Issue with Python class that has a list

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I have a simple question: Say that I have the following class:

class step:
    alpha = []

and my main has the following:

listofstep = []

for i in range(20):
    z = step()
    z.alpha.append(0)
    listofstep.append[z]

why does len(listofstep[0].alpha) gives me 20?

asked 1 min ago

user103052

26

Issue with Python class that has a list