init

问题 The Ingredient model of my Django project has an IntegerField which declares if this ingredient stock is managed by weight, units, or litters. Although the database has its integer value I have to display its name. And instead of looping over every ingredient and setting its value, I thought it was better to overwrite the __init__ method of the Python class, but I don't get how. models.py: class Ingredient(models.Model): def __init__(self): super(Ingredient, self).__init__() if self.cost_by =

问题 This question already has answers here : What is __init__.py for? (12 answers) Closed 5 years ago . I understand that python needs the __ init __.py file in order to recognize the directory as a python package, that way we can import sub modules into our program.I can see the similarity to classes and how init can be used to execute necessary code off the bat. However, in the python docs, this line confuses me, This is done to prevent directories with a common name, such as string, from

问题 I want to create a NUGET package that adds several files to a certain solution folder. Specifically, the package must, on installation, do the following: Create a temp folder in the target project. Copy all the files matching an extension (say *.txt) to the temp folder. Move the files to Solution root. Create a Solution folder named "Solution Items". Add all the files just moved to that solution folder. Remove the temp folder from both solution and disk. I use the package.nuspec file to

问题 I have the following piece of code: class MyStruct(ctypes.Structure): _fields_= [('id', ctypes.uint), ('perm', ctypes.uint)] When the class is defined, i'm able to copy data from buffer directly on my fields. Eg: ms = MyStruct.from_buffer_copy("\xAA\xAA\xAA\xAA\x11\x11\x11\x11") print ms.id, ms.perm Everythings works fine, here id will be 0xAAAAAAAA and perm equals to 0x11111111 . Now, i tried to do the same thing during the instantiation, with the following code: class MyStruct(ctypes

问题 I have the following piece of code: class MyStruct(ctypes.Structure): _fields_= [('id', ctypes.uint), ('perm', ctypes.uint)] When the class is defined, i'm able to copy data from buffer directly on my fields. Eg: ms = MyStruct.from_buffer_copy("\xAA\xAA\xAA\xAA\x11\x11\x11\x11") print ms.id, ms.perm Everythings works fine, here id will be 0xAAAAAAAA and perm equals to 0x11111111 . Now, i tried to do the same thing during the instantiation, with the following code: class MyStruct(ctypes

问题 I am attempting to start a jar from a systemd service, in linux. The jar that I am executing assumes that within the current directory, there is an xml file. I am passing the name of that file, with the -config argument. The sample service I have created is below: [Unit] Description=my service After=network.target [Service] Type=simple Environment="xml_file_name=sample.xml" ExecStart=/usr/bin/java -jar /path/to/jar/myapp.jar -config ${xml_file_name} The service file above is placed in the

问题 I am attempting to start a jar from a systemd service, in linux. The jar that I am executing assumes that within the current directory, there is an xml file. I am passing the name of that file, with the -config argument. The sample service I have created is below: [Unit] Description=my service After=network.target [Service] Type=simple Environment="xml_file_name=sample.xml" ExecStart=/usr/bin/java -jar /path/to/jar/myapp.jar -config ${xml_file_name} The service file above is placed in the

问题 So I was just trying to do same basic Classes stuff in Python.org's Python 3.7.0 IDLE (Shell), and when I tried to run this code: class Giraffes: def _init_(self, spots): self.giraffe_spots = spots gerald = Giraffes(100) It gave me this error: Traceback (most recent call last): File "<pyshell#69>", line 1, in <module> gerald = Giraffes(100) TypeError: Giraffes() takes no arguments Doesn't the init function in class Giraffes make Gerald take parameter self ? I'm just getting started with

问题 I found out about the /docker-entrypoint-initdb.d directory from this answer, and also read the "Initializing a fresh instance" section of the "How to use this image" MySQL documentation. But when I run docker-compose up in the directory containing the docker-compose.yml file below, my database isn't initialized. services: # Use root/root as MySQL user/password credentials db: image: mysql restart: always environment: MYSQL_ROOT_PASSWORD: root MYSQL_USER: root MYSQL_PASSWORD: root MYSQL

问题 I'm new in Python and I'm having the following error with this simple example: This is my project structure: python_project . ├── lib │ ├── __init__.py │ └── my_custom_lib.py └── src ├── __init__.py └── main.py And this is the error when I execute the src/main.py file: ☁ python_project python src/main.py Traceback (most recent call last): File "src/main.py", line 3, in <module> from lib import my_custom_lib ImportError: No module named lib If I move the main.py file to the root and then I