human
Give me a the Python code you requested given the following:
I am working on the file "Alumnos/AleisterMontfort/Tarea1AleisterM+19_06_17.ipynb".
The first task is:
Ejercicio 4
Definir matriz de ceros
Can you write Python code for it?
assistant
#Here is the Python code you requested.

def zeros(m, n):
    return [[0]*n for _ in range(m)]
    def __str__(self):
        for l in self.data:
            x= "\n".join([str(s) for s in self.data])
            for s in x:
                return x.replace(',','')

zeros(4,6)