What is a list

Represents array in Python.

array = [1,2,3]

Adding Item

.append()

thislist = ["apple", "banana", "cherry"]

thislist.append("orange")

print(thislist) # ['apple', 'banana', 'cherry', 'orange']

.insert()

thislist = ["apple", "banana", "cherry"]
thislist.insert(1, "orange")
print(thislist) # ['apple', 'orange', 'banana', 'cherry']

.extend()

thislist = ["apple", "banana", "cherry"]
tropical = ["mango", "pineapple", "papaya"]
thislist.extend(tropical)
print(thislist) # ['apple', 'banana', 'cherry', 'mango', 'pineapple', 'papaya']

The extend() method does not have to append lists, you can add any iterable object (tuples, sets, dictionaries etc.).

thislist = ["apple", "banana", "cherry"]
thistuple = ("kiwi", "orange")
thislist.extend(thistuple)
print(thislist) # ['apple', 'banana', 'cherry', 'kiwi', 'orange']

Removing Item

.remove()

thislist = ["apple", "banana", "cherry"]
thislist.remove("banana")
print(thislist) # ['apple', 'cherry']

.pop()

thislist = ["apple", "banana", "cherry"]
thislist.pop(1) # removes at index 1
print(thislist) # ['apple', 'cherry']

.clear()

thislist = ["apple", "banana", "cherry"]
thislist.clear()
print(thislist) # []

.del

thislist = ["apple", "banana", "cherry"]
del thislist[0]
print(thislist) # ['banana', 'cherry']

len()

len() function returns the number of items in a list.

mylist = ["apple", "banana", "cherry"]

arr_length = len(mylist)

Returns number of characters in a string.

mylist = "Hello"
x = len(mylist)