1. 从字典创建dataframe
|
1
2
3
4
5
6
7
8
|
>>> import pandas
>>> dict_a = {'user_id':['webbang','webbang','webbang'],'book_id':['3713327','4074636','26873486'],'rating':['4','4','4'],'mark_date':['2017-03-07','2017-03-07','2017-03-07']}
>>> df = pandas.dataframe(dict_a) # 从字典创建dataframe
>>> df # 创建好的df列名默认按首字母顺序排序，和字典中的先后顺序并不一样，字典中是'user_id','book_id','rating','mark_date'
book_id mark_date rating user_id
0 3713327 2017-03-07 4 webbang
1 4074636 2017-03-07 4 webbang
2 26873486 2017-03-07 4 webbang
|
2. 调整列顺序
|
1
2
3
4
5
6
|
>>> df = df[['user_id','book_id','rating','mark_date']] # 调整列顺序为'user_id','book_id','rating','mark_date'
>>> df
user_id book_id rating mark_date
0 webbang 3713327 4 2017-03-07
1 webbang 4074636 4 2017-03-07
2 webbang 26873486 4 2017-03-07
|
3. 调整index为从1开始
|
1
2
3
4
5
6
|
>>> df.index = range(1,len(df) + 1) # 将index改成从1开始
>>> df
user_id book_id rating mark_date
1 webbang 3713327 4 2017-03-07
2 webbang 4074636 4 2017-03-07
3 webbang 26873486 4 2017-03-07
|
dataframe操作汇总：http://www.zzvips.com/article/177059.html
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://www.cnblogs.com/huahuayu/p/8324755.html