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VS Code python extension will modify my data in Python script when i debug with it

See original GitHub issue

Environment data

VS Code version: 1.19.3
Extension version (available under the Extensions sidebar): 2018.4.0 (2 May 2018)
OS and version: windows 10
Python version (& distribution if applicable, e.g. Anaconda): python 3.5.2
Type of virtual environment used (N/A | venv | virtualenv | conda | …): N/A
Relevant/affected Python packages and their versions: XXX

the VS Code IDE will modify my property in Python script when i debug with it. my test code as below

bytesIO = io.BytesIO(...)
bytesIO.seek(0)
print(bytesIO.realine()) # will output the first line

Actual behavior

print(bytesIO.readline()) output nothing.

Expected behavior

print(bytesIO.readline()) will output the first line.

if i add bytesIO.seek(0) after i watch the variable by vs code ide, the output is right. I wander if the IDE has modified the data inside the bytesIO object, such as it called its iterator and changed the position flag inside the object.

hope it helps!

Issue Analytics

State:
Created 5 years ago
Comments:8 (5 by maintainers)

Top GitHub Comments

1reaction

karthiknadigcommented, Jul 10, 2018

If an object implements __iter__ and is NOT an instance of following collection types: list, tuple, bytearray, range, dict, set, frozenset, xrange, buffer, only then we don`t consume the iterator (while building the repr).

0reactions

brettcannoncommented, Nov 8, 2018

Because we have not heard back with the information we requested, we are closing this issue for now. If you are able to provide the info later on then we will be happy to re-open this issue to pick up where we left off.

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