chore:try6 fixing flake8 errors

src/meanvariancefunction.py

@@ -68,6 +68,7 @@ def mean_variance(filepath: str, output_dir: str = os.getcwd()+'/') -> str:
     plt.title('Mean gene expression vs. variance')
     plt.savefig(output_dir+'/meanvarianceplot.png')
     plt.show()
+
     # Constructs csv file and saves it in the users directory
     path = output_dir+'/results_mean_var_function.csv'
     with open(path, 'w') as csv_file: