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How to check if all elements of a list matches a condition? - http://stackoverflow.com/questions/10666163/how-to-check-if-all-elements-of-a-list-matches-a-condition
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| # every item | |
| all(item.prop == '' for item in items) | |
| # at least one item | |
| any(item.prop == '' for item in items) | |
| # any item of a is in b | |
| any(any(x==y for y in b) for x in a) |
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