[Python] NameError: global name 'symbols' is not defined

[chetanborse007]

hfst-optimized-lookup-python package fails with below error, when it does not find symbol number:

Traceback (most recent call last):
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/hfst_lookup-1.0-py2.7.egg/hfst_lookup//hfst_lookup.py", line 57, in
if word.isalpha() and transducer.analyze(word):
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/hfst_lookup-1.0-py2.7.egg/hfst_lookup/transducer.py", line 162, in analyze
self.inputString.s.append(self.letterTrie.findKey(inputline))
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/hfst_lookup-1.0-py2.7.egg/hfst_lookup/shared.py", line 120, in findKey
return self.root.find(indexstring)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/hfst_lookup-1.0-py2.7.egg/hfst_lookup/shared.py", line 107, in find
if not (current in symbols):
NameError: global name 'symbols' is not defined

This issue has a simple fix.
Replace 'symbols' with 'self.symbols'