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Python String format() Method

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How to use String Formatters in Python

Last Updated :15 Jul, 2025

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In Python, we use string formatting to control how text is displayed. It allows us to insert values intostrings and organize the output in a clear and readable way. In this article, we’ll explore different methods of formatting strings in Python to make our code more structured and user-friendly.

Using f-string

f-strings are the simplest and most efficient way to format strings. They allow expressions to be evaluated at runtime and are preceded by "f" or "F".

Example:

Python

# to display name and agename="shakshi"age=21print(f"Name:{name}, Age:{age}")# to display the sum of a and ba=5b=3print(f"sum of{a} and{b} is{a+b}")

Output

Name: shakshi, Age: 21sum of 5 and 3 is 8

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Using format()

format() is one of the methods in string class which allows the substitution of the placeholders with the values to be formatted.

Example:

Python

name="shakshi"age=21# Using positional argumentsprint("Name:{0}, Age:{1}".format(name,age))# Using keyword argumentsprint("Name:{name}, Age:{age}".format(name="shakshi",age=21))

Output

Name: shakshi, Age: 21Name: shakshi, Age: 21

Explanation:

Positional Arguments:This inserts values in order using placeholders {}.
Keyword Arguments:This uses named parameters for clarity and flexibility in value assignment.

Using format specifier (% )

% operator for string formatting is the oldest method in Python and is similar to C-style string formatting. It’s still widely used but is less efficient compared to f-strings andformat().

Most common format specifiers

Format specifier	Description
%s	Specifies the String
%c	Specifies a single character
%d	Specifies the integer
%f	Specifies the float. Any number of digits can be present after decimal point
%<space>.<number>f	Specifies the float. <space> denotes the number of space to append before printing the number. <number> denotes the number of digits to be present after the decimal point.
%x / %X	Specifies the hexadecimal representation of the value
%o	Specifies the octal representation of a value
%e / %E	Specifies the floating numbers in exponential format
%g / %G	Similar to %e/%E. Specifies the exponential format only if the exponent is greater than -4

Example:

Python

a="This is a string"print("String is%s"%(a))# single characterb='a'print("Single character is%c"%(b))# integerc=45print("number is%d"%(c))# float without specified precisiond=34.521094print("float is%f"%(d))

Output

String is This is a stringSingle character is anumber is 45float is 34.521094

Using print()

print() function in Python displays messages and outputs, converting non-string objects to strings. It also allows formatting with parameters likesep, which defines a separator between printed elements.

Example:

Python

name="shakshi"age=21print("Name: "+name+", Age: "+str(age))

Output

Name: shakshi, Age: 21

Python String format() Method

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