Python-сообщество

def em():
	first=''
	while len(first)<7:
		first.join(chr(random.randrange(97,122,1)))
	print first

def em():
	first=''
	while len(first)<7:
		b=chr(random.randrange(97,122,1))
		first=first+b
		print first

import random
def em():
	first=''
	second=''
	last=''
	while len(first)<7:
		b=chr(random.randrange(97,122,1))
		first=first+b
		
	while len(second)<4:
		b=chr(random.randrange(97,122,1))
		second=second+b
		
	while len(last)<2:
		b=chr(random.randrange(97,122,1))
		last=last+b
	mail=first+'@'+second+'.'+last
	
	return mail

import random
from string import ascii_lowercase
def rand_str(n):
    return ''.join(random.choice(ascii_lowercase) for _ in range(n))
def em():
    return '{}@{}.{}'.format(rand_str(7),rand_str(4),rand_str(2))