A Python interface to OPL.
Welcome to the IBM® OPL connector for Python. Licensed under the Apache License v2.0.
With this library, you can quickly and easily add the power of optimization to your Python application. You can model your problems by using the OPL language and IDE, and integrate it in Python via Python/pandas/sql alchemy inputs/outputs.
Solving with CPLEX requires that IBM® ILOG CPLEX Optimization Studio V12.8.0 is installed on your machine.
Install the library
pip install doopl
Get the examples
Get your IBM® ILOG CPLEX Optimization Studio edition
This library is delivered under the Apache License Version 2.0, January 2004 (see LICENSE.txt).
The API is very compact and simple. You must have the OPL binaries in your PATH/LD_LIBRARY_PATH or DYLD_LIBRARY_PATH, depending on your platform. They are located in <cplex_studio_dir>/opl/bin/<platform> where:
- cplex_studio_dir is the installation directory of CPLEX 12.8
- platform is your plaform (OPL nomenclature, that is x64_win64, x86-64_linux or x86-64_osx)
Here is small sumup of the capabilities:
- Inputs can be tuple lists, panda’s dataframe, sql alchemy fetch statements.
- Generate, solve and get output tuplesets as panda’s dataframe
- Get the CPLEX problem statistics and quality metrics for the solution
- Convert all integer variables to floating point variables and vice-versa.
- Run the conflict/relaxation mechanism.
- Call the ‘RunSeed’ diagnosis for CPLEX/CPO based problems.
Each of these features are demonstrated with simple examples.
Here is a small example to start working with the API:
from doopl.factory import * # Create an OPL model from a .mod file with create_opl_model(model="file.mod") as opl: # tuple can be a list of tuples, a pandas dataframe... opl.set_input("TupleSet1", tuples) # Generate the problem and solve it. opl.run() # Get the names of post processing tables print("Table names are: "+ str(opl.output_table_names)) # Get all the post processing tables as dataframes. for name, table in iteritems(opl.report): print("Table : " + name) for t in table.itertuples(index=False): print(t)
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