fix flake8 issues

build.py

@@ -1,9 +1,8 @@
 #   -*- coding: utf-8 -*-
-from pybuilder.core import *
+from pybuilder.core import task, dependents, depends, use_plugin, init
 from enum import Enum
 import glob
 import shutil
-import warnings
 import sys
 import os
 import subprocess
@@ -49,6 +48,7 @@ def delete(logger, path):
         elif (os.path.isdir(path)):
             shutil.rmtree(path)
 
+
 @task
 def clean(logger, project):
     delete_patterns = [
@@ -103,7 +103,7 @@ def clean(logger, project):
 
 
 @task
-## build for the current operating system
+# build for the current operating system
 def build(logger, project):
     if (project.os == OS.Linux or project.os == OS.MacOS):
         buildUnix(logger, project)
@@ -120,6 +120,7 @@ def mkdir_p(path):
     except FileExistsError:
         pass
 
+
 @task
 @dependents("installUnix")
 def buildUnix(logger, project):
@@ -137,6 +138,7 @@ def buildUnix(logger, project):
     subprocess.run("rm -rf zip", shell=True)
     subprocess.run("echo '#!/usr/bin/env python' > youtube-dl ; cat youtube-dl.zip >> youtube-dl ; rm  youtube-dl.zip; chmod a+x youtube-dl", shell=True)
 
+
 @task
 @depends("buildUnix")
 def installUnix(logger, project):
@@ -161,10 +163,12 @@ def installUnix(logger, project):
                     install -m 644 youtube-dl.fish {DESTDIR}{SYSCONFDIR}/fish/completions/youtube-dl.fish",
                    shell=True)
 
+
 @task
 def buildWin32(logger, project):
     subprocess.run("python -m setup.py py2exe")
 
+
 @task
 def offlinetest(logger, project):
     res = subprocess.run("python -m nose --verbose test \
@@ -180,6 +184,7 @@ def offlinetest(logger,project):
     if (res.returncode != 0):
         sys.exit(res.returncode)
 
+
 @task
 def test(logger, project):
     res = subprocess.run("nosetests --with-coverage \
@@ -190,4 +195,3 @@ def test(logger, project):
                          shell=True)
     if (res.returncode != 0):
         sys.exit(res.returncode)
-