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列表
Lists 与 arrays 非常相似。它们可以包含任何类型的变量，并且可以包含任意数量的变量。Lists 也可以非常简单地进行迭代。这里是一个如何构建 List 的示例。
mylist = []
mylist.append(1)
mylist.append(2)
mylist.append(3)
print(mylist[0]) # prints 1
print(mylist[1]) # prints 2
print(mylist[2]) # prints 3
# prints out 1,2,3
for x in mylist:
print(x)
访问一个不存在的索引会生成一个异常（错误）。
mylist = [1,2,3]
print(mylist[10])
Exercise
在这次练习中，你需要使用 "append" list 方法将数字和字符串添加到正确的 lists 中。你必须将数字 1、2 和 3 添加到 "numbers" list 中，并将 'hello' 和 'world' 两个单词添加到 strings 变量中。
你还需要使用括号操作符 [] 填写 names list 中的第二个名字到变量 second_name。注意索引是从零开始的，所以如果你想访问 list 中的第二项，它的索引就是 1。
numbers = []
strings = []
names = ["John", "Eric", "Jessica"]
# write your code here
second_name = None
# this code should write out the filled arrays and the second name in the names list (Eric).
print(numbers)
print(strings)
print("The second name on the names list is %s" % second_name)
numbers = []
strings = []
names = ["John", "Eric", "Jessica"]
# write your code here
numbers.append(1)
numbers.append(2)
numbers.append(3)
strings.append("hello")
strings.append("world")
second_name = names[1]
# this code should write out the filled arrays and the second name in the names list (Eric).
print(numbers)
print(strings)
print("The second name on the names list is %s" % second_name)
test_output_contains("[1,2,3]", no_output_msg= "Make sure that you have printed the `numbers` list.")
test_output_contains("['hello', 'world']", no_output_msg= "Make sure that you have printed the `strings` list.")
test_output_contains("The second name on the names list is Eric", no_output_msg= "Did you fill in the variable `second_name` with the second name in the names list?")
success_msg("Great Job!")
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