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pythoniterationlist-comprehensionternary

python ternary iteration with list comprehension


Is ternary iteration possible? A simplistic version of what I mean, though this particular example could be done in a better way:

c = 0  
list1 = [4, 6, 7, 3, 4, 5, 3, 4]  
c += 1 if 4 == i for i in list1 else 0  

A more practical example:

strList = ['Ulis', 'Tolus', 'Utah', 'Ralf', 'Chair']
counter = 0  
counter += 1 if True == i.startswith('U') for i in strList else 0  
return counter  

Solution

  • Your "practical example" is written as:

    >>> strList = ['Ulis', 'Tolus', 'Utah', 'Ralf', 'Chair']
    >>> sum(1 for el in strList if el.startswith('U'))
    2
    

    Your other example (if I understand correctly) is:

    >>> list1 = [4, 6, 7, 3, 4, 5, 3, 4]
    >>> list1.count(4)
    3
    

    (or just adapt the strList example, but nothing wrong with using builtin methods)