Oracle Linux中的python3子进程（wget -o）

Posted 2021-05-02

我看到python子进程上有几个帖子调用bash shell命令。但除非有人找到我遗漏的链接，否则我无法找到问题的答案。

所以这是我的代码的开始。

import os;
import subprocess;
    subprocess.call("wget ‐O /home/oracle/Downloads/puppet-repo.rpm https://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm");

当我做

wget ‐O /home/oracle/Downloads/puppet-repo.rpm https://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm

直接在终端，它的工作原理。

但我的IDE给了我FileNotFoundError: [Errno 2] No such file or directory: 'wget'

同样，我是新手在python中调用os / subprocess模块​​，我很感激有关如何有效使用这些模块的任何见解。

{更新：有了miindlek的回答，我得到了这些错误。 1 - subprocess.call(["wget", "‐O", "/home/oracle/Downloads/puppet-repo.rpm", "https://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm"])}

--2015-06-07 17:14:37--  http://%E2%80%90o/
Resolving ‐o... failed: Temporary failure in name resolution.
wget: unable to resolve host address “‐o”
/home/oracle/Downloads/puppet-repo.rpm: Scheme missing.
--2015-06-07 17:14:52--  https://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm

{与第二个bash方法subprocess.call("wget ‐O /home/oracle/Downloads/puppet-repo.rpm https://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm", shell=True)}

Resolving yum.puppetlabs.com... 198.58.114.168, 2600:3c00::f03c:91ff:fe69:6bf0
Connecting to yum.puppetlabs.com|198.58.114.168|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 10184 (9.9K) [application/x-redhat-package-manager]
Saving to: “puppetlabs-release-el-6.noarch.rpm.1”

     0K .........                                             100% 1.86M=0.005s

2015-06-07 17:14:53 (1.86 MB/s) - “puppetlabs-release-el-6.noarch.rpm.1” saved [10184/10184]

FINISHED --2015-06-07 17:14:53--
Downloaded: 1 files, 9.9K in 0.005s (1.86 MB/s)

Process finished with exit code 0

答案

您应该将命令字符串拆分为参数列表：

import subprocess
subprocess.call(["wget", "-O", "/home/oracle/Downloads/puppet-repo.rpm", "https://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm"])

您还可以使用shell选项作为替代：

import subprocess
subprocess.call("wget -O /home/oracle/Downloads/puppet-repo.rpm https://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm", shell=True)

顺便说一下，在python中你不需要在一行的末尾添加分号。

更新选项-O中的破折号是一个utf8连字符Charakter，而不是破折号。参见例如：

>>> a = "‐"  # utf8 hyphen
>>> b = "-"  # dash
>>> str(a)
'xe2x80x9'
>>> str(b)
'-'

您应删除旧破折号并将其替换为普通破折号。我更新了以前的源代码。你也可以从那里复制它。

另一答案

这听起来主要是因为你的IDE正在启动那个python子进程而不是“直接在终端中”。

这将是一个阅读建议，而不是直接回答这个问题。

检查你的IDE;阅读有关如何发布内容的文档。

1 - 在终端类型$ env，你测试$ wget

2 - 在IDE import os ; print(os.environ)

3 - 在这里阅读关于壳和Popen https://docs.python.org/3/library/subprocess.html

从那里开始学习过程。

我甚至建议更换

subprocess.call("wget -O /home/oracle/Downloads/puppet-repo.rpm https://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm", shell=True)

明确声明您想要使用什么'shell'

subprocess.Popen(['/bin/sh', '-c', 'wget' '<stuff>'])

缓解未来的IDE / shell / env假设问题。