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Better error message for invalid package names passed to mypy #3447

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chernrick
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Addresses issue #2775

mypy/main.py Outdated
targets.append(BuildSource(f, crawl_up(f)[1], None))
try:
targets.append(BuildSource(f, crawl_up(f)[1], None))
except ValueError as e:
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Can you change this to catch the ValueError only from crawl_up(f)? It would be even better if the latter function returned a special result (maybe None) or (even more better :-) raised a dedicated exception, instead of essentially crashing with ValueError. Ditto for expand_dir(f) below (though there at least the scope of the except clause is sufficiently limited).

@chernrick
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@gvanrossum Thank you for the review! I have added an InvalidPackageName exception.

@gvanrossum gvanrossum merged commit 4d61418 into python:master May 26, 2017
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Thanks for the PR! It's merged now.

carljm added a commit to carljm/mypy that referenced this pull request May 30, 2017
* master: (23 commits)
  Make return type of open() more precise (python#3477)
  Add test cases that delete a file during incremental checking (python#3461)
  Parse each format-string component separately (python#3390)
  Don't warn about returning Any if it is a proper subtype of the return type (python#3473)
  Add __setattr__ support (python#3451)
  Remove bundled lib-typing (python#3337)
  Move version of extensions to post-release (python#3348)
  Fix None slice bounds with strict-optional (python#3445)
  Allow NewType subclassing NewType. (python#3465)
  Add console scripts (python#3074)
  Fix 'variance' label.
  Change label for variance section to just 'variance' (python#3429)
  Better error message for invalid package names passed to mypy (python#3447)
  Fix last character cut in html-report if file does not end with newline (python#3466)
  Print pytest output as it happens (python#3463)
  Add mypy roadmap (python#3460)
  Add flag to avoid interpreting arguments with a default of None as Optional (python#3248)
  Add type checking plugin support for functions (python#3299)
  Mismatch of inferred type and return type note (python#3428)
  Sync typeshed (python#3449)
  ...
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2 participants