October 2019
Beginner to intermediate
674 pages
16h 43m
English
Content preview from Mastering pandas - Second Edition
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Alignment of DataFrames
The union of two DataFrames occurs based on row and column indices. Let's understand this through an example. Consider two DataFrames:
ore1DF=pd.DataFrame(np.array([[20,35,25,20],[11,28,32,29]]),columns=['iron','magnesium','copper','silver'])ore2DF=pd.DataFrame(np.array([[14,34,26,26],[33,19,25,23]]),columns=['iron','magnesium','gold','silver'])
The + operator will add values in columns with the same labels in both DataFrames:
ore1DF + ore2DF
The following is the output:
The columns—copper and gold—were not found in both the DataFrames. Hence, NA has been appended in these columns.
If you combine a DataFrame object ...
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