How do I fix the amplpy error on search path?

Question

I have recently installed Amplpy for python 3.6.5 (win 32 bit), but I am facing the following issue:

• Please make sure that the AMPL folder is in the system search path, or specify the path via:
  AMPL(Environment('full path to the AMPL installation directory'))

---

RuntimeError Traceback (most recent call last)
<ipython-input-4-1768ae85d3ec> in <module>()
 1 from amplpy import AMPL
----> 2 ampl = AMPL()
D:\Poulad\Program\myprog\lib\site-packages\amplpy\ampl.py in __init__(self, environment, langext)
 83 if environment is None:
 84 try:
---> 85 self._impl = amplpython.AMPL()
 86 except RuntimeError as e:
 87 from sys import stderr
RuntimeError: AMPL could not be started: The system cannot find the file specified.

I have also added amplpy and amplpython paths to the search paths through sys.path.append() but the error is poping up again.

Would you please help me to fix the problem?

Answer 1

You have to put the path of the ampl executable when you call ampl (line 2). So instead of:

ampl = AMPL()

you write:

ampl = AMPL(Environment('put/here/your/path/'))

Answer 2

You have to import the Environment class from amplpy. Then you have to specify where your amplpy file is located. It should be something like that:

from amplpy import AMPL,Environment

ampl = AMPL(Environment(r'C:\ampl.mswin64'))

• Lukasavicus: This is the right answer. Notice the path must end in a folder like that "ampl.mswin64"