Error in --outdated and --uptodate parameters from pip list

[Duerno]

Environment

• pip version: 9.0.1-2.3
• Python version: 3.6.7-1
• OS: Debian GNU/Linux buster/sid
• apt package: python3-pip

Description

I receive an error every time I run pip3 list --outdated, and I receive no output after running pip3 list --uptodate.

Expected behavior

A list of outdated python packages, example for pip3 list --outdated:

package001 (1.14.5) - Latest: 1.15.4 [wheel]
package002 (9.0.1) - Latest: 18.1 [wheel]

And example for pip3 list --uptodate:

package003 (40.6.2)
package004 (16.1.0)

How to Reproduce

outdated:

1. Get pip3 package from 'apt install python3-pip' with sudo
2. Then run pip3 list --outdated
3. A TypeError exception raises.

uptodate:

1. Get pip3 package from 'apt install python3-pip' with sudo
2. Then run pip3 list --uptodate
3. Nothing appers and the command ends.

Output

After running pip3 list --outdated, the following exception raises:

Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/list.py", line 157, in run
    packages = self.get_outdated(packages, options)
  File "/usr/lib/python3/dist-packages/pip/commands/list.py", line 174, in get_outdated
    if dist.latest_version > dist.parsed_version:
TypeError: '>' not supported between instances of 'Version' and 'Version'

By adding some prints at the source code, I found that the two objects being compared are instances of <class 'pip._vendor.packaging.version.Version'> and <class 'pkg_resources.extern.packaging.version.Version'> respectively.

And after running pip3 list --uptodate, nothing appears. The objects being compared follow the same pattern as described above.

[starkblitz]

I am getting the same error on Ubuntu 18.04 on my WSL(Windows Subsystem for Linux).

[yan12125]

Most likely this is the same issue as #5429.

[chrahunt]

I agree, this looks like the same issue. Thanks @yan12125.

If this seems incorrect, please let us know.