Table of Contents
- 1 How do you add comments in Python?
- 2 What is the syntax to add comments?
- 3 How do I add a comment to a line in Python?
- 4 What are comments give an example of multi-line comment?
- 5 What is the difference between full line comment and inline comment?
- 6 How do you comment out code?
- 7 How do you comment lines in Yaml?
- 8 How do you comment multiple lines in shell script?
- 9 How do I add a comment to a YML file?
- 10 How do you comment inside a JSON?
- 11 How do I comment in Dockerfile?
- 12 How do I comment multiple lines in Dockerfile?
- 13 What does from mean in Dockerfile?
- 14 Which language is used in Dockerfile?
- 15 What is difference between ADD and copy in Dockerfile?
- 16 What are Docker layers?
- 17 What is the difference between entrypoint and CMD in Docker?
- 18 Does CMD override entrypoint?
- 19 Does a Dockerfile need a CMD?
- 20 What are Docker commands?
- 21 What is Docker images command?
- 22 What does Docker CLI command do?
- 23 How do I run a docker image?
How do you add comments in Python?
Comments in Python begin with a hash mark ( # ) and whitespace character and continue to the end of the line. Because comments do not execute, when you run a program you will not see any indication of the comment there. Comments are in the source code for humans to read, not for computers to execute.
What is the syntax to add comments?
The single line comment is //. Everything from the // to the end of the line is a comment. To mark an entire region as a comment, use /* to start the comment and */ to end the comment.
How do I add a comment to a line in Python?
Single-line comments are created simply by beginning a line with the hash (#) character, and they are automatically terminated by the end of line. Comments that span multiple lines – used to explain things in more detail – are created by adding a delimiter (“””) on each end of the comment.
What are comments give an example of multi-line comment?
|Name||/* */ (multiline comment)|
|Examples||/* Draws two lines which divides the window into four quadrants. First draws a horizontal line and then the vertical line */ line(0, 50, 100, 50); line(50, 0, 50, 100);|
What is the difference between full line comment and inline comment?
What is the difference between full-line comment and inline comment ? Full line comments take a complete line while Inline comments share the line with a statement or expression.
How do you comment out code?
You can comment out one or more lines of code in any C/C++ editor view. The leading characters // are added to the beginning of each line when commenting one or more lines of code. You can also block comment multiple lines of code using the characters /* */ .
How do you comment lines in Yaml?
The shortcut key combination for commenting YAML blocks is Ctrl+Q.
How do you comment multiple lines in shell script?
Commenting Multiple Lines
- First, press ESC.
- Go to the line from which you want to start commenting.
- use the down arrow to select multiple lines that you want to comment.
- Now, press SHIFT + I to enable insert mode.
- Press # and it will add a comment to the first line.
How do I add a comment to a YML file?
In order to add comments to a YAML file, you simply have to use the # (hashtag symbol) at the start of the line. For example, below is an example of one commented line in a YAML file.
How do you comment inside a JSON?
JSON does not support comments. It was also never intended to be used for configuration files where comments would be needed. Hjson is a configuration file format for humans. Relaxed syntax, fewer mistakes, more comments.
How do I comment in Dockerfile?
Like programming languages, you can write comments in your Dockerfiles. Comments in Dockerfiles are denoted by using the hash or pound symbol # at the beginning of the line. You should note that it only supports one-line comments, hence to write multi-line comments, you’ll use the hash symbol on each line.
How do I comment multiple lines in Dockerfile?
Docker treats lines that begin with # as a comment, unless the line is a valid parser directive. A # marker anywhere else in a line is treated as an argument. Line continuation characters are not supported in comments. On the other hand you can achieve the requested result easily with any modern IDE / Text Editor.
What does from mean in Dockerfile?
Which language is used in Dockerfile?
Google Go (golang)
What is difference between ADD and copy in Dockerfile?
COPY and ADD are both Dockerfile instructions that serve similar purposes. They let you copy files from a specific location into a Docker image. COPY takes in a src and destination. A valid use case for ADD is when you want to extract a local tar file into a specific directory in your Docker image.
What are Docker layers?
What are the layers? Docker containers are building blocks for applications. Each container is an image with a readable/writeable layer on top of a bunch of read-only layers. These layers (also called intermediate images) are generated when the commands in the Dockerfile are executed during the Docker image build.
What is the difference between entrypoint and CMD in Docker?
CMD is an instruction that is best to use if you need a default command which users can easily override. If a Dockerfile has multiple CMDs, it only applies the instructions from the last one. On the other hand, ENTRYPOINT is preferred when you want to define a container with a specific executable.
Does CMD override entrypoint?
Entrypoint and CMD are instructions in the Dockerfile that define the process in a Docker image. You can use one or combine both depending on how you want to run your container. One difference is that unlike CMD , you cannot override the ENTRYPOINT command just by adding new command line parameters.
Does a Dockerfile need a CMD?
Dockerfile should specify at least one of CMD or ENTRYPOINT commands. ENTRYPOINT should be defined when using the container as an executable. CMD should be used as a way of defining default arguments for an ENTRYPOINT command or for executing an ad-hoc command in a container.
What are Docker commands?
Here’s a List of Docker Commands
- docker run – Runs a command in a new container.
- docker start – Starts one or more stopped containers.
- docker stop – Stops one or more running containers.
- docker build – Builds an image form a Docker file.
- docker pull – Pulls an image or a repository from a registry.
What is Docker images command?
Extended description. The default docker images will show all top level images, their repository and tags, and their size. Docker images have intermediate layers that increase reusability, decrease disk usage, and speed up docker build by allowing each step to be cached.
What does Docker CLI command do?
The docker run command first creates a writeable container layer over the specified image, and then starts it using the specified command. See docker ps -a to view a list of all containers. The docker run command can be used in combination with docker commit to change the command that a container runs.
How do I run a docker image?
To run an image inside of a container, we use the docker run command. The docker run command requires one parameter and that is the image name. Let’s start our image and make sure it is running correctly. Execute the following command in your terminal.