[refactor] Single quotes consistency

3 files changed, 7 insertions, 7 deletions

diff --git a/youtube_dl/postprocessor/execafterdownload.py b/youtube_dl/postprocessor/execafterdownload.py
index 13794b7ba..74f66d669 100644
--- a/youtube_dl/postprocessor/execafterdownload.py
+++ b/youtube_dl/postprocessor/execafterdownload.py
@@ -19,7 +19,7 @@ class ExecAfterDownloadPP(PostProcessor):
 
         cmd = cmd.replace('{}', shlex_quote(information['filepath']))
 
-        self._downloader.to_screen("[exec] Executing command: %s" % cmd)
+        self._downloader.to_screen('[exec] Executing command: %s' % cmd)
         retCode = subprocess.call(cmd, shell=True)
         if retCode != 0:
             raise PostProcessingError(
diff --git a/youtube_dl/postprocessor/metadatafromtitle.py b/youtube_dl/postprocessor/metadatafromtitle.py
index a56077f20..42377fa0f 100644
--- a/youtube_dl/postprocessor/metadatafromtitle.py
+++ b/youtube_dl/postprocessor/metadatafromtitle.py
@@ -24,7 +24,7 @@ class MetadataFromTitlePP(PostProcessor):
            '(?P<title>.+)\ \-\ (?P<artist>.+)'
         """
         lastpos = 0
-        regex = ""
+        regex = ''
         # replace %(..)s with regex group and escape other string parts
         for match in re.finditer(r'%\((\w+)\)s', fmt):
             regex += re.escape(fmt[lastpos:match.start()])
diff --git a/youtube_dl/postprocessor/xattrpp.py b/youtube_dl/postprocessor/xattrpp.py
index 7d88e1308..480d48d05 100644
--- a/youtube_dl/postprocessor/xattrpp.py
+++ b/youtube_dl/postprocessor/xattrpp.py
@@ -80,15 +80,15 @@ class XAttrMetadataPP(PostProcessor):
                     assert ':' not in key
                     assert os.path.exists(path)
 
-                    ads_fn = path + ":" + key
+                    ads_fn = path + ':' + key
                     try:
-                        with open(ads_fn, "wb") as f:
+                        with open(ads_fn, 'wb') as f:
                             f.write(value)
                     except EnvironmentError as e:
                         raise XAttrMetadataError(e.errno, e.strerror)
             else:
-                user_has_setfattr = check_executable("setfattr", ['--version'])
-                user_has_xattr = check_executable("xattr", ['-h'])
+                user_has_setfattr = check_executable('setfattr', ['--version'])
+                user_has_xattr = check_executable('xattr', ['-h'])
 
                 if user_has_setfattr or user_has_xattr:
 
@@ -150,7 +150,7 @@ class XAttrMetadataPP(PostProcessor):
                 value = info.get(infoname)
 
                 if value:
-                    if infoname == "upload_date":
+                    if infoname == 'upload_date':
                         value = hyphenate_date(value)
 
                     byte_value = value.encode('utf-8')