在解决一个实时获取命令行输出的问题时,通过查找资料,发现一个从subprocess运行的子进程中实时获取输出的方法,程序如下:
import shlex
import subprocess
if __name__ == '__main__':
shell_cmd = 'ping www.baidu.com'
cmd = shlex.split(shell_cmd)
p = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
while p.poll() is None:
line = p.stdout.readline()
line = line.strip()
if line:
print(line)
if p.returncode == 0:
print('Subprogram success')
else:
print('Subprogram failed')
在命令行输入“ping www.baidu.com”会得到如下输出信息:
但该程序运行的输出却是这样的:
也就是这里输出的是bytes类型的数据,而我们想要的是含有汉字的str类型的数据,bytes转str有以下两种方法:
s1 = str(line, encoding='utf-8')
s2 = line.decode('utf-8')
但是,改过之后运行程序时却报错了:
Traceback (most recent call last):
File "E:/PycharmProjects/Video_Crack/test.py", line 13, in
s1 = str(line, encoding='utf-8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd5 in position 0: invalid continuation byte
Process finished with exit code 1
翻到了一篇博客,里面有这么一段话:
如果python中所要处理的字符串中包含中文,那么最好要搞懂所用字符的编码,是gbk/gb2312/gb18030,还是utf-8,否则容易出现乱码,以及此处的语法错误。
尝试将编码方式改为“gbk”或者“gb2312”以及“gb18030”之后,输出就正常了,这说明原来的中文字符是采用gbk/gb2312/gb18030编码的。
import shlex
import subprocess
if __name__ == '__main__':
shell_cmd = 'ping www.baidu.com'
cmd = shlex.split(shell_cmd)
p = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
while p.poll() is None:
line = p.stdout.readline()
line = line.strip()
if line:
s1 = str(line, encoding='gbk')
print(s1)
if p.returncode == 0:
print('Subprogram success')
else:
print('Subprogram failed')
参考博文:
Python:从subprocess运行的子进程中实时获取输出
浅析Python3中的bytes和str类型
python编码错误:UnicodeDecodeError: 'utf8' codec can't decode