I encountered an import error from collections import OrderedDict, while using pybedtools under Python 2.6. It took me some time to find a workaround… I posted it below.

# install dependencies and pybedtools
pip install cython ordereddict
pip install pybedtools

# edit file ... lib/python2.6/site-packages/pybedtools/contrib/venn_maker.py
# comment import from collections and add try-except
#from collections import OrderedDict
try:                                 
    from collections import OrderedDict
except ImportError:
    from ordereddict import OrderedDict