我想编写一些代码将数据放入管道中,希望解决方案能够兼容Python 2.6+和3.x。示例:
from __future__ import print_function
import subprocess
import sys
if(sys.version_info > (3,0)):
print ("using python3")
def raw_input(*prmpt):
"""in python3, input behaves like raw_input in python2"""
return input(*prmpt)
class pipe(object):
def __init__(self,openstr):
self.gnuProcess=subprocess.Popen(openstr.split(),
stdin=subprocess.PIPE)
def putInPipe(self,mystr):
print(mystr, file=self.gnuProcess.stdin)
if(__name__=="__main__"):
print("This simple program just echoes what you say (control-d to exit)")
p=pipe("cat -")
while(True):
try:
inpt=raw_input()
except EOFError:
break
print('putting in pipe:%s'%inpt)
p.putInPipe(inpt)
以上代码适用于Python 2.6,但在Python 3.2中失败(请注意,以上代码大部分是使用2to3生成的 - 我只是稍微修改了一下以使其与Python 2.6兼容。)
Traceback (most recent call last):
File "test.py", line 30, in <module>
p.putInPipe(inpt)
File "test.py", line 18, in putInPipe
print(mystr, file=self.gnuProcess.stdin)
TypeError: 'str' does not support the buffer interface
我尝试了这里建议的bytes函数(例如print(bytes(mystr,'ascii')), TypeError: 'str' does not support the buffer interface, 但似乎不起作用。 有什么建议吗?