Check if element exists in tuple of tuples

Question

I have a list of tuples that look like :

CODES = (
    (\'apple\', \'reddelicious\'),
    (\'caramel\', \'sweetsticky\'),
    (\'banana\', \'yellowfruit\'),
         


        

Answer 1

You can use itertools.chain():

Using it with in will result in short-circuiting, similar to any().

In [30]: CODES = (
   ....:     ('apple', 'reddelicious'),
   ....:     ('caramel', 'sweetsticky'),
   ....:     ('banana', 'yellowfruit'),
   ....: )


In [31]: from itertools import chain

In [32]: 'apple' in chain(*CODES)
Out[32]: True

In [33]: 'foo' in chain(*CODES)
Out[33]: False

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For performance comparisons you can check my other answer.