Python : What is the purpose of a double comma in a if statement : I have this piece of python code below.

    def m(list):
        v = list[0]
        for e in list:
          if v < e: v = e
        return v
     
    values = [[3, 4, 5, 1], [33, 6, 1, 2]]
     
    for row in values: 
        print(m(row), end = " ")

The result is 5, 33.

Can somebody explain me that following if statement `if v < e: v = e`?