Columns and DataType Not Explicitly Set
Explicitly select columns and set DataType in Pandas.
readability
Merge API Parameter Not Explicitly Set
Explicitly specify on, how and validate parameter for df.merge() API in Pandas for better readability.
Matrix Multiplication API Misused
When the multiply operation is performed on two-dimensional matrixes, use np.matmul() instead of np.dot() in NumPy for better semantics.