Check if a list exists python

- Check if a list index exists python
- Check if a list exists in another list python
- Check if list item exists python
- Check if list key exists python
- Check if string exists in a list python
- Check if a number exists in list python
- Check if a variable exists in a list python
- Check if a word exists in a list python
- Check if an element in a list exists in another list python
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