replace exit() with sys.exit() (#590)

kcc-c2e.py

@@ -22,7 +22,7 @@ import sys
 
 if sys.version_info < (3, 8, 0):
     print('ERROR: This is a Python 3.8+ script!')
-    exit(1)
+    sys.exit(1)
 
 from multiprocessing import freeze_support, set_start_method
 from kindlecomicconverter.startup import startC2E

kcc-c2p.py

@@ -22,7 +22,7 @@ import sys
 
 if sys.version_info < (3, 8, 0):
     print('ERROR: This is a Python 3.8+ script!')
-    exit(1)
+    sys.exit(1)
 
 from multiprocessing import freeze_support, set_start_method
 from kindlecomicconverter.startup import startC2P

kcc.py

@@ -22,7 +22,7 @@ import sys
 
 if sys.version_info < (3, 8, 0):
     print('ERROR: This is a Python 3.8+ script!')
-    exit(1)
+    sys.exit(1)
 
 # OS specific workarounds
 import os

kindlecomicconverter/comic2ebook.py

@@ -1105,13 +1105,13 @@ def checkTools(source):
         process.communicate()
         if process.returncode != 0 and process.returncode != 7:
             print('ERROR: 7z is missing!')
-            exit(1)
+            sys.exit(1)
     if options.format == 'MOBI':
         kindleGenExitCode = Popen('kindlegen -locale en', stdout=PIPE, stderr=STDOUT, stdin=PIPE, shell=True)
         kindleGenExitCode.communicate()
         if kindleGenExitCode.returncode != 0:
             print('ERROR: KindleGen is missing!')
-            exit(1)
+            sys.exit(1)
 
 
 def checkPre(source):

kindlecomicconverter/shared.py

@@ -23,6 +23,7 @@ from hashlib import md5
 from html.parser import HTMLParser
 from distutils.version import StrictVersion
 from re import split
+import sys
 from traceback import format_tb
 
 
@@ -133,4 +134,4 @@ def dependencyCheck(level):
         missing.append('Pillow 5.2.0+')
     if len(missing) > 0:
         print('ERROR: ' + ', '.join(missing) + ' is not installed!')
-        exit(1)
+        sys.exit(1)

setup.py

@@ -40,16 +40,16 @@ class BuildBinaryCommand(distutils.cmd.Command):
             os.system('pyinstaller -y -F -i icons/comic2ebook.icns -n "Kindle Comic Converter" -w -s kcc.py')
             # TODO /usr/bin/codesign --force -s "$MACOS_CERTIFICATE_NAME" --options runtime dist/Applications/Kindle\ Comic\ Converter.app -v
             os.system('appdmg kcc.json dist/KindleComicConverter_osx_' + VERSION + '.dmg')
-            exit(0)
+            sys.exit(0)
         elif sys.platform == 'win32':
             os.system('pyinstaller -y -F -i icons\\comic2ebook.ico -n KCC_' + VERSION + ' -w --noupx kcc.py')
-            exit(0)
+            sys.exit(0)
         elif sys.platform == 'linux':
             os.system(
                 'pyinstaller --hidden-import=queue -y -F -i icons/comic2ebook.ico -n kcc_linux_' + VERSION + ' kcc.py')
-            exit(0)
+            sys.exit(0)
         else:
-            exit(0)
+            sys.exit(0)
 
 
 setuptools.setup(