This is not done with nested classes but with composition:
class Tool:
def __init__(self, target):
self.target = target
self.wifi = Wifi(self.target)
class Wifi:
def __init__(self, target):
self.target = target
def connect(self, id):
print id
self.target.write("xxxxxxxxx")
def verify(self)
pass
if __name__ == '__main__':
T = Tool(target)
T.wifi.connect("dev")
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solved Python : How to write class in class