fangafangxiaoniu的博客

前期添加csv库遇到了问题，错误显示如下： “module ‘pip’ has no attribute ‘main’” 经过上网查询，原因是更新了pip，根据网上提供的代码修改了packaging_tool.py文件，结果出现了新的错误，显示“name pip is not defined” 借鉴了链接网址修改，之后添加成功。#!/usr/bin/python# -*- codi...

分割：import numpy as npa = np.arange(12).reshape((3,4))#创建一个矩阵print(a)print(np.split(a,3,axis = 0 ))#分割矩阵，按行分成三份print(np.array_split(a,3,axis=1))#不均等分割，将4列分成三份print(np.vsplit(a,3))#横向分成三块print...

a = np.arange(4)print(a)结果[0 1 2 3]b = a.copy()#深拷贝，当a中的数值发生变化时，b是不变的print(b)深copy和浅copy 深copy新建一个对象重新分配内存地址，复制对象内容。浅copy不重新分配内存地址，内容指向之前的内存地址。浅copy如果对象中有引用其他的对象，如果对这个子对象进行修改，子对象的内容就会发生更改。...

pandas模块类似于字典形式的numpy#pandasimport pandas as pdimport numpy as nps = pd.Series([1,3,6,np.nan,44,1])print(s)dates = pd.date_range('20180711',periods=6)print(dates)df = pd.DataFrame(np.arange...

#选择数据dates = pd.date_range('20180403',periods=6)df = pd.DataFrame(np.arange(24).reshape((6,4)),index = dates,columns = ['A','B','C','D'])print(df)print('**************')print(df['A'],df.A)print(...

dates = pd.date_range('20180403',periods=6)df = pd.DataFrame(np.arange(24).reshape((6,4)),index = dates,columns = ['A','B','C','D'])df.iloc[0,1]=np.nandf.iloc[1,2]=np.nanprint(df,"#########")prin...

date = pd.read_csv('D:\pycharm_work\student.csv')print(date)date.to_pickle('student.pickle')读取：read_csv/read_pickle 写入：to_csv/….

#concatenatingdf1 = pd.DataFrame(np.ones((3,4))*0,columns = ['A','B','C','D'])df2 = pd.DataFrame(np.ones((3,4))*1,columns = ['A','B','C','D'])df3 = pd.DataFrame(np.ones((3,4))*2,columns = ['A','B',...