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pandas correlation matrix between one column and all others

correlations = df.corr().unstack().sort_values(ascending=False) # Build correlation matrix
correlations = pd.DataFrame(correlations).reset_index() # Convert to dataframe
correlations.columns = ['col1', 'col2', 'correlation'] # Label it
correlations.query("col1 == 'v2' & col2 != 'v2'") # Filter by variable
# output of this code will give correlation of column v2 with all the other columns
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