Given a Pandas DataFrame, we have to replace all values in a column, based on the given condition. By Pranit Sharma Last updated : September 21, 2023 Columns are the different fields that contain their particular values when we create a DataFrame. We can perform certain operations on both...
# Creating a new column 'D' based on a condition in column 'A' df['D'] = df['A'].apply(lambda x: 'Even' if x % 2 == 0 else 'Odd') print(df) Output: A D 0 1 Odd 1 2 Even 2 3 Odd 使用lambda函数来检查' a '中的每个元素是偶数还是奇数,并将结果分配给' D '列。 向...
# Creating a new column 'D' based on a condition in column 'A' df['D'] = df['A'].apply(lambda x: 'Even' if x % 2 == 0 else 'Odd') print(df) Output: A D 0 1 Odd 1 2 Even 2 3 Odd 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 使用lambda函...
使用.apply()将平方函数应用于整个'A'列。不需要显式循环。 3、条件操作 也将矢量化用于条件操作,比如基于列a中的条件创建一个新的列D: importpandasaspddata= {'A': [1, 2, 3]}df = pd.DataFrame(data)#Creatinga new column'D'based on a conditionincolumn'A'df['D'] = df['A'].apply(lamb...
使用.apply()将平方函数应用于整个'A'列。不需要显式循环。 3、条件操作 也将矢量化用于条件操作,比如基于列a中的条件创建一个新的列D: import pandas as pd data = {'A': [1, 2, 3]} df = pd.DataFrame(data) # Creating a new column 'D' based on a condition in column 'A' ...
基于另一列条件创建新列Pandas[duplicate]可以使用ngroup：
"""making rows out of whole objects instead of parsing them into seperate columns""" # Create the dataset (no data or just the indexes) dataset = pandas.DataFrame(index=names) 追加一列,并且值为svds 代码语言:python 代码运行次数:0 运行 AI代码解释 # Add a column to the dataset where each...
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We can create a Pandas pivot table with multiple columns and return reshaped DataFrame. By manipulating given index or column values we can reshape the data based on column values. Use thepandas.pivot_tableto create a spreadsheet-stylepivot table in pandas DataFrame. This function does not suppo...
Either of the 2 conditions has to be met for the boolean array to contain aTruevalue. The expression calculates the sum of9 + 15 + 5and returns29. #Sum values in a column based on a condition usingquery() You can also use theDataFrame.query()method to sum the values in a column ba...