[英]Importing classes from another directory - Python
Current Location: ProjectName/src 当前位置:ProjectName / src
Classes Location: ProjectName/Factory Modules/Factory Classes 类位置:ProjectName / Factory Modules / Factory Classes
Try 1: 试试1:
from FactoryClass1 import FactoryClass1
Try 2: 试试2:
import sys
sys.path.append(path_to_classes_folder)
from FactoryClass1 import FactoryClass1
However I keep getting 'ImportError: No module named PointSet'. 但是我继续得到'ImportError:没有名为PointSet的模块'。
How should the import statement be written in order to be able on using the functions in the classes? 如何编写import语句以便能够使用类中的函数?
You may try something like: 您可以尝试以下方法:
import os.path, sys
# Add current dir to search path.
sys.path.insert(0, "dir_or_path")
# Add module from the current directory.
sys.path.insert(0, os.path.dirname(os.path.abspath(os.path.realpath(__file__))) + "/dir")
Which will add your directory to Python search path. 这会将您的目录添加到Python搜索路径。 Then you may import as usual. 然后你可以照常导入。
To see which paths has been added, check by: 要查看已添加的路径,请检查:
import sys
from pprint import pprint
pprint(sys.path)
If still doesn't work, make sure that your module is the valid Python module (should contain __init__.py
file inside the directory). 如果仍然不起作用,请确保您的模块是有效的Python模块(应该在目录中包含__init__.py
文件)。 If it is not, create empty one. 如果不是,请创建空的。
Alternatively to just load the classes inline, in Python 3 you may use exec()
, for example: 或者只是加载内联类,在Python 3中你可以使用exec()
,例如:
exec(open(filename).read())
In Python 2: execfile()
. 在Python 2中: execfile()
。
See: Alternative to execfile in Python 3.2+? 请参阅: Python 3.2+中execfile的替代方案?
If you run your script from the command-line, you can also specify your Python path by defining PYTHONPATH
variable, so Python can lookup for modules in the provided directories, eg 如果从命令行运行脚本,还可以通过定义PYTHONPATH
变量来指定Python路径,这样Python就可以在提供的目录中查找模块,例如
PYTHONPATH=$PWD/FooDir ./foo.py
For alternative solutions check: How to import other Python files? 对于替代解决方案,请检查: 如何导入其他Python文件?
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