Confused Codes

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inner_net = False
p_ip = '1.1.1.1'
t_ip = '2.2.2.2'


def switch_ip(a, b, c):
    if a:
        b = c
        return b
    return b


def read_apps():
    # global p_ip
    p_ip = switch_ip(inner_net, p_ip, t_ip)
    print(p_ip)


if __name__ == '__main__':
    read_apps()