pandas 数据排序.sort_index()和.sort_values()答:注意:必须指定by参数,即必须指定哪几行或哪几列;无法根据index名和columns名排序(由.sort_index()执行) DataFrame.sort_values(by, axis=0, ascending=True, inplace=False, kind='quicksort', na_position='last') axis:{0 or ‘index’, 1 or ‘columns’}, default 0,默认按照列排序,即纵向排序;...
python中,dataframe或series对象可以对列进行运算么(加减乘除)答:'__reversed__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']然后查看list的pop方法的作用和用法:help(list....
怎么用python进行数据答:obj = Series([1,2,3,4],index=['a','b','c','d']) frame = DataFrame(np.arange(9).reshape((3,3)),index = ['a','c','d'],columns = ['Ohio','Texas','California'])#Series切片和索引#print obj[obj < 2]#注意:利用标签的切片与python的切片不同,两端都是包含的(有道理)print ...