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Python String | format() method with Examples

Python String format() method with Examples on capitalize(), center(), count(), encode(), find(), format(), index(), join(), lower(), ljust(), isupper(), istitle(), isspace(), isprintable(), isnumeric(), islower() etc.

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Python String format() Method

Python format() method is used to perform format operations on string. While formatting string a delimiter {} (braces) is used to replace it with the value. This delimeter either can contain index or positional argument.

Signature

format(*args, **kwargs)

Parameters

  • *args : substring
  • **kwargs : start index a range

Return Type

It returns a formatted string.

Let's see some examples to understand the format() method.

Python String format() Method Example 1

An example of simple format method which format string using positional delimiter.

# Python format() function example
# Variable declaration
str = "Java"
str2 = "C#"
# Calling function
str3 = "{} and {} both are programming languages".format(str,str2)
# Displaying result
print(str3)

Output:

Java and C# both are programming languages

Python String format() Method Example 2

The delimiter (braces) are using numerical index to replace and format string.

# Python format() function example
# Variable declaration
str = "Java"
str2 = "C#"
# Calling function
str3 = "{1} and {0} both are programming languages".format(str,str2)
# Displaying result
print(str3)

Output:

C# and Java both are programming languages

Python String format() Method Example 3

Formatting numerical value in different-different number systems. See the below example.

# Python format() function example
# Variable declaration
val = 10
# Calling function
print("decimal: {0:d}".format(val)); # display decimal result
print("hex: {0:x}".format(val));     # display hexadecimal result
print("octal: {0:o}".format(val));   # display octal result
print("binary: {0:b}".format(val));  # display binary result

Output:

decimal: 10
hex: a
octal: 12
binary: 1010

Python String format() Method Example 4

Formating float and percentile in string is pretty easy.

# Python format() function example
# Variable declaration
val = 100000000
# Calling function
print("decimal: {:,}".format(val)); # formatting float value
print("decimal: {:.2%}".format(56/9)); # formatting percentile value

Output:

decimal: 100,000,000
decimal: 622.22%

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