Python Decimal Module: A Complete Guide

The decimal module in Python offers a precise method for decimal arithmetic calculations to avoid precision issues in floating-point operations. By using the decimal module, Decimal objects can be created to represent decimal numbers and perform precise arithmetic operations such as addition, subtraction, multiplication, and division. Here is a basic usage example of the decimal module:

from decimal import Decimal

# 创建Decimal对象
x = Decimal('10.5')
y = Decimal('3')

# 加法
result = x + y
print(result)  # 输出: 13.5

# 减法
result = x - y
print(result)  # 输出: 7.5

# 乘法
result = x * y
print(result)  # 输出: 31.5

# 除法
result = x / y
print(result)  # 输出: 3.5

Using the decimal module ensures precise decimal calculations and prevents inaccuracies in the calculation results caused by floating-point representation errors.