New submission from Michael Foord:
mock_open returns a mock object suitable for using as a mock file handle. File
handles support iteration, so mock_open should support that. If possible it
should be integrated with the current read/readlines support (only if
possible), so the suggested patch may not be enough.
1. Want to mock this:
with open(source_file, 'r') as f:
for line_num, line_text in enumerate(f):
print line_text
2. Tried this:
with patch('__builtin__.open', mock_open(read_data='text'), create=True) as p:
3. enumerate causes a call to __iter__() which is not handled by the mock_open
code.
What is the expected output? What do you see instead?
The __iter__ is allowed on the returned file handle
What version of the product are you using? On what operating system?
latest
Please provide any additional information below.
Patch would have mock_open setup handle.__iter__.return_value to a passed in
parm or if none, possibly a iter(StringIO(read_data)) on the existing read_data
parm to keep the interface unchanged.
----------
assignee: michael.foord
components: Library (Lib)
files: 213.patch
keywords: patch
messages: 216522
nosy: kushal.das, michael.foord
priority: normal
severity: normal
stage: patch review
status: open
title: Add __iter__ support for mock_open
type: behavior
versions: Python 3.5
Added file: http://bugs.python.org/file34917/213.patch
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<http://bugs.python.org/issue21258>
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