06.Forum Topics - Nested Dictionaries Exercises
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You have been tasked to store a few forum topics, and filter them by several given tags.
You will be given several input lines, containing data about topics in the following format:
{topic} -> {tag1, tag2, tag3...}
The topic and tags will be strings. They will NOT contain spaces or ‘-’, ‘>’ symbols.
If you receive an existing topic, you must add the new tags to it. There should be NO duplicate tags.
When you receive the command “filter”, you must end the input sequence. On the next line (after “filter”), you will receive a sequence of tags, separated by a comma and a space. You must print ONLY those topics, which contain all tags in the given sequence.
The topics must be printed in the following format:
{topic} | {#tag1, #tag2, …, #tagN}
NOTE: The tags have a number sign (‘#’) as a prefix.
| Input | Output |
| HelloWorld -> hello, forum, topic HelpWithHomework -> homework, forum, topic filter forum, topic |
HelloWorld | #hello, #forum, #topic HelpWithHomework | #homework, #forum, #topic |
| First -> this First -> that First -> who Second -> this, what, why First -> this Third -> this, third Third -> that filter that, this |
First | #this, #that, #who Third | #this, #third, #that |