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/usr/bin/f2py3 is in python3-numpy 1:1.8.1-1ubuntu1.

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#!/usr/bin/python3
# See http://cens.ioc.ee/projects/f2py2e/
import os, sys
for mode in ["g3-numpy", "2e-numeric", "2e-numarray", "2e-numpy"]:
    try:
        i=sys.argv.index("--"+mode)
        del sys.argv[i]
        break
    except ValueError: pass
os.environ["NO_SCIPY_IMPORT"]="f2py"
if mode=="g3-numpy":
    sys.stderr.write("G3 f2py support is not implemented, yet.\n")
    sys.exit(1)
elif mode=="2e-numeric":
    from f2py2e import main
elif mode=="2e-numarray":
    sys.argv.append("-DNUMARRAY")
    from f2py2e import main
elif mode=="2e-numpy":
    from numpy.f2py import main
else:
    sys.stderr.write("Unknown mode: " + repr(mode) + "\n")
    sys.exit(1)
main()