As a backend developer, you will need to test your API before shipping. We provide a simple way to patch the url before client actually making a request. (note: this sample requires requests installed on your environment.)
from pyswagger import App
from pyswagger.contrib.client.request import Client
# create a App with a local resource file
app = App.create('/path/to/your/resource/file/swagger.json')
# init the client
client = Client()
# try to making a request
client.request(
app.op['getUserByName'](username='Tom'),
opt=dict(
url_netloc='localhost:8001' # patch the url of petstore to localhost:8001
))