问题描述
我正在尝试定义一个程序,涉及(课程,人)
,它将输入课程结构和一个人,并返回一个描述所有课程的词典
I am trying to define a procedure, involved(courses, person)
, that takes as input a courses structure and a person and returns a Dictionary that describes all the courses the person is involved in.
这是我的涉及(课程,人)
function:
Here is my involved(courses, person)
function:
def involved(courses, person):
for time1 in courses:
for course in courses[time1]:
for info in time1[course]:
print info
这是我的字典:
courses = {
'feb2012': { 'cs101': {'name': 'Building a Search Engine',
'teacher': 'Dave',
'assistant': 'Peter C.'},
'cs373': {'name': 'Programming a Robotic Car',
'teacher': 'Sebastian',
'assistant': 'Andy'}},
'apr2012': { 'cs101': {'name': 'Building a Search Engine',
'teacher': 'Dave',
'assistant': 'Sarah'},
'cs212': {'name': 'The Design of Computer Programs',
'teacher': 'Peter N.',
'assistant': 'Andy',
'prereq': 'cs101'},
'cs253':
{'name': 'Web Application Engineering - Building a Blog',
'teacher': 'Steve',
'prereq': 'cs101'},
'cs262':
{'name': 'Programming Languages - Building a Web Browser',
'teacher': 'Wes',
'assistant': 'Peter C.',
'prereq': 'cs101'},
'cs373': {'name': 'Programming a Robotic Car',
'teacher': 'Sebastian'},
'cs387': {'name': 'Applied Cryptography',
'teacher': 'Dave'}},
'jan2044': { 'cs001': {'name': 'Building a Quantum Holodeck',
'teacher': 'Dorina'},
'cs003': {'name': 'Programming a Robotic Robotics Teacher',
'teacher': 'Jasper'},
}
}
当我试图测试我的代码时:
When I'm trying to test my code:
>>>print involved(courses, 'Dave')
Python给我一个错误:
Python give me an error:
for info in time1[course]:
TypeError: string indices must be integers, not str
如何解决?
谢谢。
推荐答案
time1
是最外层字典的关键字,例如 feb2012
。那么你试图索引字符串,但你只能用整数来做。我想你想要的是:
time1
is the key of the most outer dictionary, eg, feb2012
. So then you're trying to index the string, but you can only do this with integers. I think what you wanted was:
for info in courses[time1][course]:
当你要经历每个字典,你必须添加另一个嵌套。
As you're going through each dictionary, you must add another nest.
这篇关于TypeError:string indices必须是整数,而不是str //使用dict的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!