Invalid `dev` version identifiers in `setup.py`

[con-f-use]

There is a bunch of invalid version matchers (edit: valid, but not parsed correctly by distlib) in setup.py. PEP 440 states:

The canonical public version identifiers MUST comply with the following scheme:
[N!]N(.N)*[{a|b|rc}N][.postN][.devN]

So you are missing a dot and a number in every version identifier that contains the string dev.

It is also considered bad practice to have an upper bound on package versions and installers like pip do not typically consider development versions in any case (unless explicitly told to).

See: googleapis/google-api-python-client#2151

[con-f-use]

Discussion in: googleapis/python-api-core#504