python unstack()函数    python isalpha()函数    python isdigit()函数    python strip()函数    python for in 函数    python sorted 函数    python求平均值函数    python68个内置函数    python math库常用函数    python的isinstance函数    python ord()函数    python all()函数    python mean()函数    python的绝对值函数    python head()函数    python enumerate函数    python hasattr函数    python flatten函数    python counter函数    python reverse函数    python中math库函数    python中的函数是什么    什么是python中的函数    python中的open函数    python中常用的函数    python range 函数    python求余函数    python str函数    python中str()函数    python中strip()函数    python rstrip函数的用法    python中range()函数    python中的内置函数    python isinstance函数    python ord函数    python析构函数    python pow函数    len函数 python    python min函数    python去重函数    python中绝对值函数    python中的pow函数怎么用    python len()函数    python中的sorted函数    python choices函数    python uniform函数    python函数中的函数    python 类 函数    python 常用的函数    python std函数