How to read this code?

[deanhystad]

For some reason the code builds a list of tuples. The expanded code would be:

items = []
for i in book.active.iter_rows():
    for o in i:
        if (
            o.value
            and isinstance(o.value, str)
            and search_string1.lower() in o.value.lower()
            and search_string2.lower() in o.value.lower()
        ):
            items.append((o.value,))

And to answer the other question, (o.value,) makes a tuple that contains o.value.

a = 5
b = (a,)
c = tuple([a])
d = (a)
print(a, b, c, d)

Output:
5 (5,) (5,) 5

Notice that the trailing comma is required. In "b = (a,)" the parenthesis tell Python to make a Tuple. Without the comma, "d = (a)", the parenthesis are interpreted as a grouping operator. Do everything inside the parenthesis first as in x = (1 + 2) * 3 tells Python to add 1 and 2 before multiplying by 3.