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python 巡檢腳本的項(xiàng)目實(shí)踐

 更新時(shí)間:2023年04月24日 10:02:29   作者:淺笑若風(fēng)  
本文主要介紹了python 巡檢腳本的項(xiàng)目實(shí)踐,文中通過示例代碼介紹的非常詳細(xì),對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

方法一、使用os模塊的system方法

os.system(cmd),其返回值是shell指令運(yùn)行后返回的狀態(tài)碼,
int類型,
0--表示shell指令成功執(zhí)行,
256--表示shell未找到,
該方法適用于shell命令不需要輸出內(nèi)容的場景。

方法二、使用os.popen()

該方法以文件的形式返回shell指令運(yùn)行后的結(jié)果,
需要獲取內(nèi)容時(shí)可使用read()或readlines()方法,舉例如下:

方法三、使用commands模塊,有三個(gè)方法可以使用

(1)commands.getstatusoutput(cmd),其以字符串的形式返回的是輸出結(jié)果和狀態(tài)碼,即(status,output)。

(2)commands.getoutput(cmd),返回cmd的輸出結(jié)果。

(3)commands.getstatus(file),返回ls -l file的執(zhí)行結(jié)果字符串,調(diào)用了getoutput,不建議使用此方法

方法四、subprocess模塊

允許創(chuàng)建很多子進(jìn)程,創(chuàng)建的時(shí)候能指定子進(jìn)程和子進(jìn)程的輸入、輸出、錯(cuò)誤輸出管道,執(zhí)行后能獲取輸出結(jié)果和執(zhí)行狀態(tài)。

(1)subprocess.run():python3.5中新增的函數(shù), 執(zhí)行指定的命令, 等待命令執(zhí)行完成后返回一個(gè)包含執(zhí)行結(jié)果的CompletedProcess類的實(shí)例。

(2)subprocess.call():執(zhí)行指定的命令, 返回命令執(zhí)行狀態(tài), 功能類似os.system(cmd)。

(3)subprocess.check_call():python2.5中新增的函數(shù), 執(zhí)行指定的命令, 如果執(zhí)行成功則返回狀態(tài)碼, 否則拋出異常。

說明:subprocess.run(args, *, stdin=None, input=None, stdout=None, stderr=None, shell=False, timeout=None, check=False, universal_newlines=False)

   subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False, timeout=None)

   subprocess.check_call(args, *, stdin=None, stdout=None, stderr=None, shell=False, timeout=None)

   args:表示shell指令,若以字符串形式給出shell指令,如"ls -l "則需要使shell = Ture。否則默認(rèn)已數(shù)組形式表示shell變量,如"ls","-l"。

當(dāng)使用比較復(fù)雜的shell語句時(shí),可以先使用shlex模塊的shlex.split()方法來幫助格式化命令,然后在傳遞給run()方法或Popen。

附上python2.7中的subprocess模塊源碼供理解(pycharm查看方法源碼,ctrl+左鍵)。

# Stubs for subprocess

# Based on http://docs.python.org/2/library/subprocess.html and Python 3 stub

from typing import Sequence, Any, Mapping, Callable, Tuple, IO, Union, Optional, List, Text

_FILE = Union[None, int, IO[Any]]
_TXT = Union[bytes, Text]
_CMD = Union[_TXT, Sequence[_TXT]]
_ENV = Union[Mapping[bytes, _TXT], Mapping[Text, _TXT]]

# Same args as Popen.__init__
def call(args: _CMD,
         bufsize: int = ...,
         executable: _TXT = ...,
         stdin: _FILE = ...,
         stdout: _FILE = ...,
         stderr: _FILE = ...,
         preexec_fn: Callable[[], Any] = ...,
         close_fds: bool = ...,
         shell: bool = ...,
         cwd: _TXT = ...,
         env: _ENV = ...,
         universal_newlines: bool = ...,
         startupinfo: Any = ...,
         creationflags: int = ...) -> int: ...

def check_call(args: _CMD,
               bufsize: int = ...,
               executable: _TXT = ...,
               stdin: _FILE = ...,
               stdout: _FILE = ...,
               stderr: _FILE = ...,
               preexec_fn: Callable[[], Any] = ...,
               close_fds: bool = ...,
               shell: bool = ...,
               cwd: _TXT = ...,
               env: _ENV = ...,
               universal_newlines: bool = ...,
               startupinfo: Any = ...,
               creationflags: int = ...) -> int: ...

# Same args as Popen.__init__ except for stdout
def check_output(args: _CMD,
                 bufsize: int = ...,
                 executable: _TXT = ...,
                 stdin: _FILE = ...,
                 stderr: _FILE = ...,
                 preexec_fn: Callable[[], Any] = ...,
                 close_fds: bool = ...,
                 shell: bool = ...,
                 cwd: _TXT = ...,
                 env: _ENV = ...,
                 universal_newlines: bool = ...,
                 startupinfo: Any = ...,
                 creationflags: int = ...) -> bytes: ...

PIPE = ...  # type: int
STDOUT = ...  # type: int

class CalledProcessError(Exception):
    returncode = 0
    # morally: _CMD
    cmd = ...  # type: Any
    # morally: Optional[bytes]
    output = ...  # type: Any

    def __init__(self,
                 returncode: int,
                 cmd: _CMD,
                 output: Optional[bytes] = ...) -> None: ...

class Popen:
    stdin = ...  # type: Optional[IO[Any]]
    stdout = ...  # type: Optional[IO[Any]]
    stderr = ...  # type: Optional[IO[Any]]
    pid = 0
    returncode = 0

    def __init__(self,
                 args: _CMD,
                 bufsize: int = ...,
                 executable: Optional[_TXT] = ...,
                 stdin: Optional[_FILE] = ...,
                 stdout: Optional[_FILE] = ...,
                 stderr: Optional[_FILE] = ...,
                 preexec_fn: Optional[Callable[[], Any]] = ...,
                 close_fds: bool = ...,
                 shell: bool = ...,
                 cwd: Optional[_TXT] = ...,
                 env: Optional[_ENV] = ...,
                 universal_newlines: bool = ...,
                 startupinfo: Optional[Any] = ...,
                 creationflags: int = ...) -> None: ...

    def poll(self) -> int: ...
    def wait(self) -> int: ...
    # morally: -> Tuple[Optional[bytes], Optional[bytes]]
    def communicate(self, input: Optional[_TXT] = ...) -> Tuple[Any, Any]: ...
    def send_signal(self, signal: int) -> None: ...
    def terminate(self) -> None: ...
    def kill(self) -> None: ...
    def __enter__(self) -> 'Popen': ...
    def __exit__(self, type, value, traceback) -> bool: ...

# Windows-only: STARTUPINFO etc.

STD_INPUT_HANDLE = ...  # type: Any
STD_OUTPUT_HANDLE = ...  # type: Any
STD_ERROR_HANDLE = ...  # type: Any
SW_HIDE = ...  # type: Any
STARTF_USESTDHANDLES = ...  # type: Any
STARTF_USESHOWWINDOW = ...  # type: Any
CREATE_NEW_CONSOLE = ...  # type: Any
CREATE_NEW_PROCESS_GROUP = ...  # type: Any

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