从相对路径导入模块

发布于 2024-07-08 20:39:44 字数 385 浏览 9 评论 0原文

如何在给定相对路径的情况下导入 Python 模块?

例如,如果 dirFoo 包含 Foo.pydirBar,并且 dirBar 包含 Bar.py< /code>,如何将 Bar.py 导入到 Foo.py 中?

下面是一个直观的表示:

dirFoo\
    Foo.py
    dirBar\
        Bar.py

Foo 希望包含 Bar,但重组文件夹层次结构不是一个选项。

How do I import a Python module given its relative path?

For example, if dirFoo contains Foo.py and dirBar, and dirBar contains Bar.py, how do I import Bar.py into Foo.py?

Here's a visual representation:

dirFoo\
    Foo.py
    dirBar\
        Bar.py

Foo wishes to include Bar, but restructuring the folder hierarchy is not an option.

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评论(22

简单 2024-07-15 20:39:44

假设您的两个目录都是真正的 Python 包(其中确实有 __init__.py 文件),这里有一个安全的解决方案,用于包含相对于脚本位置的模块。

我假设您想要这样做,因为您需要在脚本中包含一组模块。 我在多个产品的生产中使用它,并在许多特殊场景中工作,例如:从另一个目录调用脚本或使用 python 执行执行脚本,而不是打开新的解释器。

 import os, sys, inspect
 # realpath() will make your script run, even if you symlink it :)
 cmd_folder = os.path.realpath(os.path.abspath(os.path.split(inspect.getfile( inspect.currentframe() ))[0]))
 if cmd_folder not in sys.path:
     sys.path.insert(0, cmd_folder)

 # Use this if you want to include modules from a subfolder
 cmd_subfolder = os.path.realpath(os.path.abspath(os.path.join(os.path.split(inspect.getfile( inspect.currentframe() ))[0],"subfolder")))
 if cmd_subfolder not in sys.path:
     sys.path.insert(0, cmd_subfolder)

 # Info:
 # cmd_folder = os.path.dirname(os.path.abspath(__file__)) # DO NOT USE __file__ !!!
 # __file__ fails if the script is called in different ways on Windows.
 # __file__ fails if someone does os.chdir() before.
 # sys.argv[0] also fails, because it doesn't not always contains the path.

作为奖励,这种方法确实可以让你强制 Python 使用你的模块而不是系统上安装的模块。

警告! 我真的不知道当当前模块位于 Egg 文件中时会发生什么。 大概也会失败吧。

Assuming that both your directories are real Python packages (do have the __init__.py file inside them), here is a safe solution for inclusion of modules relatively to the location of the script.

I assume that you want to do this, because you need to include a set of modules with your script. I use this in production in several products and works in many special scenarios like: scripts called from another directory or executed with python execute instead of opening a new interpreter.

 import os, sys, inspect
 # realpath() will make your script run, even if you symlink it :)
 cmd_folder = os.path.realpath(os.path.abspath(os.path.split(inspect.getfile( inspect.currentframe() ))[0]))
 if cmd_folder not in sys.path:
     sys.path.insert(0, cmd_folder)

 # Use this if you want to include modules from a subfolder
 cmd_subfolder = os.path.realpath(os.path.abspath(os.path.join(os.path.split(inspect.getfile( inspect.currentframe() ))[0],"subfolder")))
 if cmd_subfolder not in sys.path:
     sys.path.insert(0, cmd_subfolder)

 # Info:
 # cmd_folder = os.path.dirname(os.path.abspath(__file__)) # DO NOT USE __file__ !!!
 # __file__ fails if the script is called in different ways on Windows.
 # __file__ fails if someone does os.chdir() before.
 # sys.argv[0] also fails, because it doesn't not always contains the path.

As a bonus, this approach does let you force Python to use your module instead of the ones installed on the system.

Warning! I don't really know what is happening when current module is inside an egg file. It probably fails too.

踏雪无痕 2024-07-15 20:39:44

确保 dirBar 具有 __init__.py 文件——这会将目录放入 Python 包中。

Be sure that dirBar has the __init__.py file -- this makes a directory into a Python package.

奈何桥上唱咆哮 2024-07-15 20:39:44

您还可以将该子目录添加到 Python 路径中,以便将其作为普通脚本导入。

import sys
sys.path.insert(0, <path to dirFoo>)
import Bar

You could also add the subdirectory to your Python path so that it imports as a normal script.

import sys
sys.path.insert(0, <path to dirFoo>)
import Bar
说好的呢 2024-07-15 20:39:44
import os
import sys
lib_path = os.path.abspath(os.path.join(__file__, '..', '..', '..', 'lib'))
sys.path.append(lib_path)

import mymodule
import os
import sys
lib_path = os.path.abspath(os.path.join(__file__, '..', '..', '..', 'lib'))
sys.path.append(lib_path)

import mymodule
风吹雨成花 2024-07-15 20:39:44

只需执行简单的操作即可从不同的文件夹导入 .py 文件。

假设您有一个类似的目录:

lib/abc.py

然后只需在 lib 文件夹中保留一个名为的空文件

__init__.py

然后使用

from lib.abc import <Your Module name>

在导入模块层次结构的每个文件夹中保留 __init__.py 文件。

Just do simple things to import the .py file from a different folder.

Let's say you have a directory like:

lib/abc.py

Then just keep an empty file in lib folder as named

__init__.py

And then use

from lib.abc import <Your Module name>

Keep the __init__.py file in every folder of the hierarchy of the import module.

趴在窗边数星星i 2024-07-15 20:39:44

如果您以这种方式构建您的项目:

src\
  __init__.py
  main.py
  dirFoo\
    __init__.py
    Foo.py
  dirBar\
    __init__.py
    Bar.py

那么从 Foo.py 您应该能够执行以下操作:

import dirFoo.Foo

或者:

from dirFoo.Foo import FooObject

根据 Tom 的评论,这确实要求可以通过 site_packagessrc 文件夹code> 或您的搜索路径。 此外,正如他提到的,当您第一次在该包/目录中导入模块时,__init__.py 会被隐式导入。 通常 __init__.py 只是一个空文件。

If you structure your project this way:

src\
  __init__.py
  main.py
  dirFoo\
    __init__.py
    Foo.py
  dirBar\
    __init__.py
    Bar.py

Then from Foo.py you should be able to do:

import dirFoo.Foo

Or:

from dirFoo.Foo import FooObject

Per Tom's comment, this does require that the src folder is accessible either via site_packages or your search path. Also, as he mentions, __init__.py is implicitly imported when you first import a module in that package/directory. Typically __init__.py is simply an empty file.

假情假意假温柔 2024-07-15 20:39:44

这是相关的 PEP:

http://www.python.org/dev/peps /pep-0328/

特别是,假设 dirFoo 是 dirBar 之上的目录...

在 dirFoo\Foo.py 中:

from .dirBar import Bar

This is the relevant PEP:

http://www.python.org/dev/peps/pep-0328/

In particular, presuming dirFoo is a directory up from dirBar...

In dirFoo\Foo.py:

from .dirBar import Bar
初心 2024-07-15 20:39:44

最简单的方法是使用 sys.path.append()。

但是,您可能还对 imp 模块感兴趣。
它提供对内部导入功能的访问。

# mod_name is the filename without the .py/.pyc extention
py_mod = imp.load_source(mod_name,filename_path) # Loads .py file
py_mod = imp.load_compiled(mod_name,filename_path) # Loads .pyc file 

当您不知道模块名称时,这可用于动态加载模块。

我过去曾使用它来创建应用程序的插件类型接口,用户可以在其中编写具有应用程序特定功能的脚本,然后将其脚本放入特定目录中。

此外,这些功能可能很有用:

imp.find_module(name[, path])
imp.load_module(name, file, pathname, description)

The easiest method is to use sys.path.append().

However, you may be also interested in the imp module.
It provides access to internal import functions.

# mod_name is the filename without the .py/.pyc extention
py_mod = imp.load_source(mod_name,filename_path) # Loads .py file
py_mod = imp.load_compiled(mod_name,filename_path) # Loads .pyc file 

This can be used to load modules dynamically when you don't know a module's name.

I've used this in the past to create a plugin type interface to an application, where the user would write a script with application specific functions, and just drop thier script in a specific directory.

Also, these functions may be useful:

imp.find_module(name[, path])
imp.load_module(name, file, pathname, description)
千鲤 2024-07-15 20:39:44

无需对脚本进行任何修改的最简单方法是设置 PYTHONPATH 环境变量。 因为 sys.path 是从这些位置初始化的:

  1. 包含输入脚本(或当前脚本)的目录
    目录)。
  2. PYTHONPATH(目录名称列表,具有相同的
    语法与 shell 变量 PATH 相同)。
  3. 依赖于安装的默认值。

只需运行:

export PYTHONPATH=/absolute/path/to/your/module

您的 sys.path 将包含上述路径,如下所示:

print sys.path

['', '/absolute/path/to/your/module', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PIL', '/usr/lib/python2.7/dist-packages/gst-0.10', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/ubuntu-sso-client', '/usr/lib/python2.7/dist-packages/ubuntuone-client', '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel', '/usr/lib/python2.7/dist-packages/ubuntuone-couch', '/usr/lib/python2.7/dist-packages/ubuntuone-installer', '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol']

The easiest way without any modification to your script is to set PYTHONPATH environment variable. Because sys.path is initialized from these locations:

  1. The directory containing the input script (or the current
    directory).
  2. PYTHONPATH (a list of directory names, with the same
    syntax as the shell variable PATH).
  3. The installation-dependent default.

Just run:

export PYTHONPATH=/absolute/path/to/your/module

You sys.path will contains above path, as show below:

print sys.path

['', '/absolute/path/to/your/module', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PIL', '/usr/lib/python2.7/dist-packages/gst-0.10', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/ubuntu-sso-client', '/usr/lib/python2.7/dist-packages/ubuntuone-client', '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel', '/usr/lib/python2.7/dist-packages/ubuntuone-couch', '/usr/lib/python2.7/dist-packages/ubuntuone-installer', '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol']
挽容 2024-07-15 20:39:44

在我看来,最好的选择是将 __ init __.py 放在文件夹中并使用 调用该文件。

from dirBar.Bar import *

不建议使用 sys.path.append() 因为如果使用可能会出现问题与现有 python 包的文件名相同。 我还没有测试过,但这会很模糊。

In my opinion the best choice is to put __ init __.py in the folder and call the file with

from dirBar.Bar import *

It is not recommended to use sys.path.append() because something might gone wrong if you use the same file name as the existing python package. I haven't test that but that will be ambiguous.

晚雾 2024-07-15 20:39:44
from .dirBar import Bar

而不是:

from dirBar import Bar

以防万一可能安装了另一个 dirBar 并使 foo.py 读者感到困惑。

from .dirBar import Bar

instead of:

from dirBar import Bar

just in case there could be another dirBar installed and confuse a foo.py reader.

七秒鱼° 2024-07-15 20:39:44

对于将 Bar.py 导入到 Foo.py 的情况,首先我会将这些文件夹转换为 Python 包,如下所示:

dirFoo\
    __init__.py
    Foo.py
    dirBar\
        __init__.py
        Bar.py

然后我会在 Foo.py 中这样做:

from .dirBar import Bar

如果我希望命名空间看起来像 Bar.whatever,或者

from . import dirBar

如果我想要命名空间 dirBar.Bar。whatever。 如果 dirBar 包下有更多模块,则第二种情况很有用。

For this case to import Bar.py into Foo.py, first I'd turn these folders into Python packages like so:

dirFoo\
    __init__.py
    Foo.py
    dirBar\
        __init__.py
        Bar.py

Then I would do it like this in Foo.py:

from .dirBar import Bar

If I wanted the namespacing to look like Bar.whatever, or

from . import dirBar

If I wanted the namespacing dirBar.Bar.whatever. This second case is useful if you have more modules under the dirBar package.

堇色安年 2024-07-15 20:39:44

对于 Linux 用户来说,快速而肮脏的方法

如果您只是在修修补补并且不关心部署问题,您可以使用符号链接(假设您的文件系统支持它)使模块或包在以下文件夹中直接可见请求模块。

ln -s (path)/module_name.py

ln -s (path)/package_name

注意:“模块”是任何具有 .py 扩展名的文件,“包”是包含文件 __init__.py (可以是空文件)的任何文件夹。 从使用的角度来看,模块和包是相同的 - 都根据 import 命令的请求公开其包含的“定义和语句”。

请参阅:http://docs.python.org/2/tutorial/modules.html

The quick-and-dirty way for Linux users

If you are just tinkering around and don't care about deployment issues, you can use a symbolic link (assuming your filesystem supports it) to make the module or package directly visible in the folder of the requesting module.

ln -s (path)/module_name.py

or

ln -s (path)/package_name

Note: A "module" is any file with a .py extension and a "package" is any folder that contains the file __init__.py (which can be an empty file). From a usage standpoint, modules and packages are identical -- both expose their contained "definitions and statements" as requested via the import command.

See: http://docs.python.org/2/tutorial/modules.html

半葬歌 2024-07-15 20:39:44

添加 __init__.py 文件:

dirFoo\
    Foo.py
    dirBar\
        __init__.py
        Bar.py

然后将此代码添加到 Foo.py 的开头:

import sys
sys.path.append('dirBar')
import Bar

Add an __init__.py file:

dirFoo\
    Foo.py
    dirBar\
        __init__.py
        Bar.py

Then add this code to the start of Foo.py:

import sys
sys.path.append('dirBar')
import Bar
抚你发端 2024-07-15 20:39:44

相对 sys.path 示例:

# /lib/my_module.py
# /src/test.py


if __name__ == '__main__' and __package__ is None:
    sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '../lib')))
import my_module

基于这个答案。

Relative sys.path example:

# /lib/my_module.py
# /src/test.py


if __name__ == '__main__' and __package__ is None:
    sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '../lib')))
import my_module

Based on this answer.

牛↙奶布丁 2024-07-15 20:39:44

另一种解决方案是安装 py-require 包,然后在 Foo.py

import require
Bar = require('./dirBar/Bar')

Another solution would be to install the py-require package and then use the following in Foo.py

import require
Bar = require('./dirBar/Bar')
逆光飞翔i 2024-07-15 20:39:44

好吧,正如您所提到的,通常您希望访问包含相对于主脚本运行位置的模块的文件夹,因此您只需导入它们即可。

解决方案:

我的脚本位于 D:/Books/MyBooks.py 和一些模块(如 oldies.py)中。 我需要从子目录 D:/Books/includes 导入:

import sys,site
site.addsitedir(sys.path[0] + '\\includes')
print (sys.path)  # Just verify it is there
import oldies

print('done') 放入 oldies.py 中,以便验证一切都很顺利。 这种方式总是有效,因为根据程序启动时初始化的 Python 定义 sys.path,此列表的第一项 path[0] 是包含脚本的目录用于调用 Python 解释器。

如果脚本目录不可用(例如,如果交互调用解释器或从标准输入读取脚本),则 path[0] 为空字符串,它指示 Python 在目录中搜索模块。首先是当前目录。 请注意,脚本目录被插入到由于 PYTHONPATH 而插入的条目之前。

Well, as you mention, usually you want to have access to a folder with your modules relative to where your main script is run, so you just import them.

Solution:

I have the script in D:/Books/MyBooks.py and some modules (like oldies.py). I need to import from subdirectory D:/Books/includes:

import sys,site
site.addsitedir(sys.path[0] + '\\includes')
print (sys.path)  # Just verify it is there
import oldies

Place a print('done') in oldies.py, so you verify everything is going OK. This way always works because by the Python definition sys.path as initialized upon program startup, the first item of this list, path[0], is the directory containing the script that was used to invoke the Python interpreter.

If the script directory is not available (e.g. if the interpreter is invoked interactively or if the script is read from standard input), path[0] is the empty string, which directs Python to search modules in the current directory first. Notice that the script directory is inserted before the entries inserted as a result of PYTHONPATH.

波浪屿的海角声 2024-07-15 20:39:44

只需使用: from Desktop.filename import some

示例:

假定目录中的文件名为 test.py
Users/user/Desktop ,并将导入所有内容。

代码:

from Desktop.test import *

但请确保在该目录中创建一个名为“__init__.py”的空文件

Simply you can use: from Desktop.filename import something

Example:

given that the file is name test.py in directory
Users/user/Desktop , and will import everthing.

the code:

from Desktop.test import *

But make sure you make an empty file called "__init__.py" in that directory

三寸金莲 2024-07-15 20:39:44

这是使用相对路径从上一级导入文件的方法。

基本上,只需将工作目录向上移动一个级别(或任何相对位置),将其添加到您的路径中,然后将工作目录移回其开始位置。

#to import from one level above:
cwd = os.getcwd()
os.chdir("..")
below_path =  os.getcwd()
sys.path.append(below_path)
os.chdir(cwd)

Here's a way to import a file from one level above, using the relative path.

Basically, just move the working directory up a level (or any relative location), add that to your path, then move the working directory back where it started.

#to import from one level above:
cwd = os.getcwd()
os.chdir("..")
below_path =  os.getcwd()
sys.path.append(below_path)
os.chdir(cwd)
沒落の蓅哖 2024-07-15 20:39:44

我对python没有什么经验,所以如果我的话有什么错误,请告诉我。 如果您的文件层次结构如下排列:

project\
    module_1.py 
    module_2.py

module_1.py 定义了一个名为 func_1() 的函数,module_2.py

from module_1 import func_1

def func_2():
    func_1()

if __name__ == '__main__':
    func_2()

并且您运行 python module_2.py 在 cmd 中,它将运行 func_1() 定义的内容。 这通常是我们导入相同层次结构文件的方式。 但是当你在module_2.py中编写from .module_1 import func_1时,Python解释器会说No module named '__main__.module_1'; '__main__' 不是一个包。 因此,为了解决这个问题,我们只需保留刚刚所做的更改,并将两个模块移动到一个包中,然后将第三个模块作为调用者来运行 module_2.py

project\
    package_1\
        module_1.py
        module_2.py
    main.py

ma​​in.py

from package_1.module_2 import func_2

def func_3():
    func_2()

if __name__ == '__main__':
    func_3()

但是我们在 module_2.py 中的 module_1 之前添加 . 的原因是,如果我们不这样做不要这样做并运行 main.py,Python 解释器会说 No module named 'module_1',这有点棘手,module_1.py就在 module_2.py 旁边。 现在,我让 module_1.py 中的 func_1() 执行一些操作:

def func_1():
    print(__name__)

__name__ 记录谁调用了 func_1。 现在我们将 . 保留在 module_1 之前,运行 main.py,它会打印 package_1.module_1,而不是 <代码> module_1 。 它表明调用 func_1() 的人与 main.py 处于同一层次结构,. 暗示 module_1< /code> 与 module_2.py 本身处于同一层次结构。 因此,如果没有点,main.py 将识别与其自身处于同一层次结构的 module_1,它可以识别 package_1,但不能识别它“下面”是什么。

现在让我们把它变得复杂一点。 您有一个 config.ini,并且模块定义了一个函数,可以在与“main.py”相同的层次结构中读取它。

project\
    package_1\
        module_1.py
        module_2.py
    config.py
    config.ini
    main.py

由于某些不可避免的原因,您必须使用 module_2.py 来调用它,因此它必须从上层导入。module_2.py

 import ..config
 pass

两个点表示从上层导入(三个点访问上比上,依此类推)。 现在我们运行main.py,解释器会说:ValueError:尝试相对导入超出顶级包。 这里的“顶级包”是main.py。 只是因为 config.py 位于 main.py 旁边,它们处于同一层次结构,config.py 不在“下”main.py,或者它不是由 main.py“引导”,因此它超出了 main.py。 要解决这个问题,最简单的方法是:

project\
    package_1\
        module_1.py
        module_2.py
    config.py
    config.ini
main.py

我认为这符合安排项目文件层次结构的原则,您应该将不同功能的模块安排在不同的文件夹中,并且只在外面留下一个顶级调用者,然后您可以导入你要。

I'm not experienced about python, so if there is any wrong in my words, just tell me. If your file hierarchy arranged like this:

project\
    module_1.py 
    module_2.py

module_1.py defines a function called func_1(), module_2.py:

from module_1 import func_1

def func_2():
    func_1()

if __name__ == '__main__':
    func_2()

and you run python module_2.py in cmd, it will do run what func_1() defines. That's usually how we import same hierarchy files. But when you write from .module_1 import func_1 in module_2.py, python interpreter will say No module named '__main__.module_1'; '__main__' is not a package. So to fix this, we just keep the change we just make, and move both of the module to a package, and make a third module as a caller to run module_2.py.

project\
    package_1\
        module_1.py
        module_2.py
    main.py

main.py:

from package_1.module_2 import func_2

def func_3():
    func_2()

if __name__ == '__main__':
    func_3()

But the reason we add a . before module_1 in module_2.py is that if we don't do that and run main.py, python interpreter will say No module named 'module_1', that's a little tricky, module_1.py is right beside module_2.py. Now I let func_1() in module_1.py do something:

def func_1():
    print(__name__)

that __name__ records who calls func_1. Now we keep the . before module_1 , run main.py, it will print package_1.module_1, not module_1. It indicates that the one who calls func_1() is at the same hierarchy as main.py, the . imply that module_1 is at the same hierarchy as module_2.py itself. So if there isn't a dot, main.py will recognize module_1 at the same hierarchy as itself, it can recognize package_1, but not what "under" it.

Now let's make it a bit complicated. You have a config.ini and a module defines a function to read it at the same hierarchy as 'main.py'.

project\
    package_1\
        module_1.py
        module_2.py
    config.py
    config.ini
    main.py

And for some unavoidable reason, you have to call it with module_2.py, so it has to import from upper hierarchy.module_2.py:

 import ..config
 pass

Two dots means import from upper hierarchy (three dots access upper than upper,and so on). Now we run main.py, the interpreter will say:ValueError:attempted relative import beyond top-level package. The "top-level package" at here is main.py. Just because config.py is beside main.py, they are at same hierarchy, config.py isn't "under" main.py, or it isn't "leaded" by main.py, so it is beyond main.py. To fix this, the simplest way is:

project\
    package_1\
        module_1.py
        module_2.py
    config.py
    config.ini
main.py

I think that is coincide with the principle of arrange project file hierarchy, you should arrange modules with different function in different folders, and just leave a top caller in the outside, and you can import how ever you want.

锦上情书 2024-07-15 20:39:44

这也有效,并且比使用 sys 模块的任何内容都简单得多:

with open("C:/yourpath/foobar.py") as f:
    eval(f.read())

This also works, and is much simpler than anything with the sys module:

with open("C:/yourpath/foobar.py") as f:
    eval(f.read())
挽你眉间 2024-07-15 20:39:44

你可以说我过于谨慎,但我喜欢让我的文件更加便携,因为假设文件在每台计算机上总是位于同一位置是不安全的。 就我个人而言,我让代码首先查找文件路径。 我使用 Linux,所以我的看起来像这样:

import os, sys
from subprocess import Popen, PIPE
try:
    path = Popen("find / -name 'file' -type f", shell=True, stdout=PIPE).stdout.read().splitlines()[0]
    if not sys.path.__contains__(path):
        sys.path.append(path)
except IndexError:
    raise RuntimeError("You must have FILE to run this program!")

当然,除非你打算将它们打包在一起。 但如果是这种情况,您实际上并不需要两个单独的文件。

Call me overly cautious, but I like to make mine more portable because it's unsafe to assume that files will always be in the same place on every computer. Personally I have the code look up the file path first. I use Linux so mine would look like this:

import os, sys
from subprocess import Popen, PIPE
try:
    path = Popen("find / -name 'file' -type f", shell=True, stdout=PIPE).stdout.read().splitlines()[0]
    if not sys.path.__contains__(path):
        sys.path.append(path)
except IndexError:
    raise RuntimeError("You must have FILE to run this program!")

That is of course unless you plan to package these together. But if that's the case you don't really need two separate files anyway.

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