It seems that:

F25 has =>  python-multidict-1.1.0-1.fc25.1

F26 (rawhide) has => python-multidict-2.1.1-1.fc26

Gns3 seems require a multidict version >= 1.2.2 and < 2, but F25 has version 1.1.0 while F26 has version 2.1.1-1...

@Andrea: gns3-server or -gui does not depend directly on python-multidict, it depends on python3-aiohttp which depends on python3-multidict

Another example is xcat package


$ xcat
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 635, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 943, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 834, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (multidict 1.1.0 (/usr/lib64/python3.5/site-packages), Requirement.parse('multidict<2,>=1.2.2'), {'aiohttp'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/xcat", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 2958, in <module>
    @_call_aside
  File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 2944, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 2971, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 637, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 650, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 829, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'multidict<2,>=1.2.2' distribution was not found and is required by aiohttp

I have the same problem

gns3server Error:
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'multidict<2,>=1.2.2' distribution was not found and is required by aiohttp



release :
fedora 25 x86_64

gns3vserver version :
gns3-server-1.5.1-1.fc25.noarch

python3-aiohttp version :
python3-aiohttp-0.22.5-1.fc25.x86_64

python3-multidict version :
python3-multidict-1.1.0-1.fc25.1.x86_64

cat /usr/lib/python3.5/site-packages/gns3_server-1.5.1-py3.5.egg-info/requires.txt
:
jsonschema>=2.4.0
aiohttp>=0.21.5
Jinja2>=2.7.3
raven>=5.2.0
psutil>=3.0.0
zipstream>=1.1.3

I see that fab upgraded python-aiohttp to version 1.0.5: http://koji.fedoraproject.org/koji/packageinfo?packageID=19224

This updated the python-multidict dependency to >= 2.0.

Unfortunately, python-multidict is version 1.1.0 in Fedora 24 and Fedora 25.  It's only version 2.1.1 in Fedora 26: http://koji.fedoraproject.org/koji/packageinfo?packageID=22601

We either need to update python-multidict in Fedora 24 and 25 to 2.1.1 (might be okay... dnf repoquery tells me that python-aiohttp is the only package in fedora that requires python-multidict) or downgrade python-aiohttp and upgrade python-multidict to a version greater than 1.2.2.

Currently aiohttp is entirely broken (not just in packages which use egg-info) because multidict 2.x renames upstr to istr.  aiohttp 1.0.5 uses the new, istr name which isn't found in the version of python-multidict that we're shipping:

>>> import aiohttp
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python3.5/site-packages/aiohttp/__init__.py", line 9, in <module>
    from . import hdrs  # noqa
  File "/usr/lib64/python3.5/site-packages/aiohttp/hdrs.py", line 2, in <module>
    from multidict import istr
ImportError: cannot import name 'istr'

CC'ing the python-ultidict maintainer so the package maintainers can work out what to do.

1.0.5 has also a dependency on async_timeout which is not available in Fedora afaik.

$ cat /usr/lib64/python3.5/site-packages/aiohttp-1.0.5-py3.5.egg-info/requires.txt
chardet
multidict>=2.0
async_timeout
^^^^^^^^^^^^^

I built (building) python-multidict-2.1.2 for F24 / F25, so once you are done with other package -- feel free to submit update for multidict.

I've submitted async_timeout for review RHBZ #1394250

multidict is available on F24/F25.