Handheld Halting_AOC_2020_Day8

with open('Day8.txt', 'rt') as f:
    data = f.read().split('\n')

instructions = {}
for ind, instruction in enumerate(data):
    command, step = instruction.split()
    instructions[ind] = [command, int(step)]

def procedure (instructions, key, accumulator):
    command, step = instructions.get(key)
    if command == 'nop':
        key += 1
    elif command == 'jmp':
        key += step
    else:
        key += 1
        accumulator += step
    return key, accumulator

#Part 1
key = 0
accumulator = 0
keys = list()
# results = {}

while True:
    key, accumulator = procedure(instructions, key, accumulator)
    if key not in keys:
        keys.append(key)
    else:
        break
print(accumulator)

# Part 2:

def search_change(k, instructions):
    dict_change = {'nop': 'jmp', 'jmp': 'nop'}
    instructions_2 = {}
    key_2 = 0
    keys_2 = list()
    accu = 0
    last_key = max(instructions.keys())
    for old_value, new_value in dict_change.items():
        if instructions.get(k)[0] == old_value:
            dict_update={k:[new_value,instructions.get(k)[1]]}
            instructions_2.update(instructions)
            instructions_2.update(dict_update)
            while last_key not in keys_2:
                key_2, accu = procedure(instructions_2, key_2, accu)
                if key_2 not in keys_2:
                    keys_2.append(key_2)
                else:
                    break
            if keys_2[-1] == last_key:
                key_2, accu = procedure(instructions_2, key_2, accu)
                print('final_accumulator:', accu)
                break

for k in keys:
    search_change(k, instructions)