TypeError: __init__() got an unexpected keyword argument 'timeLimit'

[oalotaik]

Hello there,

whenever I call the solve method, e.g. prob.solve(), I get this error. See below for more details

TypeError Traceback (most recent call last)
in
----> 1 prob.solve()

c:\python371\lib\site-packages\vrpy\vrp.py in solve(self, initial_routes, preassignments, pricing_strategy, cspy, exact, time_limit, solver, dive, greedy, max_iter, run_exact, heuristic_only)
252 self._initialize(solver)
253 # Column generation procedure
--> 254 self._solve(dive, solver)
255
256 @Property

c:\python371\lib\site-packages\vrpy\vrp.py in _solve(self, dive, solver)
491
492 def _solve(self, dive, solver):
--> 493 self._column_generation()
494 if dive:
495 self._dive = True

c:\python371\lib\site-packages\vrpy\vrp.py in _column_generation(self)
514 while self._more_routes:
515 # Generate good columns
--> 516 self._find_columns()
517 # Stop if time limit is passed
518 if (

c:\python371\lib\site-packages\vrpy\vrp.py in _find_columns(self)
539 else:
540 duals, relaxed_cost = self.masterproblem.solve(
--> 541 relax=True, time_limit=self._get_time_remaining()
542 )
543 logger.info("iteration %s, %.6s" % (self._iteration, relaxed_cost))

c:\python371\lib\site-packages\vrpy\master_solve_pulp.py in solve(self, relax, time_limit)
43
44 def solve(self, relax, time_limit):
---> 45 self._solve(relax, time_limit)
46 logger.debug("master problem relax %s" % relax)
47 logger.debug("Status: %s" % pulp.LpStatus[self.prob.status])

c:\python371\lib\site-packages\vrpy\master_solve_pulp.py in _solve(self, relax, time_limit)
202 msg=False,
203 timeLimit=time_limit,
--> 204 options=["startalg", "barrier", "crossover", "0"],
205 )
206 )

c:\python371\lib\site-packages\pulp\apis\coin_api.py in init(self, path, *args, **kwargs)
269 raise PulpSolverError('Use COIN_CMD if you want to set a path')
270 #check that the file is executable
--> 271 COIN_CMD.init(self, path=self.pulp_cbc_path, *args, **kwargs)
272
273 def COINMP_DLL_load_dll(path):

TypeError: init() got an unexpected keyword argument 'timeLimit'

[oalotaik]

I tried older versions as well and I still get this error. Is it just me? No one else seems to have this problem.
I thought about editing the source code but it's a terrifying idea.

I hope someone knows what's going on here

[torressa]

I think you're using an old PuLP version.
The line raising the Exception is no longer there (https://github.com/coin-or/pulp/blob/master/pulp/apis/coin_api.py#L270) please try upgrading PuLP to the latest version.

[oalotaik]

Thanks a lot, David.
You are correct. Upgrading PuLP solved my problem.