Python decimal format

Use the format() function to get decimal format in Python. {0}tells format to print the first argument — in this case, num. Everything after the colon (:) specifies the format_spec..3 sets the precision to 3. g removes insignificant zeros.

'{0:.3g}'.format(num)

Python decimal format example

Simple example topic.

tests=[(1.00, '1'),
       (1.2, '1.2'),
       (1.23, '1.23'),
       (1.234, '1.23'),
       (1.2345, '1.23'),
       (-1.2345, '1.23')]

for num, answer in tests:
    res = '{0:.3g}'.format(num)
    if res != answer:
        print('Error: {0} --> {1} != {2}'.format(num, res, answer))
        exit()
    else:
        print('{0} --> {1}'.format(num,res))

Output:

How to display two decimal points in python, when a number is perfectly divisible?

Answer: The division works and returns adequate precision in results. You can use string formatting for that. For example in Python 3, use f-strings:

The trick does .2f, a string formatting literal or format specifier that represents a floating-point number (f) with two fractional digits after the decimal point (.2).

twoFractionDigits = f"{result:.2f}"

twoFractionDigits = f"{result:.2f}"

Example code

import math

a = 1.175
result = math.floor(a * 100) / 100
print(f"{result:.2f}")

Do comment if you have any doubts or suggestions on this Python decimal topic.

Note: IDE: PyCharm 2021.3.3 (Community Edition)
Windows 10
Python 3.10.1
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.

Python decimal format