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Write a function called gen_key that creates a license key with this format: KI80OMZ7-5OGYC1AC-735LDPT1-4L11XU1U. The key consists of a combination of upper case letters and digits.

It takes two arguments: parts and chars_per_part which default to 4 and 8 respectively, so you can call the function like:

  • gen_key() to get a similar key as above, or
  • as gen_key(parts=3, chars_per_part=4) to get a shorter one, e.g.: 54N8-I70K-2JZ7.

Before you default to random, check if Python >= 3.6 has a better option available for this task ...

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