[PATCH 17/20] git-p4: compare to singletons with "is" and "is not"

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PEP8 recommends that comparisons with singletons such as None should be
done with "is" and "is not", and never equality operators.

This guideline is described here:
https://www.python.org/dev/peps/pep-0008/#programming-recommendations

Signed-off-by: Joel Holdsworth <jholdsworth@xxxxxxxxxx>
---
 git-p4.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/git-p4.py b/git-p4.py
index 0159e35adc..2a3409ebd2 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -930,7 +930,7 @@ def p4Where(depotPath):
             if data[:space] == depotPath:
                 output = entry
                 break
-    if output == None:
+    if not output:
         return ""
     if output["code"] == "error":
         return ""
@@ -952,7 +952,7 @@ def currentGitBranch():
 
 
 def isValidGitDir(path):
-    return git_dir(path) != None
+    return git_dir(path) is not None
 
 
 def parseRevision(ref):
@@ -4497,7 +4497,7 @@ def main():
     global verbose
     verbose = cmd.verbose
     if cmd.needsGit:
-        if cmd.gitdir == None:
+        if not cmd.gitdir:
             cmd.gitdir = os.path.abspath(".git")
             if not isValidGitDir(cmd.gitdir):
                 # "rev-parse --git-dir" without arguments will try $PWD/.git
-- 
2.34.1




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