python 解一元二次方程,不明白为什么x1没有defined.求大神帮忙.
define function in python3
define and calling python functions3. while loops4.
python中的函数初览_【判断题】在python中,使用关键字define定义函数
为啥我的line,word,mail,这些我都没有define却可以直接拿来用?
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