python 打印函数图像

效果图

代码，运行环境windows

# 让控制台使用 UTF-8 编码
import os; os.system("chcp 65001 & cls")

import math
import random
def plot(f):
    print("="*89)
    print("现在打印的是", f, "的函数图象")
    
    # 打印范围 x 为正负 20
    w = int(40 / 2)
    # 生成点集
    arrPos = [[x, round(f(x))] for x in range(-w, w+1)]
    
    # 生成y坐标集
    rangelist = [x[1] for x in arrPos]

    for y in range(max(rangelist), min(rangelist)-1,-1):
         print("".join([(
             ([x, y] in arrPos and y == 0 and "-*") or
             [x, y] in arrPos and " *" or
             x == 0 and y == 0 and "-|" or
             x == 0 and " |" or
             y == 0 and "--" or
             "  "
         ) for x in range(-w,w)]))




plot(lambda x: 
    ((15**2) - x ** 2 >= 0) and math.sqrt((15**2) - x ** 2) * random.choice([1,-1])
)
input()