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Python %s - String Formatting

In this tutorial, we will learn about how we can implement and use %s in our Python program. We will also learn the uses of %s in the strings.

%s in a string format in Python

Basically, the % symbol is used with a large variety of data having many data types and configurations in Python.

Talking about %s, it is specifically used to perform concatenation of two or more strings together in Python. The %s allow us to format or place a string or numerical value within a given string. In simple language, the %s in Python is used to incorporate a given string within another string. This operator automatically provides type conversion of a given value to string data type.

We put the % operator, where we have to specify the string. The numbers of values that we want to append into the given string should be equal to the numbers of %s operators that have been specified in the parentheses between the strings.

The following Python code will explain the way by which we perform string formatting using %s operator:

Example -


Hello Python developers! Welcome to, JavaTpoint!

As we can see in the above code, we have declared a string variable, i.e., str, and appended it inside the given string in parenthesis. We appended the str string value using the %s operator.

Uses of %s operator in Python

In this section, we will discuss the highlighted uses of the %s operator. We will also learn the implementation of the %s operator by multiple approaches and how it is helpful to us.

We will discuss the following approaches of implementing %s:

  1. Multiple %s in a string
  2. Using %s for mapping string
  3. Using %s for a list as a string
  4. Order Dictionary with %s

1. Multiple %s in a string:

We can use the %s operator to append the given string variable inside a string by putting it where we want to add the value. Python will simply add the string variables where we have used the %s operator in the string. Let's go through an example to understand it.

Example: Look at the following code:


Hello Python developers, Welcome to the JavaTpoint! We hope you are having a good day.

Explanation -

We have appended multiple string variables (mkr1, mkr2, mkr3) inside a single string and printed the string. We have appended these variables by simply using the %s operator multiple times within the string.

2. Using %s for mapping string:

We can also use the %s operator for mapping the string within the given program. We can map multiple string variables into a single string by simply using %s operators multiple times. However, when we want to add multiple string variables in a single string, we have to match the number of occurrences of %s in the string with the number of strings to replace it. We have to add that number of strings after the % operator.

Example: 1


Resultant mapped string using '%s' operator:
Hey Python Developers Welcome to JavaTpoint

Note: But, if we don't give the same number of string variables after % operator, as the %s operator we have used, then the code will through a TypeError in the output like the following program:

Example - 2


Traceback (most recent call last):
  File "C:\Users\Manish\Downloads\", line 9, in 
    ResultantStr = "%s %s %s %s %s %s" % (mkr1, mkr2, mkr4, mkr5, mkr6)
TypeError: not enough arguments for format string

3. Using %s for a list as a string:

With the help of the %s operator, we can also map a given list data type variable with the string variables to form a single string. We have to follow the same set of instructions that we follow while mapping string variables. Let's go through an example to understand it.



Resultant mapped string with list variable in it:
Hey Python Developers Welcome to JavaTpoint, ['Java', 'Python', 'C++', 'HTML', 'JavaScript']

4. Order dictionary with %s:

We can define multiple string variables inside a dictionary data type variable. Then, we can call out these string variables by the order we want to, just by using the %s operator with the string variable name.



Resultant mapped string with ordered variable from dictionary: 
Learning %s operator concept at JavaTpoint

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