>>> child2 = subprocess.Popen(["grep","0:0"],stdin=child1.stdout, stdout=subprocess.PIPE) >>> out = child2.communicate() subprocess.PIPE实际上为文本流提供一个缓存区。child1的stdout将文本输出到缓存区,随后child2的stdin从该PIPE中将文本读取走。child2的输出文本也被存放在PIPE中,直到communicate...
File "/usr/local/python3/lib/python3.5/subprocess.py", line 1540, in _execute_child raise child_exception_type(errno_num, err_msg)OSError: [Errno 8] Exec format error caihuyougui 邻接矩阵 12 flask新版已经改成【flask run】命令行启动服务器了,买本新版狗书重头开始学吧。登录...
File "/usr/lib/python3.10/subprocess.py", line 971, in init self._execute_child(args, executable, preexec_fn, close_fds, File "/usr/lib/python3.10/subprocess.py", line 1863, in _execute_child raise child_exception_type(errno_num, err_msg, err_filename) FileNotFoundError: [Errno 2] ...
errread, errwrite) File "/usr/local/lib/python2.7/subprocess.py", line 1228, in _execute_child raise child_exception OSError: [Errno 2] No such file or directory 异常子进程里抛出的异常,会在父进程中再次抛出。并且,异常会有个叫child_traceback的额外属性,这是个包含子进程错误traceback 信息的...
这种层次结构是有意为之的,大部分异常都继承自Exception,强烈建议所有的用户自定义异常也都应是Exception的子类,而不要是BaseException的子类。理由如下。 1. try: # 执行一些异常操作 ...
strerror(errno_num) raise child_exception_type(errno_num, err_msg, err_filename) That comment is wrong - there's now many things that can fail in the noexec phase in Modules/_posixsubprocess.c, all of which (besides preexec_fn) report errno to the parent as OSError. Here's a couple...
raise child_exception OSError: [Errno 2] No such file or directory 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 异常子进程里抛出的异常,会在父进程中再次抛出。并且,异常会有个叫child_traceback的额外属性,这是个包含子进程错误traceback信息的字符串。遇到最多的错...
class FooError(Exception): def __init__(self,msg): self.message = msg def __str__(self): return self.message try: raise FooError('自定义异常FooError.') except FooError as e: print(e) 案例2:raise向上级抛异常 原版: # err.py ...
restore_signals,start_new_session)File"/usr/lib64/python3.6/subprocess.py",line1364,in_execute_childraisechild_exception_type(errno_num,err_msg,err_filename)FileNotFoundError:[Errno2]No suchfileordirectory:'cat /home/www/running/os-app-api/nohup.out |grep 2019-10-28 > ~/nohup-2019-10-...
raise child_exceptionOSError:[Errno2]No such file or directory 4、subprocess.getstatusoutput() 接受字符串形式的命令,返回 一个元组形式的结果,第一个元素是命令执行状态,第二个为执行结果 代码语言:javascript 复制 #执行正确>>>subprocess.getstatusoutput('pwd')(0,'/root')#执行错误>>>subprocess.getst...