[New-bugs-announce] [issue18200] Update stdlib to use ModuleNotFoundError

[Brett Cannon]

New submission from Brett Cannon:

The common idiom::

 try:
  import something
 except ImportError:
  pass

should be updated to use ModuleNotFoundError instead to not accidentally swallow ImportError exceptions which signal actual errors.

----------
components: Library (Lib)
keywords: easy
messages: 191047
nosy: brett.cannon
priority: normal
severity: normal
stage: needs patch
status: open
title: Update stdlib to use ModuleNotFoundError
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18200>
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