How to Format Floating-Point Numbers Precisely Using f-Strings in Python?

Formatting Floating-Point Numbers Precisely with f-Strings

Python's f-strings provide a convenient way to format strings dynamically. However, when working with floating-point numbers, specifying the desired number of decimal places can be challenging. This article explores an efficient method to control the number of digits displayed after the decimal point using f-strings.

Problem:

Consider the following task: display a floating-point number, such as 10.1234, with only two digits after the decimal point. Traditional string formatting options like .format or % exist, but how can we achieve this precision using f-strings?

Solution:

The key to controlling the number of decimal places lies in the format expression included within the f-string. To specify the desired precision, we append a type specifier to the expression: .2f. This indicates that we want to display the value as a floating-point number with two decimal places.

For example, given the variable a = 10.1234:

>>> f'{a:.2f}'

This expression will output the string '10.12', effectively truncating the number to two decimal places. By adjusting the value after the colon (2 in this case), you can specify any desired number of decimal digits.

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