Setup.py fails for pip>=20.1

[scottandrews]

Environment
Conda virtual environment
pip version: 20.1
Python version: 3.7.6
OS: Mac Catalina 10.15.4

Steps to Reproduce
Install anaconda 3.7.6
pip install chumpy

Output

  Using cached chumpy-0.69.tar.gz (50 kB)
    ERROR: Command errored out with exit status 1:
     command: /Users/sandrews/.virtualenvs/py37cv4/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/d7/jhs0m4vn3k9bk6dy201nrbcw0000gn/T/pip-install-klqvusum/chumpy/setup.py'"'"'; __file__='"'"'/private/var/folders/d7/jhs0m4vn3k9bk6dy201nrbcw0000gn/T/pip-install-klqvusum/chumpy/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/d7/jhs0m4vn3k9bk6dy201nrbcw0000gn/T/pip-pip-egg-info-9uh6xoy2
         cwd: /private/var/folders/d7/jhs0m4vn3k9bk6dy201nrbcw0000gn/T/pip-install-klqvusum/chumpy/
    Complete output (7 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/d7/jhs0m4vn3k9bk6dy201nrbcw0000gn/T/pip-install-klqvusum/chumpy/setup.py", line 15, in <module>
        install_requires = [str(ir.req) for ir in install_reqs]
      File "/private/var/folders/d7/jhs0m4vn3k9bk6dy201nrbcw0000gn/T/pip-install-klqvusum/chumpy/setup.py", line 15, in <listcomp>
        install_requires = [str(ir.req) for ir in install_reqs]
    AttributeError: 'ParsedRequirement' object has no attribute 'req'
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.```

[gayalkuruppu]

Environment

virtualenv virtual environment
pip version: 20.1
Python version: 3.7
OS: Debian GNU/Linux 9 (stretch)

Steps to Reproduce
pip install chumpy

Output

  Using cached chumpy-0.69.tar.gz (50 kB)
    ERROR: Command errored out with exit status 1:
     command: /home/Gayal/TF_FLAME/my_venv/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-l8jmoloi/chumpy/setup.py'"'"'; __file__='"'"'/tmp/pip-install-l8jmoloi/chumpy/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-5mq7h_yi
         cwd: /tmp/pip-install-l8jmoloi/chumpy/
    Complete output (7 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-l8jmoloi/chumpy/setup.py", line 15, in <module>
        install_requires = [str(ir.req) for ir in install_reqs]
      File "/tmp/pip-install-l8jmoloi/chumpy/setup.py", line 15, in <listcomp>
        install_requires = [str(ir.req) for ir in install_reqs]
    AttributeError: 'ParsedRequirement' object has no attribute 'req'
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

Tried chumpy previous versions and downto 0.66, no version worked. Then they were not compatible with my tasks.

UPDATE

Tried on ubuntu 16.04. does not work either. works fine on macos. but I need tf-gpu but I dont have gpus on my mac(currently running debian 9 on GCP)

[gayalkuruppu]

Okay it worked sorry for the trouble

[gormonn]

@gayalkuruppu how it works? Please tell more.

[gormonn]

it works to install chumpy, for me:
pip install --force-reinstall pip==19

[gayalkuruppu]

@gayalkuruppu how it works? Please tell more.

sorry I have added the original gt repo earlier. Following works fine.
pip install git+https://github.com/scottandrews/chumpy.git

[Andrej730]

Still an issue for me to install chumpy either with pip install git+https://github.com/mattloper/chumpy.git or pip install chumpy. #41 solves the problem for me.

Fast solution for now is to install it with https://github.com/scottandrews/chumpy/commit/fe51783e0364bf1e9b705541e7d77f894dd2b1ac:
pip install git+https://github.com/scottandrews/chumpy.git@fe51783e0364bf1e9b705541e7d77f894dd2b1ac

[r4ghu]

PR #42 solves the issue.

[tusharmagrawal]

the force reinstall option worked for me too

[duanying98]

AttributeError: 'Ch' object has no attribute '_dirty_vars'
why?