Python API examples

This section lists a few examples in Python. These are the same files that can be found in the examples directory of the distribution, and show the basic usage of the Python API.

Example 1: First steps

firstexample.py

This example shows how to

• read an AMPL model
• reassign values to parameters
• solve the model
• display the objective function value

Example 2: Get and set AMPL options

optionsexample.py

This example shows how to:

• get and set AMPL options

Example 3: Use AMPL asynchronously

asyncexample.py

This example shows how to:

• set a callback for AMPL async operation (implementing amplpy.Runnable)
• start and interrupt async operations

Example 4: Get and set data through DataFrames

dataframeexample.py

This example shows how to:

• Use amplpy.DataFrame objects to assign values to sets and parameters
• Use an amplpy.DataFrame object to fetch and decouple values from a variable

Example 5: Operate with multidimensional data

multidimensionalexample.py

This example shows how to:

• Use a amplpy.DataFrame to assign values to multidimensional parameters

Example 6: Assign all data to a model and solve it

dietmodel.py

This example shows how to:

• Assign all the data necessary to generate a model instance programmatically

Example 7: Build an efficient frontier

efficientfrontier.py

This example shows how to:

• build an efficient frontier by repeteatly solve a portfolio problem in AMPL

Example 8: Simple heuristic

trackingmodel.py

This example shows how to:

• Do a simple heuristics for solving a QMIP problem, using the relaxed solution as a hint