import os
class Corpus:        
        def __init__(self, adres):
                self.adres=adres
        def emails_as_string(self):
                data=os.listdir(adres)
                j=len(data)
                i=0
                while i < j:
                        a=(data[i])
                        if a[0]==('!'):
                                j=j-1
                                i=i-1
                                del data[0]
                                i=i+1
                for i in range(j):
                        fname=data[i]
                        l=(adres+data[i])
                        l=l.rstrip()
                        a_file=open(l)
                        body=a_file.read()
                        return(body,fname)

corpus = Corpus(r'\path\to\directory\with\emails')
И 
for fname, body in corpus.emails_as_string():
    print(fname)
    print(body)
    print('-------------------------')
    count += 1
print('Finished: ', count, 'files processed.')

import corpus
mc = corpus.Corpus('C:/1/')
for fname, body in mc.emails_as_string():
	 print(fname)
	 print(body)

        def emails_as_string(self):
                adres=self.adres
                data=os.listdir(adres)

>>> import corpus
>>> mc= corpus.Corpus('C:/1/')
>>> for fname, body in mc.emails_as_string():
	print(fname, body)








.

import os
import os
class Corpus:
    def __init__(self, adres):
        self.adres=adres

    def emails_as_string(self):
        for fname in os.listdir(self.adres):
            if fname.startswith('!'):
                continue
            fullpath =os.path.join(self.adres, fname)

            if os.path.isfile(fullpath):
                yield open(fullpath).read(), fname



mails = Corpus(r'E:\test')

for x in mails.emails_as_string():
    print x