# list can contain multiple elements, so its name should be plural(+s) bicycles = ["trek", "cannondale", "readline", "specialized"] # start with 0 first_element = bicycles[0] second_element = bicycles[1] # print(f"first_element is {first_element.title()}") # print(f"second_element is {second_element.title()}") # negative number can be used to represent counting from the end last_element = bicycles[-1] second_to_last_element = bicycles[-2] # print(f"last_element is {last_element.title()}") # print(f"second_to_last_element is {second_to_last_element.title()}") motorcycles = ["honda", "yamaha", "suzuki"] # print(f"motorcycles is {motorcycles}") # access element by index motorcycles[0] = "ducati" # print(f"motorcycles is {motorcycles}") # append element as last element motorcycles.append("honda") # print(f"motorcycles is {motorcycles}") # add element to special position motorcycles.insert(1, "bmw") # print(f"motorcycles is {motorcycles}") # del element and don't use anymore del motorcycles[1] # print(f"motorcycles is {motorcycles}") # pop element and save popped element popped_last_motorcycle = motorcycles.pop() # print(f"motorcycles is {motorcycles}") # print(f"popped_last_motorcycle is {popped_last_motorcycle}") popped_index_motorcycle = motorcycles.pop(1) # print(f"motorcycles is {motorcycles}") # print(f"popped_index_motorcycle is {popped_index_motorcycle}") # remove element by value too_expensive = "ducati" motorcycles.remove(too_expensive) # print(f"motorcycles is {motorcycles}") # print(f"I remove {too_expensive} because its too expensive for me") motorcycles = ["ducati", "bmw", "yamaha", "suzuki", "honda"] # Sort the list in ascending order and return None. sort_motorcycles = motorcycles.sort(reverse=True) # print(f"motorcycles is {motorcycles}") # print(f"sort_motorcycles is {sort_motorcycles}") # None # Return a new list containing all items from the iterable in ascending order. sorted_motorcycles = sorted(motorcycles, reverse=True) # print(f"motorcycles is {motorcycles}") # print(f"sorted_motorcycles is {sorted_motorcycles}") # None # reverse original list and return none reverse_motorcycles = motorcycles.reverse() # print(f"motorcycles is {motorcycles}") # print(f"reverse_motorcycles is {reverse_motorcycles}") # None # get list length length = len(motorcycles) # print(f"motorcycles's length is {length}") # [][0] # IndexError: list index out of range # for in magicians = ["alice", "david", "carolina"] # print("\t=== start cycle ===") for magician in magicians: # magician is a dynamic variable # print(f"{magician.title()}, that was a great trick!") # print(f"I cant't wait to see your next trick, {magician.title()}.\n") ... # print("Thank you, everyone. That was a great magic show!\n") # print("\t=== end cycle ===") """ IndentationErrors: 1. IndentationError: expected an indented block after ...; 2. IndentationError: unexpected indent; SyntaxError: 1. SyntaxError: expected:':'; """ japanese_foods = ["うどん", "そば", "お弁当", "お茶", "お粥", "親子丼", "卵"] for japanese_food in japanese_foods: # print(f"I like {japanese_food}") ... # print("I really love japanese food!") # range(stop) -> range object range(start, stop[, step]) -> range object for n in range(3, 5): # print(n) ... # print(type(range(3))) # # print(type(list(range(3)))) # even_numbers = list(range(0, 11, 2)) # print(f"even_numbers is {even_numbers}") # [0, 2, 4, 6, 8, 10] pow_2_even_numbers = [] for number in range(1, 11): pow_2_even_numbers.append(number**2) # [1, 4, 9, 16, 25, 36, 49, 64, 81, 100] # print(f"pow_2_even_numbers is {pow_2_even_numbers}") # min(), max(), sum() max_n = max(pow_2_even_numbers) min_n = min(pow_2_even_numbers) sum_total = sum(pow_2_even_numbers) # print(f"pow_2_even_numbers is {pow_2_even_numbers}") # print(f"the largest element in pow_2_even_numbers is {max_n}") # print(f"the smallest element in pow_2_even_numbers is {min_n}") # print(f"the sum of pow_2_even_numbers is {sum_total}") # list comprehension, create new list in one line code pow_2_even_numbers_ = [number**2 for number in range(1, 11)] # print(f"pow_2_even_numbers_ is {pow_2_even_numbers_}") # slice => list[start:stop:step] player = ["charles", "martina", "michael", "florence", "eli"] # print(player[0:1]) # ['charles'] # print(player[1:3]) # ['martina', 'michael'] # if ignore start index, slice from list[0] # print(player[:3]) # ['charles', 'martina', 'michael'] # print(player[2:-1]) # ['michael', 'florence'] # if ignore end index, slice to list[-1], include list[-1] # print(player[2:]) # ['michael', 'florence', 'eli'] # if ignore start index and end index, a copy of the whole array # print(player[:]) # ['michael', 'florence', 'eli'] # step: 代表每隔多少个元素提取一个 # print(player[0:5:2]) # ['michael', 'florence', 'eli'] # copy list: ignore start and end player_copy = player[:] print(f"player is {player}, length is {len(player)}") print(f"player_copy is {player_copy}, length is {len(player_copy)}")