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Fail fast if site-packages are in the path #5301

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Merged
merged 3 commits into from
Jun 30, 2018
Merged

Fail fast if site-packages are in the path #5301

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783faad
Fail fast if site-packages are in the path
emmatyping Jun 29, 2018
01a6f4b
Respond to feedback
emmatyping Jun 29, 2018
df34473
Make code cleaner
emmatyping Jun 30, 2018
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14 changes: 13 additions & 1 deletion mypy/build.py
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Original file line number Diff line number Diff line change
Expand Up @@ -275,9 +275,21 @@ def compute_search_paths(sources: List[BuildSource],
if alt_lib_path:
mypypath.insert(0, alt_lib_path)

package_path = tuple(_get_site_packages_dirs(options.python_executable))
for site_dir in package_path:
assert site_dir not in lib_path
if site_dir in mypypath:
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There are of course many variant spellings of the same path that won't be caught by this check. I don't think it's necessary to worry about that (normalizing the paths feels kind of expensive), but we shouldn't feel too complacent. :-)

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Yeah, it won't be perfect, but I think it will catch and help debug some more common cases, as well as avoid crashes in those circumstances.

print("{} is in the MYPYPATH. Please remove it.".format(site_dir), file=sys.stderr)
sys.exit(1)
elif site_dir in python_path:
print("{} is in the PYTHONPATH. Please change directory"
" so it is not.".format(site_dir),
file=sys.stderr)
sys.exit(1)

return SearchPaths(tuple(reversed(python_path)),
tuple(mypypath),
tuple(_get_site_packages_dirs(options.python_executable)),
package_path,
tuple(lib_path))


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