforGeeks
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 March 18, 2026
OneUptime
oneuptime.com › home › blog › how to use f-strings for string formatting in python
How to Use f-strings for String Formatting in Python
January 25, 2026 - The = specifier shows both the expression and its value: x = 10 y = 20 # Self-documenting expressions print(f"{x=}") # x=10 print(f"{y=}") # y=20 print(f"{x + y=}") # x + y=30 # Works with formatting print(f"{x=:05d}") # x=00010 # Great for debugging name = "Alice" print(f"{name.upper()=}") # name.upper()='ALICE' # Escape braces by doubling them print(f"{{curly braces}}") # {curly braces} # Backslashes in f-strings (use variables for Python 3.6-3.11 compatibility) newline = "\n" print(f"Line1{newline}Line2") # For complex expressions, use a variable path = "C:\\Users\\name" print(f"Path: {path}") # Path: C:\Users\name
DataCamp
datacamp.com › tutorial › python-f-string
Python f-string: A Complete Guide | DataCamp
December 3, 2024 - You can use most Python expressions inside f-strings, including variables, function calls, and calculations, but you cannot use statements like assignments or multi-line expressions. You can control decimal places by using format specifiers after a colon, such as {number:.2f} to display a number with exactly two decimal places.