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a function to create a null matrix in python

def plot_null_matrix(df, figsize=(18,15)):    
	# initiate the figure    
	plt.figure(figsize=figsize)    
	# create a boolean dataframe based on whether values are null    
    df_null = df.isnull()    
    # create a heatmap of the boolean dataframe    
    sns.heatmap(~df_null, cbar=False, yticklabels=False)    
    plt.show()

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a function to create a null matrix in python

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