Check if class property value exists in list of objects

Question

I have a class with 2 properties:

class ButtonPress():
    def __init__(self, time, button):
        self.time = time
        self.button = button

I create a list with ButtonPress objects inside them:

buttonlist = []
buttonlist.append(ButtonPress("25", "a")
buttonlist.append(ButtonPress("5", "b"))

How can I check if within the list any of the objects has a specific time value? I'm trying:

if "25" in buttonlist[:]['time']
    print("yaaay")
else:
    print("feck")

But this does not work.

Start with a simpler question: how would you check if some *single* `ButtonPress` object `b` has a time of `"25"`? — chepner, Oct 07 '19 at 13:04
Do you have many ButtonPress events? Can such an event happen twice in one time? — balderman, Oct 07 '19 at 13:18

score 6 · Accepted Answer · answered Oct 07 '19 at 12:59

Use any:

class ButtonPress():
    def __init__(self, time, button):
        self.time = time
        self.button = button

buttonlist = []
buttonlist.append(ButtonPress("25", "a"))
buttonlist.append(ButtonPress("5", "b"))

if any(button.time == "25" for button in buttonlist):
    print("yaaay")
else:
    print("feck")

Output

yaaay

An alternative using in is the following:

if "25" in (button.time for button in buttonlist):

Check if class property value exists in list of objects

1 Answers1