python开发问题汇总

1. 如何将一列的所有值转换为Pandas DataFrame中的列名

原来数据：

想要数据：

实现代码：

data = pd.read_csv('./data.csv', encoding='utf8')   # (149185, 3)
data2 = data.reset_index().pivot('CONS_NO','DATA_DATE','KWH')
print(data2)

http://www.it1352.com/605624.html

2. python判断文件夹是否存在并且删除/建立

os.path.exists(path)
# 删除文件夹
import shutil
# 文件夹路径
shutil.rmtree(path)
#建立文件夹
os.makedirs('d:/assist/set')

https://www.jianshu.com/p/32b02c135fba
https://www.cnblogs.com/aaronthon/p/9509538.html

3. pip下载时改源

# -i 指定pip安装源
pip install numpy -i https://pypi.douban.com/simple

豆瓣源： https://pypi.douban.com/simple
清华源：https://pypi.tuna.tsinghua.edu.cn/simple
tuna源：https://pypi.tuna.tsinghua.edu.cn/simple

4. scipy学习手册

https://wizardforcel.gitbooks.io/scipy-lecture-notes/content/index.html

5. python实现将excel文件转化成CSV格式

import pandas as pd
data = pd.read_excel('123.xls','Sheet1',index_col=0)
data.to_csv('data.csv',encoding='utf-8')

https://blog.csdn.net/sharonITlion/article/details/78693660

6. python中用pandas进行数据分析

https://blog.csdn.net/liufang0001/article/details/77856255
https://blog.csdn.net/qq_42732026/article/details/82532886
https://blog.csdn.net/qq_43283527/article/details/82898490

7. python中将科学计数法表示的数值的字符串转换成数值型数据

直接使用float

https://www.cnblogs.com/lucky-heng/p/9998099.html

8. python中不以科学计数法输出

import numpy as np
np.set_printoptions(suppress=True)

https://blog.csdn.net/Andrew_jdw/article/details/82350041