When you open a file with the name "filename.ext"; you are telling the open() function that your file is in the current working directory . This is called a relative path.
file = open('filename.ext') //relative path
In the above code, you are not giving the full path to a file to the open() function, just its name - a relative path. The error "
FileNotFoundError: [Errno 2] No such file or directory" is telling you that there is no file of that name in the working directory. So, try using the exact, or absolute path.
file = open(r'C:\path\to\your\filename.ext') //absolute path
In the above code, all of the information needed to locate the file is contained in the path string - absolute path.
If the user does not pass the full path to the file (on Unix type systems this means a path that starts with a slash), the python file path is interpreted relatively to the current working directory. The current working directory usually is the directory in which you started the program. In order to make this work, the directory containing the python executable must be in the PATH, a so-called environment variable that contains directories that are automatically used for searching executables when you enter a command. In any case, if your Python script file and your data input file are not in the same directory, you always have to specify either a relative path between them or you have to use an absolute path for one of them.
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john malib
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Original Message:
Sent: Mon March 29, 2021 06:42 PM
From: Carlos Cesar Martins Ferreira
Subject: Error using CPLEX and Python
I tried to run CPLEX with IDLE (Python 3.9 64-bit) but I received the following message:
Traceback (most recent call last):
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\environment.py", line 290, in get_cplex_module
import cplex #@UnresolvedImport
ModuleNotFoundError: No module named 'cplex'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\Acer\OneDrive\#####PRODEGI\4º Sem\Optimization\FinalAssignement\Scenario2.py", line 67, in <module>
mdl=Model('CVRP')
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\model.py", line 417, in __init__
self._environment = self._make_environment()
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\model.py", line 181, in _make_environment
env = Environment.get_default_env()
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\environment.py", line 427, in get_default_env
Environment._default_env = Environment.make_new_configured_env()
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\environment.py", line 422, in make_new_configured_env
return Environment(start_auto_configure=True)
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\environment.py", line 84, in __init__
self.auto_configure(logger=logger)
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\environment.py", line 220, in auto_configure
self.check_cplex(logger=logger)
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\environment.py", line 328, in check_cplex
cplex = self.get_cplex_module(logger=logger)
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\environment.py", line 314, in get_cplex_module
cplex = load_cplex_from_cos_root(loc) if loc else None
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\environment.py", line 286, in load_cplex_from_cos_root
return load_cplex(full_path, version=version)
File "C:\Users\Acer\AppData\Local\Programs\Python\Python39\lib\site-packages\docplex\mp\environment.py", line 261, in load_cplex
raise FileNotFoundError("Could not load module from %s" % module_location)
FileNotFoundError: Could not load module from C:\Program Files\IBM\ILOG\CPLEX_Studio_Community201\cplex\python\3.9\x64_win64\cplex\__init__.py
Can you help me?
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Carlos Cesar Martins Ferreira
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#DecisionOptimization