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class SourcePortAdapter(HTTPAdapter):

 """"Transport adapter" that allows us to set the source port."""

 def __init__(self, port, *args, **kwargs):

  self.poolmanager = None

  self._source_port = port

  super().__init__(*args, **kwargs)

 def init_poolmanager(self, connections, maxsize, block=DEFAULT_POOLBLOCK, **pool_kwargs):

  self.poolmanager = PoolManager(

   num_pools=connections, maxsize=maxsize,

   block=block, source_address=('', self._source_port))

s = requests.Session()

s.mount('https://baidu.com', SourcePortAdapter(54321))

s.get('https://baidu.com')

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c = pycurl.Curl()

c.setopt(c.URL, 'https://curl.haxx.se/dev/')

c.setopt(c.LOCALPORT, 54321)

c.setopt(c.LOCALPORTRANGE, [52314,56321,5532])

c.perform()

c.close()

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curl --local-port 12520 http://baidu.com