Add sample Python code

hello-buck-python/.buckconfig

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+[python]
+  interpreter = /usr/bin/python2.7
+  path_to_pex_executer = /bin/bash

hello-buck-python/.gitignore

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+# Buck
+/buck-out
+/buck-cache
+/local.properties
+/.buckconfig.local
+/.buckd
+
+# OS X
+.DS_Store
+
+# Python
+/*.pyc

hello-buck-python/BUCK

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+python_binary(
+  name = 'hello_buck_python',
+  main = 'hello_buck.py',
+  deps = [
+    ':calc',
+  ],
+)
+
+python_library(
+	name = 'calc',
+	srcs = glob(['calc.py']),
+)

hello-buck-python/README.md

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+# Hello Buck - Python
+
+A simple demo on how to setup Buck to build and execute Python code
+
+## Running
+
+```
+buck build //:hello_buck_python
+./buck-out/gen/hello_buck_python.pex
+```

hello-buck-python/calc.py

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+from __future__ import division
+from __future__ import print_function
+
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+def add(a, b):
+    """Add two numbers."""
+    return a+b
+
+
+def divide(a, b):
+    """"Divide two numbers. Throw exception if division by zero."""
+    if b == 0:
+        raise ZeroDivisionError()
+    return a/b
+
+
+def subtract(a, b):
+    """Subtract two numbers"""
+    return a-b
+
+
+def multiply(a, b):
+    """Multiply two numbers"""
+    return a*b

hello-buck-python/hello_buck.py

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+from calc import add, multiply
+
+
+def main():
+    print add(1, 2)
+    print multiply(3, 4)
+
+if __name__ == '__main__':
+    main()