Fix some issues found by lgtm.com

msvc/pc_base.py

@@ -12,7 +12,6 @@
 # Date: March 10, 2016
 
 import os
-import sys
 import argparse
 
 class BasePCItems:
@@ -55,7 +54,7 @@ class BasePCItems:
 
         # check and setup the exec_prefix
         if getattr(args, 'exec_prefix', None) is None:
-            exec_prefix_use_shorthand = True
+            # exec_prefix_use_shorthand = True
             self.exec_prefix = '${prefix}'
         else:
             if args.exec_prefix.startswith('${prefix}'):

msvc/replace.py

@@ -10,10 +10,8 @@
 # Author: Fan, Chun-wei
 # Date: September 03, 2014
 
-import os
 import sys
 import re
-import string
 import argparse
 
 valid_actions = ['remove-prefix',

src/psl-make-dafsa

@@ -222,7 +222,6 @@ The bytes in the generated array has the following meaning:
 
 import sys
 import os.path
-import time
 import hashlib
 
 class InputError(Exception):
@@ -565,7 +564,7 @@ def parse_psl(infile, utf_mode, codecs):
       if section == 0:
         if b'===BEGIN ICANN DOMAINS===' in line:
           section = PSL_FLAG_ICANN
-        elif section == 0 and b'===BEGIN PRIVATE DOMAINS===' in line:
+        elif b'===BEGIN PRIVATE DOMAINS===' in line:
           section = PSL_FLAG_PRIVATE
       elif section == PSL_FLAG_ICANN and b'===END ICANN DOMAINS===' in line:
         section = 0