3 min read•june 24, 2024
Lists in Python are versatile data structures that allow for easy modification and . They're mutable, meaning you can change their contents after creation, and offer various methods for adding, removing, and accessing elements.
Iterating through lists is a fundamental skill in Python programming. Whether using for loops, list comprehensions, or built-in functions, mastering list iteration techniques enables efficient data manipulation and analysis in your code.
###[append](https://www.fiveableKeyTerm:append)()_0###
adds an element to the end of a list
list_name.append(element)
numbers.append(10)
adds 10
to the end of the numbers
list)[remove()](https://www.fiveableKeyTerm:remove())
removes the first occurrence of a specified element from a list
list_name.remove(element)
fruits.remove("apple")
removes the first occurrence of "apple"
from the fruits
list)ValueError
if the element is not found in the list[pop()](https://www.fiveableKeyTerm:pop())
removes an element at a specified and returns its value
list_name.pop(index)
numbers.pop(2)
removes the element at index 2
from the numbers
list and returns its value)pop()
removes and returns the last element in the listfor
loops iterate through each element in a list
for element in list_name:
for fruit in fruits:
iterates through each element in the fruits
list)0
for the first element and increment by 1
for each subsequent elementlist_name[index]
fruits[0]
accesses the first element in the fruits
list)range()
function with [len()](https://www.fiveableKeyTerm:len())
iterates through list indexes
for i in range(len(list_name)):
for i in range(len(numbers)):
iterates through the indexes of the numbers
list)new_list = [expression for element in list_name if condition]
expression
is the operation performed on each elementelement
is the variable representing each element in the original listlist_name
is the name of the original listif condition
is an optional filter to include elements based on a conditionsquared_numbers = [x ** 2 for x in numbers]
creates a new list with each element from numbers
squared)even_numbers = [x for x in numbers if x % 2 == 0]
creates a new list with only even numbers from numbers
)in
operator can be used to check for the presence of an element in a list during iterationfor
loops, list comprehensions, and built-in functions like map()
and filter()