1 #-*- coding : utf-8 -*- 2 import math 3 4 def move(x, y, step, angle=0): 5 nx = x + step * math.cos(angle) 6 ny = y - step * math.sin(angle) 7 return nx, ny
新建Python文件，保存为move，Python交互界面，导入move函数后，执行函数，报错
后在执行函数前，输入
import math
执行函数，不报错
Python，报错NameError: name 'math' is not defined
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