[python] pandas dataframe create new columns and fill with calculated values from same df

In [56]: df = pd.DataFrame(np.abs(randn(3, 4)), index=[1,2,3], columns=['A','B','C','D'])

In [57]: df.divide(df.sum(axis=1), axis=0)
Out[57]: 
          A         B         C         D
1  0.319124  0.296653  0.138206  0.246017
2  0.376994  0.326481  0.230464  0.066062
3  0.036134  0.192954  0.430341  0.340571

Examples related to python

• programming a servo thru a barometer • Is there a way to view two blocks of code from the same file simultaneously in Sublime Text? • python variable NameError • Why my regexp for hyphenated words doesn't work? • Comparing a variable with a string python not working when redirecting from bash script • is it possible to add colors to python output? • Get Public URL for File - Google Cloud Storage - App Engine (Python) • Real time face detection OpenCV, Python • xlrd.biffh.XLRDError: Excel xlsx file; not supported • Could not load dynamic library 'cudart64_101.dll' on tensorflow CPU-only installation

Examples related to pandas

• xlrd.biffh.XLRDError: Excel xlsx file; not supported • Pandas Merging 101 • How to increase image size of pandas.DataFrame.plot in jupyter notebook? • Trying to merge 2 dataframes but get ValueError • Python Pandas User Warning: Sorting because non-concatenation axis is not aligned • How to show all of columns name on pandas dataframe? • Pandas/Python: Set value of one column based on value in another column • Python Pandas - Find difference between two data frames • Pandas get the most frequent values of a column • Python convert object to float

Examples related to calculated-columns

• The condition has length > 1 and only the first element will be used • pandas dataframe create new columns and fill with calculated values from same df • getting "No column was specified for column 2 of 'd'" in sql server cte? • Computed / calculated / virtual / derived columns in PostgreSQL • SQL Server String Concatenation with Null