how to get decimal number in python code example

Example 1: decimal in python

>>> from decimal import *
>>> getcontext().prec = 6
>>> Decimal(1) / Decimal(7)
Decimal('0.142857')
>>> getcontext().prec = 28
>>> Decimal(1) / Decimal(7)
Decimal('0.1428571428571428571428571429')

Example 2: what should you call a decimal value in python

x = 13.949999999999999999
g = float("{:.2f}".format(x))