14. 练习：字符串

练习：修正引言

以下练习中的代码将因为错误地使用引号而导致 SyntaxError。首先请点击“测试答案”查看错误消息。然后解决该问题，将（ Henry Ford ）的引言正确地赋值给变量 ford_quote 。

Start Quiz:

# TODO: Fix this string!
ford_quote = 'Whether you think you can, or you think you can't--you're right.'

练习：编写服务器日志消息

在此编程练习中，你将运用所学的字符串知识编写服务器日志消息。

你将获得用户示例数据、他们的访问时间和访问的网站。你应该使用提供的变量和所学的技能输出如下所示的日志消息（将用户名、网址和时间戳替换为相应变量的值）：

Yogesh accessed the site http://petshop.com/pets/reptiles/pythons at 16:20.

当你在编写这段代码时，可以点击 测试答案 按钮，看看结果如何。

Start Quiz:

username = "Kinari"
timestamp = "04:50"
url = "http://petshop.com/pets/mammals/cats"

# TODO: print a log message using the variables above.
# The message should have the same format as this one:
# "Yogesh accessed the site http://petshop.com/pets/reptiles/pythons at 16:20."

练习： len

使用字符串连接和 len 函数计算某些电影明星的实际完整姓名的长度。将该长度存储在变量 name_length 中。注意，姓名不同部分之间有空格！

Start Quiz:

given_name = "William"
middle_names = "Bradley"
family_name = "Pitt"

name_length = #todo: calculate how long this name is

# Now we check to make sure that the name fits within the driving license character limit
# Nothing you need to do here
driving_license_character_limit = 28
print(name_length <= driving_license_character_limit)