Python判断一个变量是否存在
res1 = 'test' in locals().keys()res2 = 'test' in dir()
res3 = 'test' in vars().keys()
print(res1,res2,res3)# 变量test暂时还没有定义，返回False
test = ""# 定义变量test
res4 = 'test' in locals().keys()
res5 = 'test' in dir()
res6 = 'test' in vars().keys()
print(res4,res5,res6)# 变量test已经被定义了，返回True
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