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我从下面的某本书中得到了一段python代码，但是运行异常。
# name.py
name = input('What is your first name? ')
print('Hello ' + name.capitalize() + '!')
结果是:
$ python name.py
What is your first name? jack
Traceback (most recent call last):
File "name.py", line 3, in <module>
name = input('What is your first name? ')
File "<string>", line 1, in <module>
NameError: name 'jack' is not defined
它有什么问题？ 谢谢!