# Does Scipy conflict with PSS/E ?

Hi all,

Thank you for coming to watch the question. I am trying to optimize the output from PSS/E then send the results back to PSS/E for further operations.

I found PSS/E doesn't work with Scipy package (a very popular optimization package in python), does anyone encounter the same problem before?

The code below is a concise example that shows the problem, in my IDE (Spyder), as long as you initialize PSS/E, the program is going to be stuck and die.

You are welcome to try the code：

```
import os, sys
# Set environment for psse33.04
PYTHONPATH = r'C:\Program Files (x86)\PTI\PSSE33\PSSBIN'
sys.path.append(PYTHONPATH)
os.environ['PATH'] += ';' + PYTHONPATH
import psspy
_i = psspy.getdefaultint()
_f = psspy.getdefaultreal()
import redirect
redirect.psse2py()
psspy.psseinit(buses=50) # the optimization code doexn't work as long as you keep this line!!!
from scipy.optimize import minimize
import numpy as np
fun = lambda x : (x[0] - 0.667) / (x[0] + x[1] + x[2] - 2) # obj: min (x−2/3)/(x+y+z−2)
cons = ({'type': 'eq', 'fun': lambda x: x[0] * x[1] * x[2] - 1}, # xyz=1
{'type': 'ineq', 'fun': lambda x: x[0] }, #x>0
{'type': 'ineq', 'fun': lambda x: x[1] },#y>0
{'type': 'ineq', 'fun': lambda x: x[2] }#z>0
)
x0 = np.array((1.0, 1.0, 1.0)) #
res = minimize(fun, x0, method='SLSQP', constraints=cons)
print('min value:',res.fun)
print('solution:',res.x)
print('success or not:', res.success)
print('message:', res.message)
```

Thanks in advance, any help will be appreciated.

I have not used PSS/E from within Spyder, but I have never had any issue running PSS/E from within IDLE. If you try running the code from within IDLE, and it runs successfully, then you know that it's an issue with the Spyder IDE.

Thank you very much, the problem was solved.