Use insert for all sys.path manipulations

Closes #6867.

devscripts/bash-completion.py

@@ -5,7 +5,7 @@ import os
 from os.path import dirname as dirn
 import sys
 
-sys.path.append(dirn(dirn((os.path.abspath(__file__)))))
+sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
 import youtube_dl
 
 BASH_COMPLETION_FILE = "youtube-dl.bash-completion"

devscripts/fish-completion.py

@@ -6,7 +6,7 @@ import os
 from os.path import dirname as dirn
 import sys
 
-sys.path.append(dirn(dirn((os.path.abspath(__file__)))))
+sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
 import youtube_dl
 from youtube_dl.utils import shell_quote
 

devscripts/gh-pages/update-sites.py

@@ -6,7 +6,7 @@ import os
 import textwrap
 
 # We must be able to import youtube_dl
-sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))))
 
 import youtube_dl
 

devscripts/make_supportedsites.py

@@ -9,7 +9,7 @@ import sys
 
 # Import youtube_dl
 ROOT_DIR = os.path.join(os.path.dirname(__file__), '..')
-sys.path.append(ROOT_DIR)
+sys.path.insert(0, ROOT_DIR)
 import youtube_dl
 
 

devscripts/zsh-completion.py

@@ -5,7 +5,7 @@ import os
 from os.path import dirname as dirn
 import sys
 
-sys.path.append(dirn(dirn((os.path.abspath(__file__)))))
+sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
 import youtube_dl
 
 ZSH_COMPLETION_FILE = "youtube-dl.zsh"

youtube_dl/__main__.py

@@ -11,7 +11,7 @@ if __package__ is None and not hasattr(sys, "frozen"):
     # direct call of __main__.py
     import os.path
     path = os.path.realpath(os.path.abspath(__file__))
-    sys.path.append(os.path.dirname(os.path.dirname(path)))
+    sys.path.insert(0, os.path.dirname(os.path.dirname(path)))
 
 import youtube_dl