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----
-date: 2020-05-07
-title: "A Python API for Ouroboros"
-linkTitle: "Python"
-description: "Python"
-author: Dimitri Staessens
----
-
-Support for other programming languages than C/C++ has been on my todo
-list for quite some time. The initial approach was using
-[SWIG](http://www.swig.org), but we found the conversion always
-clunky, it didn't completely work as we wanted to, and a while back we
-just decided to deprecate it. Apart from C/C++ we only had a [rust
-wrapper](https://github.com/chritchens/ouroboros-rs).
-
-Until now! I finally took the time to sink my teeth into the bindings
-for Python. I had some brief looks at the
-[ctypes](https://docs.python.org/3/library/ctypes.html) library a
-while back, but this time I looked into
-[cffi](https://cffi.readthedocs.io/en/latest/) and I was amazed at how
-simple it was to wrap the more difficult functions that manipulate
-blocks of memory (flow\_read, but definitely the async fevent() call).
-And now there is path towards a 'nice' Python API.
-
-Here is a taste of what the
-[oecho](https://ouroboros.rocks/cgit/ouroboros/tree/src/tools/oecho/oecho.c)
-tool looks like in Python:
-
-```Python
-from ouroboros import *
-import argparse
-
-
-def client():
-    f = flow_alloc("oecho")
-    f.writeline("Hello, PyOuroboros!")
-    print(f.readline())
-    f.dealloc()
-
-
-def server():
-    print("Starting the server.")
-    while True:
-        f = flow_accept()
-        print("New flow.")
-        line = f.readline()
-        print("Message from client is " + line)
-        f.writeline(line)
-        f.dealloc()
-
-
-if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description='A simple echo client/server')
-    parser.add_argument('-l', '--listen', help='run as a server', action='store_true')
-    args = parser.parse_args()
-    if args.listen is True:
-        server()
-    else:
-        client()
-```
-
-I have more time in the next couple of days, so I expect this to be
-released after the weekend.
-
-Oh, and here is a picture of Ouroboros load-balancing between the C (top right)
-and Python (top left) implementations using the C and Python clients:
-
-{{<figure width="60%" src="/blog/news/20200507-python-lb.png">}}
-
-Can't wait to get the full API done!
-
-Cheers,
-
-Dimitri