python - How to fix this? RuntimeError: dictionary changed size during iteration -


when added item dictionary in a function, it's giving error:

inv = { "rope": 1, "torch": 6, "gold coin": 42, "dagger": 1, "arrow": 12 } dragonloot = ['gold coin', 'dagger', 'gold coin', 'gold coin', 'ruby'] def addinventory(invloop, lst):   item in lst:     k,v in invloop.items():       if item == k:         v += 1       else:         invloop[item] = 1   return(invloop) inv = addinventory(inv, dragonloot)

indeed should not add items inventory while looping on it. what's more, don't need inner loop, because advantage of dictionary have direct access via keys: can test whether has key or not in operator.

so instead:

def addinventory(invloop, lst):     item in lst:         if item in invloop:             invloop[item] += 1         else:             invloop[item] = 1     return(invloop)

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