Python String format() Method

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The Python String format() method is used to is used to format string by replacing placeholders (also known as format specifiers) with corresponding values.

It works in the following way −

• You provide a string with placeholder(s) enclosed in curly braces {}.
• Within the curly braces, you can optionally specify formatting options, such as field width, alignment, and precision.
• You pass the values to be substituted for the placeholders as arguments to the format() method.
• The method replaces each placeholder with the corresponding value and returns the formatted string.

Syntax

Following is the basic syntax of the Python String format() method −

string.format(*args, **kwargs)

Parameters

This method accepts the following parameters −

• args − These are the positional arguments that will be formatted into the string. They can be accessed inside the string using curly braces {} with positional indices.

• kwargs − These are the keyword arguments that will be formatted into the string. They can be accessed inside the string using curly braces {} with keyword names.

Return Value

The method returns a formatted string with the specified arguments replaced with their values. The method itself returns the formatted string, and it does not modify the original string.

Example 1

In the following example, we are formatting a string by replacing placeholders "{}" with the values of variables "name" and "age" −

name = "John"
age = 30
result = "Name: {}, Age: {}".format(name, age)
print(result)  

Output

The output obtained is as follows −

Name: John, Age: 30

Example 2

Here, we use named arguments in the format() method to specify the values corresponding to placeholders "{name}" and "{age}" directly −

result = "Name: {name}, Age: {age}".format(name="Alice", age=25)
print(result)  

Output

Following is the output of the above code −

Name: Alice, Age: 25

Example 3

In the following example, we use index-based formatting to specify the order of replacement. The first placeholder "{1}" is replaced by the second argument "hello", and the second placeholder "{0}" is replaced by the first argument "world −

result = "{1}, {0}".format("world", "hello")
print(result)  

Output

The result produced is as shown below −

hello, world

Example 4

In here, we align the text to the left within a 10-character-wide space using <, and any remaining space is filled with whitespace. Then, we append "is awesome!" to the formatted text −

text = "Python"
result = "{:<10}".format(text)
print(result + "is awesome!") 

Output

We get the output as shown below −

Python    is awesome!