[英]Distutils - Where Am I going wrong?
I wanted to learn how to create python packages, so I visited http://docs.python.org/distutils/index.html . 我想学习如何创建python包,因此访问了http://docs.python.org/distutils/index.html 。
For this exercise I'm using Python 2.6.2 on Windows XP. 在本练习中,我将在Windows XP上使用Python 2.6.2。
I followed along with the simple example and created a small test project: 我遵循了简单的示例,并创建了一个小测试项目:
person/
setup.py
person/
__init__.py
person.py
My person.py file is simple: 我的person.py文件很简单:
class Person(object):
def __init__(self, name="", age=0):
self.name = name
self.age = age
def sound_off(self):
print "%s %d" % (self.name, self.age)
And my setup.py file is: 我的setup.py文件是:
from distutils.core import setup
setup(name='person',
version='0.1',
packages=['person'],
)
I ran python setup.py sdist and it created MANIFEST, dist/ and build/. 我运行python setup.py sdist,它创建了MANIFEST,dist /和build /。 Next I ran python setup.py install and it installed it to my site packages directory.
接下来,我运行python setup.py install并将其安装到我的站点软件包目录中。
I run the python console and can import the person module, but I cannot import the Person class. 我运行python控制台,可以导入person模块,但是不能导入Person类。
>>>import person
>>>from person import Person
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: cannot import name Person
I checked the files added to site-packages and checked the sys.path in the console, they seem ok. 我检查了添加到站点程序包中的文件,并在控制台中检查了sys.path,它们看起来还不错。 Why can't I import the Person class.
为什么不能导入Person类。 Where did I go wrong?
我哪里做错了?
person/
__init__.py
person.py
You've got a package called person
, and a module inside it called person.person
. 您有一个名为
person
的程序包,并且其中有一个名为person.person
的模块。 You defined the class in that module, so to access it you'd have to say: 您在该模块中定义了该类,因此要访问它,您必须说:
import person.person
p= person.person.Person('Tim', 42)
If you want to put members directly inside the package person
, you'd put them in the __init__.py
file. 如果要将成员直接放在打包
person
内部,则可以将它们放在__init__.py
文件中。
Your question isn't really about distutils packages, but about Python packages -- a related but different thing with the same name. 您的问题不是关于distutils软件包,而是关于Python软件包-一个相关但不同的名称。 Packages in Python are a separate kind of module, that are directories with an
__init__.py
file. Python中的软件包是一种单独的模块,是带有
__init__.py
文件的目录。 You created a person
package with a person
module with a Person
class. 您使用带有
Person
类的person
模块创建了一个person
包。 import person
gives you the package. import person
给您包裹。 If you want the person
module inside the person
package, you need import person.person
. 如果你想在
person
的内部模块person
包,需要import person.person
。 And if you want the Person
class inside the person
module inside the person
package, you need from person.person import Person
. 如果要在
person
包内的person
模块中包含Person
类,则需要from person.person import Person
。
These things get a lot more obvious when you don't give different things the same name, and also when you don't put classes in separate modules for their own sake. 当您不给不同的事物使用相同的名称时,以及当您不出于自己的考虑将类放在单独的模块中时,这些事情将变得更加明显。 Also see Should I create each class in its own .py file?
另请参见我应该在自己的.py文件中创建每个类吗?
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