Python Lists
#numbers, booleans, string, list of lists
#matrix is a 2d list
#part 1 make your first list
#list with numbers
#list with strings
list_nums = [1,2,3,4,5] list_letters = ['a', 'b', 'c', 'd'] list_num_letters = ['a', 3, '5', 6] list_with_a_list = [[1,4], [3,3], [7,8]] #part 2 grab elements
#how to print everything print(list_with_a_list) 
#grab the first element from list_nums list_nums[0] 
#grab the 3rd letter from list_letters list_letters[3] 
#negative index list_letters[-1] 
grab multiple elements from listhttps://go.elementor.com/widget-image
list_letters[0:2] 
#every 2nd letter
list_letters[::2] 
#unpacking
#unpacking one, two, three, four = list_letters one, two, *other = list_letters #part 4 replace elements
list_nums[0] = 8 # list_letters[4] = 'y' # This line caused the error list_letters[3] = 'y' # Accessing a valid index (the last element) list_with_a_list[2] = [5,5] #Part 5 Methods
#number of elements len(list_letters) 
#ascending
list_letters.sort() print(list_letters) 
sorted(list_letters) 
#reversed by initial order list_num_letters.reverse() print(list_num_letters) 
#reverse alphabetical orders list_nums.sort(reverse=True) print(list_nums) 
#return index
#return index of sometyhing list_num_letters.index('a') 
#add to python list
list_letters.append('z') print(list_letters) 
#add another list using extend metiod
list_letters.extend(['l', 'r']) print(list_letters) 
list_letters_add = ['a', 'b', 'c'] list_letters.extend(list_letters_add) print(list_letters) 
#3rd way to add to list
list_letters = list_letters + ['k', 'z', 'y'] print(list_letters) 
#method to add to beginning of list
list_letters.insert(0, 't') print(list_letters) 
list_letters.insert(3, 'q') print(list_letters) 
#remove from python list
#remove original list_letters.remove('t') #can only remove 1 item print(list_letters) 
#pop list_letters.pop(0) #removes 0 by default 
print(list_letters) 
popped_letter = list_letters.pop(2) print(popped_letter) 
print(list_letters) 
#removes the items in the list -> turns the list empty print(list_num_letters) 
list_num_letters.clear() print(list_num_letters) 
#LOOPS
for letter in list_letters: print(letter) 
#enumerate gives index and value for index, letter in enumerate(list_letters): print(index, letter) 
for index, letter in enumerate(list_letters, start=2): print(index, letter) #move index 
#memory views list_letters2 = list_letters #list_nums2 will change with any list_nums, this isn't a copy #list_nums2[0] changes list_nums[0] list_letters2[0] = 'A' print(list_letters) 
print(list_letters2) 
#copy Beginning to end, new list list_letters3=list_letters[:] list_letters4=list_letters[0:2] #slice option list_letters5 = list_letters.copy() list_letters5 
list_letters5[0] = "I" print(list_letters) 
print(list_letters5) 
#Swapping Elements
temp = list_letters5[1] list_letters5[1] = list_letters5[3] list_letters5[3] = temp print(list_letters5) 
#MISC
#print comma seperated list_str = ' | '.join(list_letters) print(list_str) 
list_letters_from_str = list_str.split(' | ') print(list_letters_from_str) 
#print element multiple times
print(list_letters_from_str[0]*5) 
