python - 对 pandas 数据框中的列进行排序

Question

我有一个带有列标题“DIV3、DIV4、DIV5 ... DIV30”的数据框

我的问题是 pandas 会按以下方式对列进行排序:

 DIV10, DIV11, DIV12..., DIV3, DIV4, DIV5

有没有办法让个位数排在前面？即:

 DIV3, DIV4, DIV5... DIV30

Answer 1

您可以通过sorting in "human order"解决这个问题:

import re
import pandas as pd
def natural_keys(text):
    '''
    alist.sort(key=natural_keys) sorts in human order
    http://nedbatchelder.com/blog/200712/human_sorting.html
    (See Toothy's implementation in the comments)
    '''
    def atoi(text):
        return int(text) if text.isdigit() else text

    return [atoi(c) for c in re.split('(\d+)', text)]

columns = ['DIV10', 'DIV11', 'DIV12', 'DIV3', 'DIV4', 'DIV5']    
df = pd.DataFrame([[1]*len(columns)], columns=columns)
print(df)
#    DIV10  DIV11  DIV12  DIV3  DIV4  DIV5
# 0      1      1      1     1     1     1

df = df.reindex(columns=sorted(df.columns, key=natural_keys))
print(df)

产量

   DIV3  DIV4  DIV5  DIV10  DIV11  DIV12
0     1     1     1      1      1      1