How do I check whether a variable is declared in Python?
Question
如何不使用try ， except语句检查是否声明了变量？
1 answers
solution1
4 ACCPTED 2017-11-18 02:08:26
The dir() command gives a list of all the variables in your global namespace. If your variable is x_val , use
'x_val' in dir()
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