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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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well done my friend :D keep going!
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Because when you convert a normal (denary) number into another base (binary), it turns it into a string but includes the what base it is as a prefix. "0b" - binary, "0o" - octal, "0x" - hexadecimal.
When you use bin(), it adds this prefix on to the number (so it becomes "0b10"). Simply filter out the first two characters in the string you are returning.