How to format a string using a dictionary in Python

In this article, we will discuss how to format a string using a dictionary in Python.

Method 1: By using str.format() function

The str.format() function is used to format a specified string using a dictionary.

Syntax: str .format(value)

Parameters: This function accepts a parameter which is illustrated below:

• value: This is the specified value that can be an integer, floating-point numeric constant, string, characters, or even variables.

Return values: This function returns a formatted string using a dictionary.

Example: Formatting a string using a dictionary

Python3

# Python program to illustrate the
# formatting of a string using a dictionary

# Initializing a value
value = {"Company": "GeeksforGeeks",
         "Department": "Computer Science"}

# Calling the .format() function
# over the above given value
print("{Company} is a {Department} Portal.".format(**value))

Output:

GeeksforGeeks is a Computer Science Portal.

Method 2: Using % operator

% – Formatting is a feature provided by Python which can be accessed with a % operator. This is similar to printf style function in C. In this approach, a dictionary is used in which you need to provide the key in the parentheses between the % and the conversion character.  

Example: Formatting a string using a dictionary

Python3

# Python program to illustrate the
# formatting of a string using a dictionary

# String formatting in dictionary
print('%(Company)s is a %(Department)s Portal.'
          %{'Company': "GFG", 'Department': "CS"})

Output:

GFG is a CS Portal.

Method 3: By using f-strings
Python 3.6+ has introduced f-strings support in which keys of a dictionary can be used to format a string. In this approach, you need to place the f prefix before the string and place the key of the dictionary inside the curly braces { }.

Python3

# Python program to illustrate the
# formatting of a string using a dictionary

# Initializing a value
value = {"Company": "GeeksforGeeks",
         "Department": "Computer Science"}

# Using f-strings
print(f"{value['Company']} is a {value['Department']} Portal.")
#This code is contributed by Edula Vinay Kumar Reddy

Output

GeeksforGeeks is a Computer Science Portal.