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Update error examples in documentation #3404

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Update error examples in documentation #3404

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8e4296b
use actual error messages when giving examples
vilmibm May 22, 2017
9a32a15
add section on variable type declaration
vilmibm May 22, 2017
94aa1ba
minor whitespace/punctuation changes
vilmibm May 22, 2017
49ec476
Favor pre 3.6 variable type annotation
vilmibm May 23, 2017
208ced4
finish auditing errors in docs
vilmibm May 23, 2017
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minor whitespace/punctuation changes
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vilmibm committed May 22, 2017
commit 94aa1baf1669139fa2d2564ecf13d91d739f07eb
6 changes: 2 additions & 4 deletions docs/source/common_issues.rst
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Expand Up @@ -123,20 +123,18 @@ Types of empty collections
--------------------------

You often need to specify the type when you assign an empty list or
dict to a new variable.
dict to a new variable:

.. code-block:: python

a = [] # error: Need type annotation for variable


Without the annotation mypy can't always figure out the precise type of ``a``.
Without an annotation mypy can't always figure out the precise type of ``a``.

.. code-block:: python

a: List[int] = []


You can use a simple empty list literal in a dynamically typed function (as the
type of ``a`` would be implicitly ``Any`` and need not be inferred), if type
of the variable has been declared or inferred before, or if you perform a simple
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