[Python] Running the same function multiple times concurrently

So what I want to do is run the same function multiple times simultaneously while getting a result as return and storing it in an array or list. It goes like this:

def base_func(matrix,arg1,arg2):
result = []
for row in range(matrix.shape[0]):
#perform necessary operation on row and return a certain value to store it into result
x = func(matrix[row],arg1,arg2)
result.append(x)
return np.array(result)


I tried using threading in python. My implementation goes:

def base_func(matrix,arg1,arg2):
result = []
threads = []
for row in range(matrix.shape[0]):
t = threading.Thread(target=func,args=(matrix[row],arg1,arg2,))
threads.append(t)
t.start()
for t in threads:
res = t.join()
result.append(res)
return np.array(result)


This doesn't seem to work and just returns None from the threads.

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