installing qrcode 6.0 error

[jianaijun]

In 5.3, everything worked fine,
An error occurred installing qrcode 6.0:

zip_safe flag not set; analyzing archive contents...
Installing qrcode 6.0
Caused installation of a distribution:
UNKNOWN 0.0.0
with a different project name.
Installing qrcode 6.0
Caused installation of a distribution:
UNKNOWN 0.0.0
with a different version.
Got None.
Error: There is a version conflict.
We already have: UNKNOWN 0.0.0

[llazzaro]

I have the same error. Which python version did yo use?

Adding more info:
this could be related: pypa/setuptools#1787

I noted that python_requires = >= 3.6 is missing in the [options] section of the setup.cfg

installing with pip succeded