Python append to list while iterating | Example code

Use the Python List append() method to append elements to a list while iterating over the list using a for-in loop. If you append a new element to the list while iterating the list results in a list containing the original list’s elements and the new elements.

Python Example Adding an element to list while iterating

Python simple example code.

Get the length of the list obj and iterate over the list. Then call list.append(object) within the loop to add the object to the list while iterating over the list.

a_list = ["a", "b", "c"]

list_length = len(a_list)

for i in range(list_length):
    a_list.append("New " + i.__str__())

print(a_list)

Output:

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Note: IDE: PyCharm 2021.3.3 (Community Edition)

Windows 10

Python 3.10.1

All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.