摘要：<bound method Series.函数名> 指出函数没加括号() TypeError: Index(...) must be called with a collection of some kind DataFrame的index和columns必须是某种集合[],{},但不能是元组() 阅读全文

摘要：课上练习:要求取petal_length和petal_width两列,满足筛选条件为sepal_length>=5且species=setosa 1 iris.loc[(iris['sepal_length']>5)&(iris['species']=='setosa'),['petal_lengt 阅读全文