diff --git a/mrepo.py b/mrepo.py
index d87e434..c6313c2 100755
--- a/mrepo.py
+++ b/mrepo.py
@@ -19,6 +19,7 @@
 import glob
 import os
 from os.path import exists as path_exists
+from os.path import isdir as path_is_dir
 from os.path import join as path_join
 
 import re
@@ -502,7 +503,7 @@ def addfile((filelist, ), path, files):
 
     def check(self):
         "Return what repositories require an update and write .newsha1sum"
-        if not os.path.isdir(self.wwwdir):
+        if not path_is_dir(self.wwwdir):
             return
         sha1file = path_join(self.wwwdir, '.sha1sum')
         remove(sha1file + '.tmp')
@@ -605,13 +606,13 @@ def repomd(self):
             opts = ' -v' + opts
         if not self.dist.promoteepoch:
             opts = opts + ' -n'
-        if os.path.isdir(self.wwwdir):
+        if path_is_dir(self.wwwdir):
             repoopts = opts
             if cf.cachedir:
                 cachedir = path_join(cf.cachedir, self.dist.nick, self.name)
                 mkdir(cachedir)
                 repoopts = repoopts + ' --cachedir "%s"' % cachedir
-            if os.path.isdir(path_join(self.wwwdir, '.olddata')):
+            if path_is_dir(path_join(self.wwwdir, '.olddata')):
                 remove(path_join(self.wwwdir, '.olddata'))
             groupfile = path_join(cf.srcdir, self.dist.nick, self.name + '-comps.xml')
             if os.path.isfile(groupfile):
@@ -779,8 +780,8 @@ def symlink(src, dst):
         if os.path.samefile(src, abspath(os.readlink(dst), src)):
             return
         os.unlink(dst)
-    elif os.path.isdir(dst):
-        if os.path.isdir(src):
+    elif path_is_dir(dst):
+        if path_is_dir(src):
             if os.path.samefile(src, dst):
                 return
         else:
@@ -794,7 +795,7 @@ def symlink(src, dst):
 
     src = relpath(src, dst)
 
-    if not os.path.isdir(os.path.dirname(dst)):
+    if not path_is_dir(os.path.dirname(dst)):
         mkdir(os.path.dirname(dst))
     os.symlink(src, dst)
 
@@ -803,7 +804,7 @@ def copy(src, dst):
     "Copy a file, force if dst exists"
     if op.dryrun:
         return
-    if os.path.isdir(dst):
+    if path_is_dir(dst):
         dst = path_join(dst, os.path.basename(src))
     if os.path.islink(dst) or os.path.isfile(dst):
         os.unlink(dst)
@@ -811,7 +812,7 @@ def copy(src, dst):
     if not path_exists(dst):
         if os.path.isfile(src):
             shutil.copy2(src, dst)
-        elif os.path.isdir(src):
+        elif path_is_dir(src):
             shutil.copytree(src, dst)
 
 
@@ -822,7 +823,7 @@ def remove(file):
             return
         if os.path.islink(file):
             os.unlink(file)
-        elif os.path.isdir(file):
+        elif path_is_dir(file):
             try:
                 os.rmdir(file)
             except:
@@ -1026,7 +1027,7 @@ def mail(subject, msg):
 
 def readconfig():
     cf = Config()
-    if cf.confdir and os.path.isdir(cf.confdir):
+    if cf.confdir and path_is_dir(cf.confdir):
         files = glob.glob(path_join(cf.confdir, '*.conf'))
         files.sort()
         for configfile in files:
@@ -1092,7 +1093,6 @@ def listrpms(dirs, relative=''):
         dirs = (dirs,)
     if relative and not relative.endswith('/'):
         relative += '/'
-    isdir = os.path.isdir
 
     def processdir(rpms, path, files):
         if relative:
@@ -1101,7 +1101,7 @@ def processdir(rpms, path, files):
             path2 = path
         for f in files:
             pf = path_join(path, f)
-            if f.endswith('.rpm') and path_exists(pf) and not isdir(pf):
+            if f.endswith('.rpm') and path_exists(pf) and not path_is_dir(pf):
                 rpms.append((f, path2))
 
     rpms = []