How to use the ipython.__version__ function in ipython

print "python exec:", sys.executable
print "sys.path:", sys.path
try:
    import numpy
    print "numpy: %s, %s" % (numpy.__version__, numpy.__file__)
except ImportError:
    print "no numpy"
try:
    import matplotlib
    print "matplotlib: %s, %s" % (matplotlib.__version__, matplotlib.__file__)
except ImportError:
    print "no matplotlib"
try:
    import ipython
    print "ipython: %s, %s" % (ipython.__version__, ipython.__file__)
except ImportError:
    print "no ipython"
try:
    import sphinx
    print "sphinx: %s, %s" % (sphinx.__version__, sphinx.__file__)
except ImportError:
    print "no sphinx"

print "sys.path:", sys.path

# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
# documentation root, use os.path.abspath to make it absolute, like shown here.
#sys.path.insert(0, os.path.abspath('../GPy'))

#print "sys.path.after:", sys.path