What is % in Python?

In the Python language, the % Sign (percent) is a fascinating beast. It does string formatting and also functions as a mathematical operator. Python, like other programming languages, has a method for formatting strings. The ‘percent’ sign (also known as the modulus operator) in C and Python, for example, works as a format specifier.

Formatting Strings with Percentage (%)

Try utilizing the % operator if you want to do some rudimentary string formatting. It’s an ancient style that’ll make you think of the C programming language.

Python follows this style as well, and may format values of any data types with the percent sign.

Take a look at the sample below.

% in Python example

The output will be:

% in Python output

It’s worth noting that the kind of data to print must be indicated by prefixing ‘%’ with a type-specific char. It indicates whether a number or a string should be substituted.

% in Python

Python will throw a TypeError if you don’t give an integer type value for the ‘%d’.

The main issue with C printf style formatting is that it restricts the number of arguments that may be given. Furthermore, most programmers do not find Python’s advancements to be as intuitive.

How to Print % in Python

The % sign instructs the Python interpreter to structure a string after the operator using a set of variables packed in a tuple. As an example, consider the following:

How to Print % in Python

The output is:

The second way is to use the symbol’s ASCII value.

Let’s look up the symbol’s ASCII value.

symbol's ASCII value

The output is:

symbol's ASCII value output

chr() is a built-in Python function that converts ascii numbers to their corresponding symbols or characters. The ASCII number 37 denotes the “%” sign.

chr() is a built-in Python function

Troubleshooting ValueError: incomplete format

The ValueError: incomplete format error occurs when a string contains a $ symbol but no format specifier characters after it.

The string format specifier is used to substitute the value in the string dynamically. The formats are specified using % in the string. If a string contains a percent symbol but no format specifier character, the Python interpreter raises a “ValueError: incomplete format” error.

A character is anticipated to appear after the % in the string in Python to tell it how to display the variable in the string. If the character after the % sign in the string is not detected, the “ValueError: incomplete format” error is returned.


If a character is not detected after the % symbol, the “ValueError: incomplete format” error will appear as seen below.

ValueError: incomplete format

The Source of The Problem

In python strings, the % sign is used to define the formatter. The character after the % denotes how the value in the string should be represented. The format specifier character is absent after the % sign, which causes this problem.

What Can Be Done to Resolve the Problems?

Solution 1:

The format specifier in the Python string is represented by the percentage symbol. Remove the % sign from the string if it isn’t needed there. The “ValueError: incomplete format” error will be resolved as a result of this.

"ValueError: incomplete format" error

The following will be the solution to the problem:

"ValueError: incomplete format" error

Solution 2:

The format specifier in the Python string is represented by the percentage symbol. To instruct it on how to interpret the variable in the string, the character is anticipated to accompany the % in the string. Add the character just after % sign if it is absent from the string.

format specifier in the Python string

The problem will be solved as follows:

format specifier in the Python string

More Than One % Signs

The %s operator can also be used to add many strings to a single string. Wherever there is a %s sign, the strings are substituted in the order that they appear in the brackets. The following bit of code demonstrates this:

%s operator

The output will be:

%s operator

In Python, How Do You Calculate a Percentage?

Although Python lacks a percentage operator for calculating percentages, it still won’t stop you from creating yours.

To compute a percentage in Python, first find the quotient from two values by using division operator (/), then multiply that quotient by 100 using the multiplication operator (*). To calculate the percentage, use this easy arithmetic equation.

Calculate Percentage Python

The output will be:

Based on the result, the percentage is 62.5%

Method 2:

You may also determine the percentage using a personalized Python function.

Calculate a Percentage in python example

The output will be:

Method 3:

You might want to include an if condition. This will result in an exception being thrown.

Calculate a Percentage in python example

The output will be:

Python % sign(Modulo Operator)

The % sign is termed the modulo operator in Python, and it returns the fraction upon dividing the left and right operands.

Python % sign(Modulo Operator)

The output will be:

Python % sign (Modulo Operator) output

After splitting the two numbers, the modulo operator “%” returns the fraction. You can add value to a Python string with the %s operator. The %s denotes that you wish to insert a string value into the string; it can also be used to format numbers.

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