Python: small fixes

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

zUtil_Python/dct_utils_git.py

@@ -53,7 +53,7 @@ class DCTGit(object):
         return value[:-1]
 
     def __init__(self, repo_dir = ""):
-        if repo_dir is "":
+        if repo_dir == "":
             repo_dir = os.path.join(os.getcwd(), "dct")
         self.repo_dir = repo_dir
 
@@ -69,7 +69,7 @@ class DCTGit(object):
 #        parent_dir = os.path.abspath(os.path.join(dest_dir, os.path.pardir))
 #        os.chdir(parent_dir)
 
-        if branch is not "":
+        if not branch == "":
             cmd = "%s -b %s" % (cmd, branch)
 
         cmd = shlex.split(cmd)
@@ -84,7 +84,7 @@ class DCTGit(object):
         return self._cloneRepo(cmd, dest_dir, branch)
 
     def updateRepo(self, repo_dir = ""):
-        if repo_dir is not "":
+        if not repo_dir == "":
             self.repo_dir = repo_dir
         currentDir = os.getcwd()
 
@@ -106,7 +106,7 @@ class DCTGit(object):
         cmd = ["git", "config", "--global", conf_path, value]
         subobj = subprocess.Popen(cmd, stderr = subprocess.PIPE)
 
-        if subobj.wait() is not 0:
+        if not subobj.wait() == 0:
             raise ValueError("Couldn't set property: %s, as %s, in repo %s."
                              % (conf_path, value, self.repo_dir))
 
@@ -119,7 +119,7 @@ class DCTGit(object):
         subobj = subprocess.Popen(cmd, stderr = subprocess.PIPE, \
                                   stdout = subprocess.PIPE)
 
-        if subobj.wait() is not 0:
+        if not subobj.wait() == 0:
             raise ValueError("Couldn't get property: %s, in repo %s."
                              % (conf_path, self.repo_dir))