Add alias for git checkout

zsh/aliases.zsh

@@ -11,9 +11,13 @@ alias gl='git log'
 alias gc='git commit '
 alias ga='git add '
 alias gc1='git clone --depth 1 '
+alias gco='git checkout '
 
 alias mem='cd /dev/shm'
 alias svim='sudoedit '
 alias down='http --download '
 
+alias py='python '
+alias p3='python3 '
+
 alias open='xdg-open '