chore:try5 fixing flake8 errors

src/meanvariancefunction.py

@@ -11,13 +11,14 @@ import matplotlib.pyplot as plt
 def mean_variance(filepath: str, output_dir: str = os.getcwd()+'/') -> str:
     """For observed gene counts calcuclate mean and var.
 
-    ! At the moment the function does not check the import files format,
+    At the moment the function does not check the import files format,
     be careful, and only add text files in the format
-    geneid number_of_transcipts !
+    geneid number_of_transcipts.
 
     Args:
         directory with text files of gene expression
         counts in individual cells.
+
     Returns:
         1. Path to Csv-formatted table with GeneID, Mean, Variance of the
         count, and Scatterplot of mean vs variance for all genes.
@@ -26,8 +27,8 @@ def mean_variance(filepath: str, output_dir: str = os.getcwd()+'/') -> str:
         ValueError: If there are no files in directory
 
     """
-    files = [file for file in glob(filepath)]
     # Open each file in the input directory, raises error if no file is found
+    files = [file for file in glob(filepath)]
 
     if len(files) == 0:
         raise ValueError('No files in directory:', filepath)