How to Format Decimals to Two Decimal Places in Python?

Formatting Decimals with Precision: Achieving Consistent Decimal Places

In the realm of programming, it's often essential to display numeric values with specific precision and formatting. One common task is to ensure that decimal values always display a set number of decimal places, such as two decimal places.

Problem:

Given a decimal value, how can we efficiently format it to always show two decimal places, regardless of its length or whether it currently has any decimal places?

Solution:

Using the modern format specifications in Python, we can define how the decimal value should be represented:

from math import pi

decimal_value = 49
decimal_with_two_places = '{0:.2f}'.format(decimal_value)
print(decimal_with_two_places)  # Output: '49.00'

Alternatively, for Python 3.6 and later, we can leverage literal string interpolation (f-strings):

decimal_with_two_places = f'{decimal_value:.2f}'

This approach allows us to specify ".2f" within the format string to ensure that the value is formatted with two decimal places. The result will always be a string representation of the decimal with the desired precision.

Additional Resources:

• Python String Format Cookbook: https://pyformat.info/

Note:

For the analogous issue with the built-in float type, referred to the discussion on "Limiting floats to two decimal points."

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