GCCollector raises an exception in PyPy7.0/Python3.5

[zcarlson-signifai]

When attempting to import prometheus_client in the PyPy 7.0 runtime with the Python 3.5 language implementation, the following exception is raised:

(prometheus-client) [zcarlson@eleusinia-forge prometheus-client]$ python
Python 3.5.3 (928a4f70d3de7d17449456946154c5da6e600162, Feb 09 2019, 11:50:43)
[PyPy 7.0.0 with GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>> import prometheus_client
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/zcarlson/Code/prometheus-client/env/pypy7.0-python3.5/site-packages/prometheus_client/__init__.py", line 5, in <module>
    from . import gc_collector
  File "/home/zcarlson/Code/prometheus-client/env/pypy7.0-python3.5/site-packages/prometheus_client/gc_collector.py", line 46, in <module>
    GC_COLLECTOR = GCCollector()
  File "/home/zcarlson/Code/prometheus-client/env/pypy7.0-python3.5/site-packages/prometheus_client/gc_collector.py", line 17, in __init__
    registry.register(self)
  File "/home/zcarlson/Code/prometheus-client/env/pypy7.0-python3.5/site-packages/prometheus_client/registry.py", line 24, in register
    names = self._get_names(collector)
  File "/home/zcarlson/Code/prometheus-client/env/pypy7.0-python3.5/site-packages/prometheus_client/registry.py", line 64, in _get_names
    for metric in desc_func():
  File "/home/zcarlson/Code/prometheus-client/env/pypy7.0-python3.5/site-packages/prometheus_client/gc_collector.py", line 37, in collect
    for generation, stat in enumerate(gc.get_stats()):
TypeError: 'GcStats' object is not iterable

I believe this is because pypy has a different GC from stock CPython, and thus gc_stats() returns different information.

prometheus_client 0.5.0 seems to work, however, from initial testing...

[brian-brazil]

Our CI should have caught that as we test on pypy, guess we also need a new test.

[Krukov]

There are no CI jobs with pypy with 3,7 . Only with 2,7
https://travis-ci.org/prometheus/client_python/jobs/495991719

[patallen]

Also is failing with same error on PyPy 6.0 Python 2.7.13

[oberstet]

pip install "prometheus_client==0.5.0" works on PyPy 7

[glyph]

Still failing with this error on PyPy 7.1.1.

[brian-brazil]

That doesn't sound right, we no longer use this code on PyPy. Can you confirm you're still seeing this?

[glyph]

@brian-brazil You're … right? I am not sure what versions I was testing with when I made the previous comment, but with pypy3-7.1.1 and prometheus_client==0.7.1, it now imports without emitting a traceback. Sorry for the false alarm!

[glyph]

@zcarlson-signifai Should this be closed?