Failed: pip install -r requirements.txt - can't parse python_version clause

Question

I'm trying to install SAIO as http://docs.openstack.org/developer/swift/development_saio.html#common-dev-section

when I nuild a development installation of swift by

pip install -r requirements.txt

I got this error:

Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 262, in run
    for req in parse_requirements(filename, finder=finder, options=options, session=session):
  File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1632, in parse_requirements
    req = InstallRequirement.from_line(line, comes_from, prereleases=getattr(options, "pre", None))
  File "/usr/lib/python2.7/dist-packages/pip/req.py", line 173, in from_line
    return cls(req, comes_from, url=url, prereleases=prereleases)
  File "/usr/lib/python2.7/dist-packages/pip/req.py", line 71, in __init__
    req = pkg_resources.Requirement.parse(req)
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2667, in parse
    reqs = list(parse_requirements(s))
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2605, in parse_requirements
    line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2583, in scan_list
    "Expected ',' or end-of-list in",line,"at",line[p:]
ValueError: ("Expected ',' or end-of-list in", "dnspython3>=1.12.0;python_version<'3.0'", 'at', ";python_version<'3.0'")

Storing debug log for failure in /root/.pip/pip.log

here is my requirement.txt

dnspython3>=1.12.0;python_version<'3.0'
dnspython3>=1.12.0;python_version>='3.0'
eventlet>=0.17.4  # MIT
greenlet>=0.3.1
netifaces>=0.5,!=0.10.0,!=0.10.1
pastedeploy>=1.3.3
six>=1.9.0
xattr>=0.4
PyECLib>=1.2.0                          # BSD

Please, edit your question and paste the content of the requirement.txt file. — Yasel, Mar 14 '16 at 02:41
Why do you have multiple lines of `dnspython3`? They are the same version for both python 2 and 3 — OneCricketeer, Mar 14 '16 at 03:27
Possible duplicate of [requirements.txt depending on python version](http://stackoverflow.com/questions/19559247/requirements-txt-depending-on-python-version) — ivan_pozdeev, Mar 14 '16 at 03:28
please comment the first two line and run it i mean to say this two line dnspython3>=1.12.0;python_version<'3.0' dnspython3>=1.12.0;python_version>='3.0' — Janarthanan Ramu, Nov 02 '17 at 07:40

score 0 · Answer 1 · answered Mar 14 '16 at 05:39

0

The support for Environment Markers was added on pip version 6.0, you might have an older version. You can upgrade pip using:

pip install --upgrade pip

answered Mar 14 '16 at 05:39

Forge

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Dear Forge , Thanks for your reply. I already upgrade pip as your guide and tried again but still get this error :( – Nguyen Diep Mar 14 '16 at 06:04
1

@NguyenDiep could you please share the output of `pip --version`? – Forge Mar 14 '16 at 12:19

score 0 · Answer 2 · answered Jun 30 '16 at 14:37

Same problem for me and I cannot upgrade pip with the command given by @Forge:

pip install --upgrade pip


root@1c86632c84e6:/# pip install --upgrade pip 
Downloading/unpacking pip from https://pypi.python.org/packages/9c/32/004ce0852e0a127f07f358b715015763273799bd798956fa930814b60f39/pip-8.1.2-py2.py3-none-any.whl#md5=0570520434c5b600d89ec95393b2650b
  Downloading pip-8.1.2-py2.py3-none-any.whl (1.2MB): 1.2MB downloaded
Installing collected packages: pip
  Found existing installation: pip 1.5.4
    Not uninstalling pip at /usr/lib/python2.7/dist-packages, owned by OS
Successfully installed pip
Cleaning up...
root@1c86632c84e6:/# pip --version 
pip 1.5.4 from /usr/lib/python2.7/dist-packages (python 2.7)

I wonder if unstalling pip with pip should work ...

The crucial line here is `Not uninstalling pip at /usr/lib/python2.7/dist-packages, owned by OS`. There are several ways around this issue, with the recommended way being to use `virtualenv` to create an isolated Python environment and update its version of `pip`. — taleinat, Jun 30 '16 at 14:41

Failed: pip install -r requirements.txt - can't parse python_version clause

2 Answers2