sort_values函数是pandas中用于排序的主要函数。你可以通过指定by参数来指明根据哪一列进行排序。 (可选)指定排序方式为升序或降序: 默认情况下,sort_values函数会按升序(ascending order)进行排序。如果你需要降序(descending order)排序,可以将ascending参数设置为False。 查看排序后的DataFrame以确保排序正确: 排序完成...
by: column or list of columns to sort DataFrame by. axis: either 1 or 0, means row-wise or column-wise ascending: if true, it will sort in ascending order or vice-versa. Here, we will passascending = Falseas a parameter inside the "df.sort_values() method to sort in descending or...
# Sorting by columns "Country" and then "Continent"df.sort_values(by=['Country','Continent']) Python Copy 输出: 对Pandas数据框架进行排序 例子5:按多列但不同顺序对数据帧进行排序 # Sorting by columns "Country" in descending# order and then "Continent" in ascending orderdf.sort_values(by=[...
data = {'column1': [1,2,3], 'column2': ['a','b','c']} df = pl.DataFrame(data) # 使用表达式进行选择 selected_df = df.select(['column1']) # 使用表达式进行过滤 filtered_df = df.filter(df['column1'] >1) selected_df filtered_df #2. ...
food_info.sort_values("Sodium_(mg)", inplace=True)#默认对"Sodium_(mg)"这一列从小到大进行排序print(food_info["Sodium_(mg)"])#Sorts by descending order, rather than ascending.按降序排序,而不是升序排序。food_info.sort_values("Sodium_(mg)", inplace=True, ascending=False)print(food_info...
Sort by the values along either axis 参数: by : str or list of str Name or list of names which refer to the axis items. axis : {0 or ‘index’, 1 or ‘columns’}, default 0 Axis to direct sorting ascending : bool or list of bool, default True Sort ascending vs. descending. Sp...
sort_values(by=['col1', 'col2']) col1 col2 col3 1 A 1 1 0 A 2 0 2 B 9 9 5 C 4 3 4 D 7 2 3 NaN 8 4 Sort Descending >>> df.sort_values(by='col1', ascending=False) col1 col2 col3 4 D 7 2 5 C 4 3 2 B 9 9 0 A 2 0 1 A 1 1 3 NaN 8 4 Putting...
df.sort_values(by=['column_1','column_2'])#descendingdf.sort_values(by='column_1', ascending=0) 选择(Select) 根据Pandas 列中的值从DataFrame中选择行 超级有用的片段 df.loc[df[‘column_name’] == some_value] df.loc[df['column_name'].isin(some_values)] ...
frame.sort_index() 默认按列排序,axis=0 排index frame.sort_index(axis='columns') 按行排序,axis=1 排column ascending:升序,descending:降序,ascending=False:降序; 默认是升序,默认把缺失值放在最后 frame.sort_values(by='b') 按columns=b这一列的值进行排序 axis=0 重复索引: 索引可以重复,常用于分层...
If you need to sort the rows in descending order, just pass ascending=False: # Sort rows by their index (descending) dogs_sorted_desc = dogs.sort_index(ascending=False) print(dogs_sorted_desc) Powered By Similarly, if you have a multi-level (hierarchical) index, sort_index() can also...