IronLanguages/ironpython3

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Implementation of Python 3.x for .NET Framework that is built on top of the Dynamic Language Runtime.

Stars: 2.8k
Forks: 316
Open beginner issues: 0
Indexed issues: 302
Avg merge: 1d 9h
Merged PRs (30d): 1

Dominant language: C#
License: Apache-2.0
Last GitHub push: Aug 31, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

302 open issues indexed

threads are not GCed on Mono Open

Mono testing

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#1005 · Opened Oct 30, 2020
dynamic binding issue with _io.BytesIO/_io.StringIO Open

module-io

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#1004 · Opened Oct 28, 2020
attribute dict of _io._IOBase and of user-defined subclasses are not the same Open

module-io

Difficulty 3/5 1-2 days Newbie friendliness 55/100

IronLanguages/ironpython3#1003 · Opened Oct 28, 2020
Replace io.BytesIO backing buffer with ArrayData<byte> Open

module-io

Difficulty 4/5 3-5 days Newbie friendliness 45/100

IronLanguages/ironpython3#1002 · Opened Oct 28, 2020
__radd__ should not be on str and list Open

CPython compatibility testing

Difficulty 3/5 1-2 days Newbie friendliness 45/100

IronLanguages/ironpython3#996 · Opened Oct 22, 2020
__dir__ does not appear in dir(anything) Open

CPython compatibility testing

Difficulty 3/5 1-2 days Newbie friendliness 45/100

IronLanguages/ironpython3#995 · Opened Oct 22, 2020
__del__ method is not called Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#985 · 3 comments · Opened Oct 15, 2020
Some operations not returning boxed small ints Open

CPython compatibility testing

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#975 · Opened Oct 11, 2020
NotParallelSafe doesn't work with Mono Open

Mono

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#946 · Opened Sep 23, 2020
FileIO, BufferedWriter left unflushed when ipy exits Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

IronLanguages/ironpython3#938 · 2 comments · Opened Aug 31, 2020
Investigate using native ints for n/N in struct Open

module-struct

Difficulty 4/5 3-5 days Newbie friendliness 30/100

IronLanguages/ironpython3#934 · Opened Aug 18, 2020
Failure in test_collections during CI Open

testing

Difficulty 3/5 1-2 days Newbie friendliness 42/100

IronLanguages/ironpython3#925 · 1 comment · Opened Aug 10, 2020
Failure in test_defaultdict during CI Open

testing

Difficulty 3/5 1-2 days Newbie friendliness 25/100

IronLanguages/ironpython3#921 · Opened Aug 6, 2020
EngineTest.ScenarioInterpreterNestedVariables is failing on .NET Core Open

.NET Core

Difficulty 4/5 3-5 days Newbie friendliness 30/100

IronLanguages/ironpython3#908 · Opened Jul 4, 2020
long to float conversion not choosing closest float Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#907 · Opened Jul 4, 2020
EngineTest.ScenarioStreamRedirect fails with a LookupException Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#906 · 1 comment · Opened Jul 2, 2020
EngineTest.ScenarioHostingHelpers fails with a SerializationException Open

.NET Framework

Difficulty 4/5 3-5 days Newbie friendliness 25/100

IronLanguages/ironpython3#904 · Opened Jul 2, 2020
Partial trust is broken by use of Span Open

.NET Framework

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#898 · Opened Jun 28, 2020
.NET arrays bind to params arrays Open

.NET interop regression

Difficulty 3/5 1-2 days Newbie friendliness 35/100

IronLanguages/ironpython3#892 · 1 comment · Opened Jun 17, 2020
Assemblies loading multiple times with .NET Core Open

.NET Core

Difficulty 4/5 3-5 days Newbie friendliness 30/100

IronLanguages/ironpython3#886 · Opened Jun 10, 2020
Implement IReadOnlyDictionary on PythonDictionary Open

good first issue

Difficulty 4/5 3-5 days Newbie friendliness 20/100

IronLanguages/ironpython3#883 · 2 comments · 1 reaction · Opened Jun 7, 2020
Exception context not set for invalid except expression Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

IronLanguages/ironpython3#878 · Opened Jun 5, 2020
OSError.__init__ should do nothing Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#876 · Opened Jun 4, 2020
Get rid of sys._exitfunc Open

good first issue module-sys

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#874 · Opened Jun 4, 2020
Allow memoryview of .NET arrays Open

.NET interop

Difficulty 5/5 Over a week Newbie friendliness 35/100

IronLanguages/ironpython3#872 · 7 comments · Opened Jun 4, 2020
Implement marshal versions 3 and 4 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#871 · Opened Jun 3, 2020
Overload resolver incorrectly resolves when both 32 and 64-bit parameter type present Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

IronLanguages/ironpython3#868 · 5 comments · Opened Jun 1, 2020
_string.formatter_parser differences with CPython Open

CPython compatibility

Difficulty 4/5 3-5 days Newbie friendliness 30/100

IronLanguages/ironpython3#867 · Opened May 31, 2020
Creating a set from a dict rehashes the keys Open

CPython compatibility

Difficulty 3/5 1-2 days Newbie friendliness 45/100

IronLanguages/ironpython3#848 · Opened May 23, 2020
upper/lower/capitalize do not use the default case algorithm Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

IronLanguages/ironpython3#839 · 1 comment · Opened May 19, 2020
clrtype requires __metaclass__ Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

IronLanguages/ironpython3#836 · Opened May 17, 2020
Review PythonOps.TryGetBoundAttr usage Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#790 · Opened Apr 18, 2020
how can i release Scope when i reuse ScriptEngine Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

IronLanguages/ironpython3#772 · Opened Mar 24, 2020
test_array failures Open

testing

Difficulty 3/5 1-2 days Newbie friendliness 35/100

IronLanguages/ironpython3#767 · Opened Mar 12, 2020
ast.parse produces different (lineno, col_offset) in some cases Open

core CPython compatibility

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#746 · Opened Feb 25, 2020
Update WithStatement ast to match CPython Open

CPython compatibility What's New In Python 3.3

Difficulty 4/5 3-5 days Newbie friendliness 45/100

IronLanguages/ironpython3#745 · 1 comment · Opened Feb 25, 2020
Exception traceback not preserved Open

What's New In Python 3.0

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#738 · Opened Feb 16, 2020
traceback incorrect with contextlib.contextmanager Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

IronLanguages/ironpython3#736 · 2 comments · Opened Feb 14, 2020
CJK codecs are incomplete. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#716 · 2 comments · Opened Jan 4, 2020
Update unicodedata module Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

IronLanguages/ironpython3#691 · 4 comments · Opened Dec 2, 2019
Implement methods on binascii Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#673 · 1 comment · Opened Nov 9, 2019
Cascading exceptions not properly reported Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#667 · Opened Oct 31, 2019
Incorrect error message when calling function with invalid signature Open

CPython compatibility

Difficulty 4/5 3-5 days Newbie friendliness 42/100

IronLanguages/ironpython3#658 · 2 comments · Opened Oct 22, 2019
nt.spawnv doesn't properly escape quotes Open

module-os

Difficulty 3/5 1-2 days Newbie friendliness 35/100

IronLanguages/ironpython3#648 · 1 comment · Opened Oct 18, 2019
urllib.parse.urlsplit not raising a ValueError for certain characters Open

Mono

Difficulty 3/5 1-2 days Newbie friendliness 48/100

IronLanguages/ironpython3#614 · Opened May 1, 2019
On posix socket.fileno should be a file descriptor Open

module-socket posix

Difficulty 3/5 1-2 days Newbie friendliness 45/100

IronLanguages/ironpython3#581 · Opened Mar 22, 2019
time.localtime() reports local time 1 hour later than actual Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#570 · Opened Mar 10, 2019
Equality between bytes/bytearray and Array[Byte]/List[Byte] no longer works Open

.NET interop

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#568 · Opened Mar 8, 2019
LocalsDictionary not generated in certain cases Open

core

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#562 · 1 comment · Opened Mar 4, 2019
Concatenating a sequence with another type may not work as expected Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

IronLanguages/ironpython3#560 · 3 comments · Opened Mar 2, 2019

IronLanguages/ironpython3

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