type error occur when using bid file

[WhitejadeHang]

When I add costcurvepointsfilename in generator , the console throw out this:
Traceback (most recent call last):
File "/root/miniconda3/bin/minpower", line 8, in
sys.exit(main())
File "/root/miniconda3/lib/python3.8/site-packages/minpower/solve.py", line 309, in main
solve_problem(directory)
File "/root/miniconda3/lib/python3.8/site-packages/minpower/solve.py", line 157, in solve_problem
solution = create_solve_problem(power_system, times, scenario_tree)
File "/root/miniconda3/lib/python3.8/site-packages/minpower/solve.py", line 223, in create_solve_problem
sln = results.make_solution(power_system, times)
File "/root/miniconda3/lib/python3.8/site-packages/minpower/results.py", line 84, in make_solution
return problem_type[kind](power_system, times, **kwargs)
File "/root/miniconda3/lib/python3.8/site-packages/minpower/results.py", line 116, in init
self._get_costs()
File "/root/miniconda3/lib/python3.8/site-packages/minpower/results.py", line 166, in _get_costs
self.incremental_cost = self.gen_time_df("incrementalcost")
File "/root/miniconda3/lib/python3.8/site-packages/minpower/results.py", line 147, in gen_time_df
[self.get_values(generators, method, t, evaluate) for t in times],
File "/root/miniconda3/lib/python3.8/site-packages/minpower/results.py", line 147, in
[self.get_values(generators, method, t, evaluate) for t in times],
File "/root/miniconda3/lib/python3.8/site-packages/minpower/results.py", line 135, in get_values
out = [value(getattr(obj, method)(time)) for obj in items]
File "/root/miniconda3/lib/python3.8/site-packages/minpower/results.py", line 135, in
out = [value(getattr(obj, method)(time)) for obj in items]
File "/root/miniconda3/lib/python3.8/site-packages/minpower/generators.py", line 166, in incrementalcost
self.bids.output_incremental(self.power(time, scenario))
File "/root/miniconda3/lib/python3.8/site-packages/minpower/bidding.py", line 146, in output_incremental
if A[0] <= input_val <= B[0]:
TypeError: '<=' not supported between instances of 'str' and 'float'

it seems that the output_incremental function picks up wrong data from the raw file using:
for A, B in pairwise(self.bid_points):
should use:
for A, B in pairwise(self.bid_points.values.tolist()):
instead

[adamgreenhall]

Your suggestion makes sense. Feel free to open a PR!