python:停止导入模块解析命令行参数
我使用的是一个外部python模块,它不是由我编写的,因此无法更改。这个名为magnum()的模块处理所有可选的命令行参数。下面是一个示例来说明该行为: 脚本1.pypython:停止导入模块解析命令行参数,python,argparse,Python,Argparse,我使用的是一个外部python模块,它不是由我编写的,因此无法更改。这个名为magnum()的模块处理所有可选的命令行参数。下面是一个示例来说明该行为: 脚本1.py #!/usr/bin/env python import magnum 执行脚本将产生: >>> ./script1.py -h [WARNING] - Python Imaging Library not found! [WARNING] - -> This means that the ImageSh
#!/usr/bin/env python
import magnum
执行脚本将产生:
>>> ./script1.py -h
[WARNING] - Python Imaging Library not found!
[WARNING] - -> This means that the ImageShapeCreator and related classes are not available!
[ INFO] - Imported FFTW wisdom from file
Usage: scipt1.py [options]
Options:
--version show program's version number and exit
-h, --help show this help message and exit
Hardware options:
Options that control which hardware is used.
-g GPU_ID enable GPU processing (using 32-bit accuracy) on cuda
device GPU_ID. The simulator will fall back to CPU
mode if it was not compiled with CUDA support or when
no CUDA capable graphics cards were detected.
-G GPU_ID enable GPU processing (using 64-bit accuracy) on cuda
device GPU_ID. TODO: Describe fallback behaviour.
-t NUM_THREADS, --threads=NUM_THREADS
enable CPU multithreading with NUM_THREADS (1..64)
threads. This parameter instructs the fftw library to
use NUM_THREADS threads for computing FFTs.
Logging options:
Options related to logging and benchmarking.
-l LEVEL, --loglevel=LEVEL
set log level (0:Debug, 1:Info, 2:Warn, 4:Error,
5:Critical), default is Debug (0).
--prof Log profiling info at program exit.
Parameter sweep options:
These options have only an effect when the simulation script uses a
Controller object to sweep through a parameter range.
-p RANGE, --param-range=RANGE
select parameter set to run, e.g. --param-range=0,64
to run sets 0 to 63.
--print-num-params print number of sweep parameters to stdout and exit.
--print-all-params print all sweep parameters to stdout and exit.
Miscellanous options:
--on_io_error=MODE Specifies what to do when an i/o error occurs when
writing an .omf/.vtk file. 0: Abort (default), 1:
Retry a few times, then abort, 2: Retry a few times,
then pause and ask for user intervention
现在我想写一个小脚本,它接受自己的命令行参数,然后使用magnum模块执行一些小计算。我想使用argparse来解析参数。但是,argparse的优先级似乎低于此外部模块的参数处理,并且无法识别我自己的参数:
脚本2.py
#!/usr/bin/env python
import argparse
import magnum
parser = argparse.ArgumentParser(
description='TEST')
parser.add_argument('--x',
help='test_arg')
args = parser.parse_args()
print args.x
称之为:
>>>./scrip2.py --x 3
[WARNING] - Python Imaging Library not found!
[WARNING] - -> This means that the ImageShapeCreator and related classes are not available!
[ INFO] - Imported FFTW wisdom from file
Usage: test.py [options]
test.py: error: no such option: --x
无论我是在magnum之前还是之后导入argparse都没有关系。如果我不导入magnum,则argparse有效:
脚本3.py
#!/usr/bin/env python
import argparse
parser = argparse.ArgumentParser(
description='TEST')
parser.add_argument('--x',
help='test_arg')
args = parser.parse_args()
print args.x
#!/usr/bin/env python
import argparse
import sys
parser = argparse.ArgumentParser(
description='TEST')
parser.add_argument('--x',
help='test_arg')
args = parser.parse_args()
sys.argv = [sys.argv[0]]
import magnum
print args.x
执行它会产生:
>>>./scrip2.py --x 3
3
我的问题是:在不编辑magnum的情况下,如何阻止magnum处理我的命令行参数?虽然我认为没有任何“好”的解决方案,但您可以使用monkeypatch argparse使其成为nop:
class EmptyParser():
def parse_args():
return
... (more redirects for add_argument)
argparse.ArgumentParser = EmptyParser
import magnum
或者,您可以将导入magnum包装到一个函数中,通过该函数创建一个接口,并在magnum解析参数之前创建参数
def magnum(param1, param2):
sys.argv = [param1, '--x', param2]
import magnum
不过,这两种方法都非常粗糙 以下是基于上述评论/答案的工作解决方案,以供将来参考: 脚本3.py
#!/usr/bin/env python
import argparse
parser = argparse.ArgumentParser(
description='TEST')
parser.add_argument('--x',
help='test_arg')
args = parser.parse_args()
print args.x
#!/usr/bin/env python
import argparse
import sys
parser = argparse.ArgumentParser(
description='TEST')
parser.add_argument('--x',
help='test_arg')
args = parser.parse_args()
sys.argv = [sys.argv[0]]
import magnum
print args.x
执行脚本表明magnum已正确导入,但参数已被解析并存储在args变量中:
>>>./script3.py --x 3
[WARNING] - Python Imaging Library not found!
[WARNING] - -> This means that the ImageShapeCreator and related classes are not available!
[ INFO] - Imported FFTW wisdom from file
[ INFO] - ----------------------------------------------------------------------
[ INFO] - MicroMagnum 0.2rc3
[ INFO] - Copyright (C) 2012 by the MicroMagnum team.
[ INFO] - This program comes with ABSOLUTELY NO WARRANTY.
[ INFO] - This is free software, and you are welcome to redistribute it under
[ INFO] - certain conditions; see the file COPYING in the distribution package.
[ INFO] - ----------------------------------------------------------------------
[ INFO] - FFTW using 1 threads from now on
[ INFO] - CUDA GPU support: no
3
此解决方案不会将任何参数转发给magnum,这正是我想要实现的。查看github源代码 导入一个包(
magnum/\uuuuu init\uuuuu.py
)。init
中的关键操作是
config.cfg.initialize(sys.argv)
它定义并创建一个cfg=MagnumConfig()
。这检查了环境。它还定义并运行optparse
解析器
因此,没有明显的方法绕过它的解析器,仍然设置计算环境。在导入magnum之前自行解析和调整sys.argv似乎是唯一的解决方案。坦白地说,我认为你做不到。如果它试图在
import
上解析参数,那么它的架构似乎很差。argparse在import上什么都不做,这就是为什么顺序不重要的原因。在使用argparse(parse_args
)后导入magnum,并将sys.argv
设置为[]
或magnum需要的任何东西。magnum看起来不像magnum
是要导入的。它可能是可导入模块的脚本前端吗?不,它实际上是要导入的。至少他们所有的文档和例子都这么说。说明:任何使用“import magnum”命令加载MicroMagnum的脚本都受以下命令行参数的约束:
。因此,此导入
旨在设置计算环境。magnum可能不使用argparse(并且从错误消息判断,它不使用argparse)抱歉,之前的注释错误。更改sys.argv后导入magnum有效。