随笔

>>> players = ['charles', 'martina', 'michael', 'florence', 'eli']
>>> print(players[0:3])
['charles', 'martina', 'michael']
>>> print([2:4])
SyntaxError: invalid syntax
>>> print([2:4])
SyntaxError: invalid syntax
>>> print(players[2:4])
['michael', 'florence']
>>> print(players[:4])
['charles', 'martina', 'michael', 'florence']
>>> print(players[2:])
['michael', 'florence', 'eli']
>>> print(players[-3:])
['michael', 'florence', 'eli']
>>> for player in players[:3]:
    print(player)

    
charles
martina
michael
>>> sorted(player)
['a', 'c', 'e', 'h', 'i', 'l', 'm']
>>> player
'michael'
>>> 'michael'
'michael'
>>> 
>>> my_foods = ['pizza', 'falafel', 'carrot cake', 'fruit', 'drink']
>>> friend_food = my_food[:]
Traceback (most recent call last):
  File "<pyshell#107>", line 1, in <module>
    friend_food = my_food[:]
NameError: name 'my_food' is not defined
>>> friend_food = my_foods[:]
>>> print("My favorite food are ")
My favorite food are 
>>> print(my_foods)
['pizza', 'falafel', 'carrot cake', 'fruit', 'drink']
>>> my_foods.append(cannoli)
Traceback (most recent call last):
  File "<pyshell#111>", line 1, in <module>
    my_foods.append(cannoli)
NameError: name 'cannoli' is not defined
>>> my_foods.append('cannoli')
>>> friends_food.append("ice cream")
Traceback (most recent call last):
  File "<pyshell#113>", line 1, in <module>
    friends_food.append("ice cream")
NameError: name 'friends_food' is not defined
>>> friends_food.append('ice cream')
Traceback (most recent call last):
  File "<pyshell#114>", line 1, in <module>
    friends_food.append('ice cream')
NameError: name 'friends_food' is not defined
>>> friend_food.append("ice cream")
>>> print(my_foods)
['pizza', 'falafel', 'carrot cake', 'fruit', 'drink', 'cannoli']
>>> print(friend_food)
['pizza', 'falafel', 'carrot cake', 'fruit', 'drink', 'ice cream']
>>> a = ['b', 'c', 'd', 'e',]
>>> aa = a[:]
>>> print(aa[0:2])
['b', 'c']
>>> print(aa[0:3])
['b', 'c', 'd']
>>> print(aa[3:-3])
[]
>>> aa = a
>>> print(aa[3:-3])
[]
>>> a
['b', 'c', 'd', 'e']
>>> a.append("f")
>>> a
['b', 'c', 'd', 'e', 'f']
>>> print(aa[3:-3])
[]
>>> print(a[3:-3])
[]
>>> print(aa[2:4])
['d', 'e']
>>> print(aa[1:4])
['c', 'd', 'e']
>>> print(aa[-3:])
['d', 'e', 'f']
>>> friend_pizzas = ['pizza', 'falafel', 'carrot cake', 'fruit']
>>> friend_pizzas.append('ice cream')
>>> friend_pizzas.remove('ice cream')
>>> 
>>> friend_pizzas
['pizza', 'falafel', 'carrot cake', 'fruit']
>>> my_foods = friend_pizzas[:]
>>> friend_pizzas.append('ice cream')
>>> friend_pizzas
['pizza', 'falafel', 'carrot cake', 'fruit', 'ice cream']
>>> my_foods
['pizza', 'falafel', 'carrot cake', 'fruit']
>>> a = []
>>> for a in my_foods:
    print(a)

    
pizza
falafel
carrot cake
fruit
>>> for b in my_foods:
    a.append(b)
    print(b)

    
Traceback (most recent call last):
  File "<pyshell#148>", line 2, in <module>
    a.append(b)
AttributeError: 'str' object has no attribute 'append'
>>> for b in my_foods:
    a.append(b)
    print(a)

    
Traceback (most recent call last):
  File "<pyshell#150>", line 2, in <module>
    a.append(b)
AttributeError: 'str' object has no attribute 'append'
>>> a
'fruit'
>>> a=[]
>>> a
[]
>>> for b in my_foods:
    a.append(b)
    print(a)

    
['pizza']
['pizza', 'falafel']
['pizza', 'falafel', 'carrot cake']
['pizza', 'falafel', 'carrot cake', 'fruit']
>>> for b in my_foods:
    a.append(b)
    print(a)

    
['pizza', 'falafel', 'carrot cake', 'fruit', 'pizza']
['pizza', 'falafel', 'carrot cake', 'fruit', 'pizza', 'falafel']
['pizza', 'falafel', 'carrot cake', 'fruit', 'pizza', 'falafel', 'carrot cake']
['pizza', 'falafel', 'carrot cake', 'fruit', 'pizza', 'falafel', 'carrot cake', 'fruit']
>>> for b in my_foods:
    a.append(b)

    
>>> print(a)
['pizza', 'falafel', 'carrot cake', 'fruit', 'pizza', 'falafel', 'carrot cake', 'fruit', 'pizza', 'falafel', 'carrot cake', 'fruit']
>>> a
['pizza', 'falafel', 'carrot cake', 'fruit', 'pizza', 'falafel', 'carrot cake', 'fruit', 'pizza', 'falafel', 'carrot cake', 'fruit']
>>>