Why does this goes on an infinite loop? newbie here

Question

I am new here so I hope I can get some help. So can anyone explain to me how does this become an infinite loop?

def main():  
    myList = ["abc", "de", "f"]  
    for element in myList:  
        print(element)  
        myList.append(element)  
        print("End")   
        print(myList)  
main()  

Answer 1

Because you're mutating myList , the list you're iterating over, while you iterate over it, by keeping appending element to it, so it keeps growing at the same pace you're consuming it, so to speak.

You should iterate over a copy of myList instead:

Change:

for element in myList:

to:

for element in myList[:]: