Python计算：sympy解数学方程

solve(f, *symbols, **flags)

# -*- coding: utf-8 -*-
# @File    : sympy_demo.py
# @Date    : 2018-08-15
# @Author  : Peng Shiyu
from sympy import solve
from sympy.abc import x, y
# 一元一次方程
# 3x=9
print(solve(x * 3 - 9, x))
# [3]
# 一元二次方程
# x^2=9
print(solve(x ** 2 - 9, x))
# [-3, 3]
# 二元一次方程组
"""
x + y = 5
x - y = 1
"""
print(solve([x + y - 5, x - y - 1], [x, y]))
# {x: 3, y: 2}