1 files changed, 4 insertions, 4 deletions
diff --git a/libbe/util/subproc.py b/libbe/util/subproc.py
index 5412b08..912433f 100644
--- a/libbe/util/subproc.py
+++ b/libbe/util/subproc.py
@@ -54,7 +54,7 @@ def invoke(args, stdin=None, stdout=PIPE, stderr=PIPE, expect=(0,),
     unicode_output == True, convert stdout and stdin strings to
     unicode before returing them.
     """
-    if cwd == None:
+    if cwd is None:
         cwd = '.'
     if isinstance(shell, (str,)):
         list_args = ' '.split(args)  # sloppy, but just for logging
@@ -81,11 +81,11 @@ def invoke(args, stdin=None, stdout=PIPE, stderr=PIPE, expect=(0,),
     stdout,stderr = q.communicate(input=stdin)
     status = q.wait()
     if unicode_output == True:
-        if encoding == None:
+        if encoding is None:
             encoding = get_encoding()
-        if stdout != None:
+        if stdout is not None:
             stdout = str(stdout, encoding)
-        if stderr != None:
+        if stderr is not None:
             stderr = str(stderr, encoding)
         libbe.LOG.debug('{0}\n{1}{2}'.format(status, stdout, stderr))
     else: