envsetup: Add pygrep function to grep all python files

Test: manual - searched .py files in shell

Change-Id: I6abd4615588ef0dbe7b46b0e9159bd814f63ed09
Signed-off-by: DroidFreak32 <rushabshah32@gmail.com>

envsetup.sh

@@ -34,6 +34,7 @@ Invoke ". build/envsetup.sh" from your shell to add the following functions to y
 - rsgrep:     Greps on all local Rust files.
 - sepgrep:    Greps on all local sepolicy files.
 - sgrep:      Greps on all local source files.
+- pygrep:     Greps on all local Python files.
 - godir:      Go to the directory containing a file.
 - allmod:     List all modules.
 - gomod:      Go to the directory containing a module.
@@ -1256,6 +1257,12 @@ function rcgrep()
         -exec grep --color -n "$@" {} +
 }
 
+function pygrep()
+{
+    find . -name .repo -prune -o -name .git -prune -o -name out -prune -o -type f -name "*\.py" \
+        -exec grep --color -n "$@" {} +
+}
+
 case `uname -s` in
     Darwin)
         function mgrep()