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#!/usr/bin/env python3

# -*- coding: utf-8 -*-

from io import StringIO

# write to StringIO:

f = StringIO()

f.write('hello')

f.write(' ')

f.write('world!')

print(f.getvalue())

# read from StringIO:

f = StringIO('水面细风生，\n菱歌慢慢声。\n客亭临小市，\n灯火夜妆明。')

while True:

s = f.readline()

if s == '':

break

print(s.strip())