ipynb2py.py

gistfile1.py

import json
import sys

if len(sys.argv)!=2:
    print "Usage: ipynb2py.py FILENAME"
    exit(1)
with open(sys.argv[1]) as data_file:    
    ipynb = json.load(data_file)

code = ""
for c in ipynb["cells"]:
    if c["cell_type"] == "code":
        source = c["source"]
        for s in source:
            if s[0] != "%":
                code += s.rstrip('\n')+"\n"
exec code