Python 3 len() built-in function TUTORIAL

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Tutorial on how to use the len() built-in function from the Python 3 Standard Library.

Discussion of how to avoid TypeErrors.

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Python len built-in function
Python len built-in
Python len function
Python len
Python len example

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I have a question
I have repeated countries in a list they want me to do number of countries minus the number unique countries. They want me to use Len function on both unique_countries and countries to calculate and assign the result to the variable num_of_repeats.
Tried to fallow similar to what you showed but I keep getting error
Please help 🥺

Mj

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