StringIO简单用法

from cStringIO import StringIO

output = StringIO()
output.write("This goes into the buffer.")
print >>output, 'And so does this.' #连接字符串
print output.getvalue()
output.close()

input = StringIO('Inital value for read buffer')
print input.read()
input.write(' leon-test') #如果加载的是cStringIO模块，则抛错，一旦StringIO()构造函数有值，则write方法无效
input.seek(0)
print input.read()