in __init__ subprocess_call(cmd, logger=None)
时间: 2024-05-21 12:17:34 浏览: 15
这是一个Python函数的定义,其中包含一个名为`__init__`的特殊方法。该方法用于在创建类的新实例时初始化对象。在这个函数中,`subprocess_call`和`logger`是参数,`cmd`是subprocess_call函数的必需参数。在函数体内,它调用了一个名为`subprocess_call`的函数,并将`cmd`和`logger`传递给它。如果`logger`参数没有被传递,它将默认为None。
相关问题
subprocess.check_call
subprocess.check_call is a Python method that is used to execute a command or a program in a new process. It is a blocking call, which means that the calling process will wait for the command to complete before continuing execution. If the command returns a non-zero exit status, a CalledProcessError will be raised. This method is commonly used for running shell commands in Python scripts.
Syntax:
```
subprocess.check_call(args, *, stdin=None, stdout=None, stderr=None, shell=False, cwd=None, timeout=None, encoding=None, errors=None)
```
Parameters:
- args: A string or a sequence containing the command to be executed and its arguments.
- stdin: A file-like object representing the standard input of the command. If None, the standard input is redirected to /dev/null.
- stdout: A file-like object representing the standard output of the command. If None, the standard output is redirected to /dev/null.
- stderr: A file-like object representing the standard error of the command. If None, the standard error is redirected to stdout.
- shell: A boolean value indicating whether the command should be executed in a shell or not. If True, the command is executed in a shell. If False, the command is executed directly.
- cwd: The working directory in which the command should be executed.
- timeout: The maximum amount of time in seconds that the command is allowed to run. If the command takes longer than the specified timeout, a TimeoutExpired error is raised.
- encoding: The character encoding to be used for the standard input, output, and error streams.
- errors: The error handling strategy to be used for the standard input, output, and error streams.
Return Value:
- This method returns None if the command is executed successfully. If the command returns a non-zero exit status, a CalledProcessError is raised.
from subprocess import check_call
这段代码是用于执行外部命令的,具体来说,`check_call` 函数可以调用指定的命令行命令,并等待其执行完毕后返回状态码。如果命令执行成功,该函数返回 0,否则抛出一个 `CalledProcessError` 异常。该函数的语法如下:
```python
check_call(args, *, stdin=None, stdout=None, stderr=None, shell=False)
```
其中,`args` 参数是要执行的命令,可以是一个字符串或一个包含命令及参数的列表或元组。`stdin`、`stdout` 和 `stderr` 参数用于指定标准输入、标准输出和标准错误的流,可以是一个文件对象、文件描述符或类文件对象。`shell` 参数用于指定是否使用 shell 执行命令,如果为 `True`,则命令将被包装在 shell 中执行。
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