使用python -m下载文件?

使用python -m下载文件?

python 能否只使用 python -m 命令参数 ,加一个文件 https://url.com/1.txt ,将这个文件下载下来?

文件下载


回答:

可以啊,首先说明一下,一般不需要这么费事,一个 单py文件 就可以做到,不知道你的实际用途是什么?

其次说明一下 python -m 的含义是运行一个module(也就是一个模块-可以理解为一个目录),你运行 python3 -h 可以得到如下输出:

Options and arguments (and corresponding environment variables):

-b : issue warnings about str(bytes_instance), str(bytearray_instance)

and comparing bytes/bytearray with str. (-bb: issue errors)

-B : don't write .pyc files on import; also PYTHONDONTWRITEBYTECODE=x

-c cmd : program passed in as string (terminates option list)

-d : debug output from parser; also PYTHONDEBUG=x

-E : ignore PYTHON* environment variables (such as PYTHONPATH)

-h : print this help message and exit (also --help)

-i : inspect interactively after running script; forces a prompt even

if stdin does not appear to be a terminal; also PYTHONINSPECT=x

-I : isolate Python from the user's environment (implies -E and -s)

-m mod : run library module as a script (terminates option list)

-O : remove assert and __debug__-dependent statements; add .opt-1 before

.pyc extension; also PYTHONOPTIMIZE=x

-OO : do -O changes and also discard docstrings; add .opt-2 before

.pyc extension

-q : don't print version and copyright messages on interactive startup

-s : don't add user site directory to sys.path; also PYTHONNOUSERSITE

-S : don't imply 'import site' on initialization

-u : force the stdout and stderr streams to be unbuffered;

this option has no effect on stdin; also PYTHONUNBUFFERED=x

-v : verbose (trace import statements); also PYTHONVERBOSE=x

can be supplied multiple times to increase verbosity

-V : print the Python version number and exit (also --version)

when given twice, print more information about the build

-W arg : warning control; arg is action:message:category:module:lineno

also PYTHONWARNINGS=arg

-x : skip first line of source, allowing use of non-Unix forms of #!cmd

-X opt : set implementation-specific option. The following options are available:

-X faulthandler: enable faulthandler

-X showrefcount: output the total reference count and number of used

memory blocks when the program finishes or after each statement in the

interactive interpreter. This only works on debug builds

-X tracemalloc: start tracing Python memory allocations using the

tracemalloc module. By default, only the most recent frame is stored in a

traceback of a trace. Use -X tracemalloc=NFRAME to start tracing with a

traceback limit of NFRAME frames

-X showalloccount: output the total count of allocated objects for each

type when the program finishes. This only works when Python was built with

COUNT_ALLOCS defined

-X importtime: show how long each import takes. It shows module name,

cumulative time (including nested imports) and self time (excluding

nested imports). Note that its output may be broken in multi-threaded

application. Typical usage is python3 -X importtime -c 'import asyncio'

-X dev: enable CPython's "development mode", introducing additional runtime

checks which are too expensive to be enabled by default. Effect of the

developer mode:

* Add default warning filter, as -W default

* Install debug hooks on memory allocators: see the PyMem_SetupDebugHooks() C function

* Enable the faulthandler module to dump the Python traceback on a crash

* Enable asyncio debug mode

* Set the dev_mode attribute of sys.flags to True

* io.IOBase destructor logs close() exceptions

-X utf8: enable UTF-8 mode for operating system interfaces, overriding the default

locale-aware mode. -X utf8=0 explicitly disables UTF-8 mode (even when it would

otherwise activate automatically)

-X pycache_prefix=PATH: enable writing .pyc files to a parallel tree rooted at the

given directory instead of to the code tree

--check-hash-based-pycs always|default|never:

control how Python invalidates hash-based .pyc files

file : program read from script file

- : program read from stdin (default; interactive mode if a tty)

arg ...: arguments passed to program in sys.argv[1:]

Other environment variables:

PYTHONSTARTUP: file executed on interactive startup (no default)

PYTHONPATH : ';'-separated list of directories prefixed to the

default module search path. The result is sys.path.

PYTHONHOME : alternate <prefix> directory (or <prefix>;<exec_prefix>).

The default module search path uses <prefix>\python{major}{minor}.

PYTHONCASEOK : ignore case in 'import' statements (Windows).

PYTHONUTF8: if set to 1, enable the UTF-8 mode.

PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.

PYTHONFAULTHANDLER: dump the Python traceback on fatal errors.

PYTHONHASHSEED: if this variable is set to 'random', a random value is used

to seed the hashes of str and bytes objects. It can also be set to an

integer in the range [0,4294967295] to get hash values with a

predictable seed.

PYTHONMALLOC: set the Python memory allocators and/or install debug hooks

on Python memory allocators. Use PYTHONMALLOC=debug to install debug

hooks.

PYTHONCOERCECLOCALE: if this variable is set to 0, it disables the locale

coercion behavior. Use PYTHONCOERCECLOCALE=warn to request display of

locale coercion and locale compatibility warnings on stderr.

PYTHONBREAKPOINT: if this variable is set to 0, it disables the default

debugger. It can be set to the callable of your debugger of choice.

PYTHONDEVMODE: enable the development mode.

PYTHONPYCACHEPREFIX: root directory for bytecode cache (pyc) files.

可以看到 -m mod : run library module as a script (terminates option list)-m 代表的意思是作为一个脚本去运行一个模块。

那么你可以在一个目录下创建一个 __main__.py,然后这个目录就会被认为是一个模块(module),就可以通过你想要的方式去执行逻辑。

# __main__.py

import sys

print(f"我要下载文件: {sys.argv[1]}")

然后执行命令:

python3 -m <目录名> https://url.com/1.txt

输出:

我要下载文件: https://url.com/1.txt

剩下的逻辑自己实现就行了。


回答:

我猜你是想要一个执行方式和 python -m http.server 8000 一样的工具。默认的模块貌似是没有实现直接download的功能的。需要的话,可以自己实现一个放在模块目录下面,再通过 python -m download http://xxx.com/xxx 调用。


回答:

我猜你是不是想要wget

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