May be simplest solution for Python
print'*'*11
and for Py3K
print('*'*13)
and another generic solution for Py3K
import random, sys
def main():
f = open(__file__).read()
d = ' \t\n'
r = ''.join(chr(c) for c in range(33, 127))
sys.stdout.write(''.join(c if c in d else random.choice(r) for c in f))
if __name__ == '__main__':
main()