如何获取此代码以打印我想要的内容？

Question

I need to print

"Topic {topic} was created by {creator} on {date_added}." using a FOR loop. I have entered all the required information into dictionaries as per the assignment.

I don't know what else to try I am new. Looking for help with dictionaries and FOR loops.

    #1.1
    topic1 = {
        "date_added": (2019,9.1),
        "creator": "Mark Scorgie"
    }

    topic2 = {
        "date_added": (2019,9.1),
        "creator": "Mark Scorgie"
    }

    topic3 = {
        "date_added": (2019,9.1),
        "creator": "Mark Scorgie"
    }

    #1.2
    topics = {
        "climbing": topic1,
        "travelling": topic2,
        "swimming": topic3
    }

    #2
    for topic, date_added, creator in sorted(topics.keys()): 
        print(f"Topic {topic} was created on {date_added} by {creator}")

I am getting an error message that {date_added} is not defined. I have tried for topic in sorted(topics.items()) and for topic in sorted(topics.keys()) but no luck. Not sure how to define date_added and creator in each iteration of the loop.

Answer 1

The first problem with your code is you are using a tuple in the "date_added" key.It should be

topic1 = {
    "date_added": "2019,9.1",
    "creator": "Mark Scorgie"
}
for key, value in topics.items():
    print(f"Topic {key} was created on {value['date_added']} by {value['creator']}")

The key will be the name of the topic and the value will be the dictionary contain the info of that topic. You can access the value of a dict by using dict[key_name]

Answer 2

For dict objects, you can do someDict.items() to separate the key value and the element value.

Therefore, you can use for loop to access the key and the value by:

someDict = {
    "abc" : "123"
}

for key, value in someDict.items():
    print(key)                #output: abc
    print(value)              #output: 123