以下代码的输出表未排序，尽管我在代码中包括了排序。 请查看警告消息
我为不同的数据集运行了相同的代码，并且工作正常。 基本上，我想查看所有缺失值按升序排序的列；因此我可以轻松地在顶部看到缺少更多值的列。
import pandas as pd
import numpy as np
location = "DC_Properties.csv"
dc_df = pd.read_csv(location)
dc_df.head(7) #print 7 first rows
total = dc_df.isnull().sum().sort_values(ascending=False)
percent_1 = dc_df.isnull().sum()/dc_df.isnull().count()*100
percent_2 = (round(percent_1, 1)).sort_values(ascending=False)
missing_data = pd.concat([total, percent_2], axis=1, keys=['Total', '%'])
missing_data.head(20)`
C:\Users\nikil\Anaconda3\lib\site-packages\ipykernel_launcher.py:5: FutureWarning: Sorting because non-concatenation axis is not aligned. A future version of pandas will change to not sort by default. To accept the future behavior, pass 'sort=False'. To retain the current behavior and silence the warning, pass 'sort=True'.