Summary
`PosixHelpRenderer._exists_on_path` in `awscli/help.py` (lines ~162-170) manually reimplements PATH lookup by joining each PATH entry with `os.path.join`/`os.path.exists` inside a list comprehension, then calls `any()` on the resulting list.
Proposed change
Use the stdlib `shutil.which` (available since Python 3.3): `return shutil.which(name) is not None`. Removes the manual PATH-walking logic and avoids building a throwaway list. Pure refactor, no behavior change.
Summary
`PosixHelpRenderer._exists_on_path` in `awscli/help.py` (lines ~162-170) manually reimplements PATH lookup by joining each PATH entry with `os.path.join`/`os.path.exists` inside a list comprehension, then calls `any()` on the resulting list.
Proposed change
Use the stdlib `shutil.which` (available since Python 3.3): `return shutil.which(name) is not None`. Removes the manual PATH-walking logic and avoids building a throwaway list. Pure refactor, no behavior change.