subprocess模块

subprocess可以根据命令的结果，正确的或者错误的分开存放

存放正确的结果

# import subprocess
# obj=subprocess.Popen('tasklist',shell=True,
#                  stdout=subprocess.PIPE,
#                  stderr=subprocess.PIPE,
#                  )


# print(obj.stdout.read().decode('gbk')) #编码处理

存放错误的结果

# import subprocess
# import time
# obj=subprocess.Popen('taaaaaaaaaaaaaaaasklist',shell=True,
#                  stdout=subprocess.PIPE,
#                  stderr=subprocess.PIPE,
#                      )
# print(obj.stderr.read().decode('gbk'))
# # 'taaaaaaaaaaaaaaaasklist' 不是内部或外部命令，也不是可运行的程序或批处理文件。

实现命令的过滤例如 tasklist|findstr python

import subprocess
obj1=subprocess.Popen('tasklist',shell=True,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
                 )
obj2=subprocess.Popen('findstr python',shell=True,
                 stdin=obj1.stdout,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
                 )
print(obj2.stdout.read().decode('gbk')) #python.exe         16988 Console         24     11,216 K

相当于

import subprocess
obj1=subprocess.Popen('tasklist|findstr python',shell=True,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
                 )