I have some code I'm analyzing. But I've found that iterating over a dictionary empties it. I've fixed the problem by by making a deepcopy of the dictionary and iterating over that in some code that displays the values, then later use the original dictionary to iterate over that to assign values to a 2D array. Why does iterating over the original dictionary to display it empty it, so that later use of the dictionary is unusable since it is now empty? Any replies welcome.
import copy
# This line fixed the problem
trans = copy.deepcopy(transitions)
print ("nTransistions = ")
# Original line was:
# for state, next_states in transitions.items():
# Which empties the dictionary, so not usable after that
for state, next_states in trans.items():
for i in next_states:
print("nstate = ", state, " next_state = ", i)
# Later code which with original for loop showed empty dictionary
for state, next_states in transitions.items():
for next_state in next_states:
print("n one_step trans state = ", state, " next_state = ", next_state)
one_step[state,next_state] += 1