8000 Solver fails if TMPDIR includes a space · Issue #811 · coin-or/pulp · GitHub
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Solver fails if TMPDIR includes a space #811

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saizai opened this issue Mar 15, 2025 · 2 comments
Open
3 of 15 tasks

Solver fails if TMPDIR includes a space #811

saizai opened this issue Mar 15, 2025 · 2 comments

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@saizai
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saizai commented Mar 15, 2025

Details for the issue

What did you do?

Run pulp with environment TMP="/Volumes/RAM Disk/"

What did you expect to see?

Results

What did you see instead?

Usage: gurobi_cl [--command]* [param=value]* filename
Type 'gurobi_cl --help' for more information.
Traceback (most recent call last):
  [redacted]
  File [redacted]
    problem.solve(pulp.GUROBI_CMD(threads=16, timeLimit=600))
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "[redacted]/Python/3.13/lib/python/site-packages/pulp/pulp.py", line 1996, in solve
    status = solver.actualSolve(self, **kwargs)
  File "[redacted]/Python/3.13/lib/python/site-packages/pulp/apis/gurobi_api.py", line 494, in actualSolve
    lp.assignVarsVals(values)
    ~~~~~~~~~~~~~~~~~^^^^^^^^
  File "[redacted]/Python/3.13/lib/python/site-packages/pulp/pulp.py", line 1918, in assignVarsVals
    for name in values:
                ^^^^^^
TypeError: 'NoneType' object is not iterable

Fix

Run pulp with environment TMP="/Volumes/RAMDisk/" (no space)

See e.g.

pulp/pulp/apis/gurobi_api.py

Lines 463 to 471 in ebbbfde

cmd += f" ResultFile={tmpSol}"
if self.optionsDict.get("warmStart", False):
self.writesol(filename=tmpMst, vs=vs)
cmd += f" InputFile={tmpMst}"
if lp.isMIP():
if not self.mip:
warnings.warn("GUROBI_CMD does not allow a problem to be relaxed")
cmd += f" {tmpLp}"
which fail to quote the file names. Probably true for other APIs too.

Useful extra information

The info below often helps, please fill it out if you're able to. :)

What operating system are you using?

  • Windows: ( version: ___ )
  • Linux: ( distro: ___ )
  • Mac OS: ( version: ___ )
  • Other: ___

I'm using python version:

  • 3.7
  • 3.8
  • 3.9
  • 3.10
  • 3.11
  • Other: 3.13.2

I installed PuLP via:

Did you also
@pchtsp
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pchtsp commented Mar 17, 2025 •
edited
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Is there anything we can do from the pulp side? such as escaping the paths or something? Let me know. Even better, submit a PR if you think you know how to fix it.

@saizai
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saizai commented Mar 17, 2025

My Python skills aren't good enough to make the PR myself, but e.g. in the lines I cite, the file names/paths should be shell-escaped and shell-quoted before being added to options on the shell cmd

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