Pandas
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Adding a prefix to column valuesAdding leading zeros to strings of a columnAdding new column using listsAdding padding to a column of stringsBit-wise ORChanging column type to stringConditionally updating values of a DataFrameConverting all object-typed columns to categorical typeConverting column type to dateConverting column type to floatConverting column type to integerConverting K and M to numerical formConverting string categories or labels to numeric valuesEncoding categorical variablesExpanding lists vertically in a DataFrameExpanding strings vertically in a DataFrameExtracting numbers from columnFilling missing value in Index of DataFrameFiltering column values using boolean masksLogical AND operationMaking DataFrame string column lowercaseMapping True and False to 1 and 0 respectivelyMapping values of a DataFrame using a dictionaryModifying a single value in a DataFrameRemoving characters from columnsRemoving comma from column valuesRemoving first n characters from column valuesRemoving last n characters from column valuesRemoving leading substringRemoving trailing substringReplacing infinities with another value in DataFrameReplacing values in a DataFrameRounding valuesSorting categorical columnsUsing previous row to create new columns
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Adding new column using lists in Pandas DataFrame
schedule Aug 12, 2023
Last updated local_offer
Tags Python●Pandas
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Adding a single column using a list
Consider the following DataFrame:
df = pd.DataFrame({"A":[3,4],"B":[6,7]}, index=["a","b"])df
A Ba 3 6b 4 7
To create column C using a list:
df["C"] = [8,9]df
A B Ca 3 6 8b 4 7 9
Adding multiple columns using a nested list
Consider the same DataFrame as above:
df
A Ba 3 6b 4 7
To add a two columns using a nested list:
my_data = [[8,9],[10,11]]pd.concat([df, pd.DataFrame(my_data, index=df.index, columns=["C","D"])], axis=1)
A B C Da 6 8 8 9b 7 9 10 11
Here, we first convert my_data into a DataFrame:
pd.DataFrame(my_data, index=df.index, columns=["C","D"])
C Da 8 9b 10 11
Note the following:
Published by Isshin Inada
Edited by 0 others
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