[refactor] Single quotes consistency

1 files changed, 4 insertions, 4 deletions

diff --git a/youtube_dl/update.py b/youtube_dl/update.py
index e4a1aaa64..676ebe1c4 100644
--- a/youtube_dl/update.py
+++ b/youtube_dl/update.py
@@ -31,12 +31,12 @@ def rsa_verify(message, signature, key):
 def update_self(to_screen, verbose, opener):
     """Update the program file with the latest version from the repository"""
 
-    UPDATE_URL = "https://rg3.github.io/youtube-dl/update/"
+    UPDATE_URL = 'https://rg3.github.io/youtube-dl/update/'
     VERSION_URL = UPDATE_URL + 'LATEST_VERSION'
     JSON_URL = UPDATE_URL + 'versions.json'
     UPDATES_RSA_KEY = (0x9d60ee4d8f805312fdb15a62f87b95bd66177b91df176765d13514a0f1754bcd2057295c5b6f1d35daa6742c3ffc9a82d3e118861c207995a8031e151d863c9927e304576bc80692bc8e094896fcf11b66f3e29e04e3a71e9a11558558acea1840aec37fc396fb6b65dc81a1c4144e03bd1c011de62e3f1357b327d08426fe93, 65537)
 
-    if not isinstance(globals().get('__loader__'), zipimporter) and not hasattr(sys, "frozen"):
+    if not isinstance(globals().get('__loader__'), zipimporter) and not hasattr(sys, 'frozen'):
         to_screen('It looks like you installed youtube-dl with a package manager, pip, setup.py or a tarball. Please use that to update.')
         return
 
@@ -85,7 +85,7 @@ def update_self(to_screen, verbose, opener):
 
     filename = sys.argv[0]
     # Py2EXE: Filename could be different
-    if hasattr(sys, "frozen") and not os.path.isfile(filename):
+    if hasattr(sys, 'frozen') and not os.path.isfile(filename):
         if os.path.isfile(filename + '.exe'):
             filename += '.exe'
 
@@ -94,7 +94,7 @@ def update_self(to_screen, verbose, opener):
         return
 
     # Py2EXE
-    if hasattr(sys, "frozen"):
+    if hasattr(sys, 'frozen'):
         exe = os.path.abspath(filename)
         directory = os.path.dirname(exe)
         if not os.access(directory, os.W_OK):