python - 如何让 Maven 与 Python 子进程一起工作？

Question

我正在尝试编写 Python 脚本来自动执行一些 Maven 命令。

以下 Python 代码不起作用:

import subprocess
args = ['mvn', '-version']
process = subprocess.Popen(args, stdout=subprocess.PIPE)

导致以下错误:

Traceback (most recent call last):
  File "<pyshell#2>", line 1, in <module>
    process = subprocess.Popen(args, stdout=subprocess.PIPE)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1249, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

下一步，我向子进程提供 mvn 二进制文件的完整路径:

import subprocess
args = ['/usr/local/Cellar/maven/3.2.3/libexec/bin/mvn', '-version']
process = subprocess.Popen(args, stderr=subprocess.PIPE)
out, err = process.communicate()

此命令更进一步，但打印 err 显示以下投诉:

Error: JAVA_HOME is not defined correctly.
  We cannot execute /usr/libexec/java_home/bin/java

作为完整性检查，我在自己的终端上验证 JAVA_HOME 是否设置正确:

$ mvn -version
Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-11T16:58:10-04:00)
Maven home: /usr/local/Cellar/maven/3.2.3/libexec
Java version: 1.8.0_25, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.9.5", arch: "x86_64", family: "mac"

我还可以在终端上轻松运行 mvn。

我的问题是:为什么子进程不能运行 mvn，我怎样才能让它这样做？

Answer 1

使用

process = subprocess.Popen(args,shell=True)