How can I exchange two elements in a python list?

Question

I didn't really find any solution because "swap", "change" and "exchange" are really overloaded words. I am still in the beginning phase of learning and trying to exchange the words "empty" and instead let it insert the parameter behind "add_city".

cities = ["Tokio", "empty", "Berlin", "Accra", "empty"]

def add_city(article):
    for article in cities:
        if article == "empty":
            article = cities[1]
            cities.append(article)
            break
print(cities)



add_city("Paris")

So in the end it should print out:

["Tokio", "Paris", "Berlin", "Accra", "empty"]

Can anyone give a quick guidance?

Answer 1

You can use index to do that:

cities = ["Tokio", "empty", "Berlin", "Accra", "empty"]

def add_city(city, cities):
    cities[cities.index('empty')] = city
    print(cities)

add_city("Paris", cities)

Index will return the index of the first appear of 'empty', and you simply fill that index with the city you pass.