用星号打印图形的三个练习

"""用*号打印三角形"""
for x in range(-10,11):
    print('*' * (10-abs(x)))


"""用*号打印正弦曲线"""
from math import *        # 从数学模块导入所有命令

for x in range(0,180):
    y = int(80 * sin(radians(x))) # radians把弧度值转为角度值
    print('*' * y)



"""用*号打印周期性三角形"""
for x in range(0,60):
    print('*' * (20-abs(x%20)))