Python-if 语句下的多个条件

Question

I am trying to write a function that will classify goods in a given dataset (in a very straightforward way, i know).

It looks like:

def classifier(x):
    if ('smth' or 'smth' or 'smth') in x:
        return 'class1'
    elif ('smth' or 'smth' or 'smth') in x:
        return 'class2'

So, the problem is that some conditions do not work. When I try to check conditions separately - everything works. But in the function something goes wrong.

I use thing function with a pandas apply -method:

data['classes'] = data['subj'].apply(lambda x: classifier(x))

Answer 1

('smth' or 'smth' or 'smth') performs a consecutive logical comparison left-to-right, but not check for occurrence each of them within a target sequence.

To check if any value from a predefined list (iterable) occurs within a target sequence x use builtin any function:

def classifier(x):
    if any(i in x for i in ('a', 'b', 'c')):
        return 'class1'
    elif any(i in x for i in ('d', 'e', 'f')):
        return 'class2'

Answer 2

You could use this:

def classifier(x):
    if 'smth' in x or 'smth' in x or 'smth' in x:
        return 'class1'
    elif 'smth' in x or 'smth' in x or 'smth' in x:
        return 'class2'

You have to check for each condition separately.