这是我要求用户输入城市数量的代码，应仅允许该城市数量输入要求是使用For Loop
global number_of_cities
global city
global li
global container
li = []
number_of_cities = int(raw_input("Enter Number of Cities -->"))
for city in range(number_of_cities):
city = (raw_input("Enter City Name -->"))
li = city
print li[]
假设您想要一个城市列表，li可以执行以下操作：
li = []
number_of_cities = int(raw_input("Enter Number of Cities -->"))
for city in range(number_of_cities):
li.append(raw_input("Enter City Name -->"))
print(li)
不需要global在变量前面，也不需要在开始时定义其他变量，只需要空白列表。
实际上，这是一个学习列表理解的好例子，例如
n = int(raw_input("Enter Number of Cities: "))
li = [raw_input('City Name: ') for city in range(n)]
print(li)
这给出了：
>>> n = int(raw_input("Enter Number of Cities: "))
Enter Number of Cities: 4
>>> li = [raw_input('City Name: ') for city in range(n)]
City Name: London
City Name: Paris
City Name: Dubai
City Name: Sidney
>>> print(li)
['London', 'Paris', 'Dubai', 'Sidney']
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我来说两句