Python2迁移Python3遇到的问题_python2的项目如果迁移到python3,困难会在哪里-优快云博客

本文链接：https://blog.youkuaiyun.com/xiaojian0907/article/details/88023412

本文详细介绍了从Python2迁移到Python3过程中遇到的数据类型转换问题，特别是命令行输出从str类型变为bytes类型的解决方案，强调了使用decode()方法进行转换的重要性。

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Python2迁移到Python3遇到的问题

命令行输出数据类型出错
python2 中为str类型
python3中为bytes类型，需要加decode()转化为str

Python2 code：

	import subprocess
	import time
	
	
	def run_command(command_str, timeout=10, method="all"):
	    command = command_str.split(' ')
	    popen = subprocess.Popen(command,
	                             stdout=subprocess.PIPE,
	                             stderr=subprocess.PIPE,
	                             bufsize=4096)
	    poll_inteval = 0.25
	    due_time = time.time() + timeout
	    output_stdout = ""
	    while time.time() < due_time and popen.poll() == None:
	        time.sleep(poll_inteval)
	
	    if popen.poll() is None:
	        popen.terminate()
	
	    output_stdout, output_error = popen.communicate()
	    if method == "list":
	        return output_stdout
	    else:
	        return output_stdout, output_error, popen.returncode

Python3 code：

	import subprocess
	import time
	
	
	def run_command(command_str, timeout=10, method="all"):
	    command = command_str.split(' ')
	    popen = subprocess.Popen(command,
	                             stdout=subprocess.PIPE,
	                             stderr=subprocess.PIPE,
	                             bufsize=4096)
	    poll_inteval = 0.25
	    due_time = time.time() + timeout
	    output_stdout = ""
	    while time.time() < due_time and popen.poll() == None:
	        time.sleep(poll_inteval)
	
	    if popen.poll() is None:
	        popen.terminate()
	
	    output_stdout, output_error = popen.communicate()
	    if method == "list":
	        return output_stdout.decode()
	    else:
	        return output_stdout.decode(), output_error.decode(), popen.returncode