Language Detection using gzip

import gzip
import glob
import os

#Programmed by Glob/Rekvijem/Catalyst

base = os.getcwd()

def findLanguage(text):
    #Get language files
    os.chdir(base+'/LanguageFiles')
    languagefiles = glob.glob('*.txt')

    #Get the sizes of the gzipped language files
    base_sizes = {}
    for lang in languagefiles:
        #Make a gzipped version of the file if it doesn't exist
        if not os.path.exists(lang+'.gz'):
            i = open(lang,'rb')
            o = gzip.open(lang+'.gz','wb')
            o.writelines(i)
            i.close()
            o.close()

        #Get the size of the file and append to dictionary
        name = lang.split('.')[0]
        base_sizes[name] = os.path.getsize(lang+'.gz')

    #Get the sizes of the gzipped language files with the text to be identified
    new_sizes = {}
    for lang in languagefiles:
        #Make a temporary file holding the gzipped data
        i = open(lang,'rb')
        o = gzip.open('temp.gz','wb')
        o.write(i.read()+text)
        o.close()
        i.close()

        #Get the size of the file
        name = lang.split('.')[0]
        new_sizes[name] = os.path.getsize('temp.gz')

        #Close the temporary file
        os.remove('temp.gz')

    #Calculate the difference in bytes of each file
    difference = {key : new_sizes[key] - base_sizes[key] for key in base_sizes.keys()}

    #Get the language(languages in a rare rare rare case) with the largest difference
    dif = min(difference.values())
    language = [k for k,v in difference.iteritems() if v == dif]

    #Return the language(s)
    return language

    #Alternatively return a string if only one language found:
    #return language[0] if len(language) == 1 else language
print findLanguage("In friendship diminution instrument so. Son sure paid door with say them. Two among sir sorry men court.")
print findLanguage("Gut gassen durren nun wirtin weg art hinaus neckte. Davon ri zu gutes haute in zahne wesen waren. Ja drehte arbeit wo la ja kugeln.")
print findLanguage("Terrasse et ai etrangle te bataille dissiper musiques bravoure. Continue preparer pressait que etroites empecher habitent oui. Vit ere infiniment descendons simplement eux.")