Add flake8 for project

.travis.yml

@@ -4,4 +4,5 @@ python:
 install:
     - pip install -r requirements.txt
 script:
+    - flake8
     - python -m unittest

main.py

@@ -79,9 +79,9 @@ def main(input_path, output_path):
         image_file_name = os.path.join(input_path, filename)
         filename_without_extension = os.path.splitext(filename)[0]
         text_file_path = os.path.join(output_path, filename_without_extension)
-        _ = subprocess.run(['tesseract', image_file_name, text_file_path],
-                           stdout=subprocess.PIPE,
-                           stderr=subprocess.PIPE)
+        subprocess.run(['tesseract', image_file_name, text_file_path],
+                       stdout=subprocess.PIPE,
+                       stderr=subprocess.PIPE)
         logging.debug("Successfully parsed {}".format(filename))
         successful_files += 1
 

requirements.txt

@@ -1,3 +1,7 @@
+flake8==3.5.0
+mccabe==0.6.1
 mock==2.0.0
 pbr==4.3.0
+pycodestyle==2.3.1
+pyflakes==1.6.0
 six==1.11.0

setup.cfg

@@ -0,0 +1,5 @@
+[flake8]
+max-line-length = 120
+exclude =
+    venv,
+    .git,