Typeerror: importPoisson() takes 1 positional argument but 2 Were Given

Question

I am trying to import from an external file some data to be able to generate a graph and such, but every time of this error, follows my code:

They may also say bugs you found in my code that can be improved, I’m starting in python yet and would like to learn too

import matplotlib.pyplot as plt

class poisson():

    def __init__(self):
        stopTimes = []
        times = []
        self.stopTime = stopTimes
        self.times = times

    def importPoisson(enterArchive):
        database = open('import/'+enterArchive+'.csv', 'r')

        for count in database:
            count = count.strip()
            stop,time = count.split(',')
            poisson.stopTimes.append(stop)
            poisson.times.append(time)

        return poisson.stopTimes, poisson.times

    def plotGraphic(self):
        plt.title("Poisson")
        plt.step(poisson.times, poisson.stopTimes, label="Paradas de carros")
        plt.legend()
        plt.xlabel("Tempo")
        plt.ylabel("Paradas")
        plt.show()

pos = poisson()

pos.importPoisson("eventEntrance")
pos.plotGraphic()

Follow a print of the data I want to enter