algorithem for detect documents similar and near to similar in python script
i need to write a module to detect the documents similar and near to similar.
i have read many papers of fingerprints of documents technique and others but i do not know
how to write code or implement. the algorithm should work for chines, japans English and German language or language independent
can i one help me. or sending me code this problems 
i am very thankful
thanks  
algorithem for detect documents similar and near to similar in python script
===

i need to write a module to detect the documents similar and near to similar.
i have read many papers of fingerprints of documents technique and others but i do not know
how to write code or implement. the algorithm should work for chines, japans English and German language or language independent
can i one help me. or sending me code this problems 
i am very thankful
thanks  