Yaml nested list

YAML is a markup language with many powerful features. However, Salt uses a small subset of YAML that maps over very commonly used data structures, like lists and dictionaries.

YAML uses a fixed indentation scheme to represent relationships between data layers. Salt requires that the indentation for each level consists of exactly two spaces. Do not use tabs. Python dictionaries are, of course, simply key-value pairs. Users from other languages may recognize this data type as hashes or associative arrays.

Dictionary keys are represented in YAML as strings terminated by a trailing colon. Values are represented by either a string following the colon, separated by a space:. The above syntax is valid YAML but is uncommon in SLS files because most often, the value for a key is not singular but instead is a list of values. To represent lists of items, a single dash followed by a space is used. Multiple items are a part of the same list as a function of their having the same level of indentation.

Jinja statements and expressions are allowed by default in SLS files. See Understanding Jinja. You are viewing docs for the latest stable release, Switch to docs for the previous stable release, Privacy Policy.

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Note The above syntax is valid YAML but is uncommon in SLS files because most often, the value for a key is not singular but instead is a list of values. Generated on April 09, at UTC.This page provides a basic overview of correct YAML syntax, which is how Ansible playbooks our configuration management language are expressed. Further, there are libraries available in most programming languages for working with YAML.

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You may also wish to read Working With Playbooks at the same time to see how this is used in practice. So, we need to know how to write lists and dictionaries in YAML. All YAML files regardless of their association with Ansible or not can optionally begin with and end with This is part of the YAML format and indicates the start and end of a document.

All members of a list are lines beginning at the same indentation level starting with a "- " a dash and a space :. A dictionary is represented in a simple key: value form the colon must be followed by a space :. More complicated data structures are possible, such as lists of dictionaries, dictionaries whose values are lists or a mix of both:.

In either case the indentation will be ignored. Examples are:. This really has nothing to do with Ansible, but will give you a feel for the format:. While you can put just about anything into an unquoted scalar, there are some exceptions. A colon followed by a space or newline ": " is an indicator for a mapping. A space followed by the pound sign " " starts a comment.

The difference between single quotes and double quotes is that in double quotes you can use escapes:. If your value starts with a quote the entire value must be quoted, not just part of it. Here are some additional examples of how to properly quote things:. You should also be aware of?

yaml nested list

Boolean conversion is helpful, but this can be a problem when you want a literal yes or other boolean values as a string. In these cases just use quotes:. YAML converts certain strings into floating-point values, such as the string 1. If you need to specify a version number in a requirements.

Ansible 2. All members of a list are lines beginning at the same indentation level starting with a "- " a dash and a space : A list of tasty fruits - Apple - Orange - Strawberry - MangoIt is commonly used for configuration files and in applications where data is being stored or transmitted. Custom data types are allowed, but YAML natively encodes scalars such as stringsintegersand floatslistsand associative arrays also known as maps, dictionaries or hashes.

These data types are based on the Perl programming language, though all commonly used high-level programming languages share very similar concepts.

The colon-centered syntax, used for expressing key-value pairsis inspired by electronic mail headers as defined in RFCand the document separator "" is borrowed from MIME RFC Escape sequences are reused from Cand whitespace wrapping for multi-line strings is inspired by HTML. Support for reading and writing YAML is available for many programming languages. The official recommended filename extension for YAML files has been. A cheat sheet and full specification are available at the official site.

YAML offers an "in-line" style for denoting associative arrays and lists.

yaml nested list

Here is a sample of the components. Strings do not require quotation marks. By default, the leading indentation of the first line and trailing whitespace is stripped, though other behavior can be explicitly specified.

Objects and lists are important components in yaml and can be mixed. The first example is a list of key-value objects, all people from the Smith family. The second lists them by gender; it is a key-value object containing two lists. Two features that distinguish YAML from the capabilities of other data-serialization languages are structures [17] and data typing.

YAML structures enable storage of multiple documents within a single file, usage of references for repeated nodes, and usage of arbitrary nodes as keys. References to the anchor work for all data types see the ship-to reference in the example below. Below is an example of a queue in an instrument sequencer in which two steps are reused repeatedly without being fully described each time.

Data types can be divided into three categories: core, defined, and user-defined.

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Core are ones expected to exist in any parser e. Many more advanced data types, such as binary data, are defined in the YAML specification but not supported in all implementations. Finally YAML defines a way to extend the data type definitions locally to accommodate user-defined classes, structures or primitives e. YAML autodetects the datatype of the entity, but sometimes one wants to cast the datatype explicitly. The most common situation is where a single-word string that looks like a number, boolean or tag requires disambiguation by surrounding it with quotes or using an explicit datatype tag.

Not every implementation of YAML has every specification-defined data type. These built-in types use a double-exclamation sigil prefix!! Particularly interesting ones not shown here are sets, ordered maps, timestamps, and hexadecimal.YAML is to configuration what markdown is to markup.

YAML is built from the ground up to be simple to use. At its core, a YAML file is used to describe data. Basically, the data you enter in a YAML file is used in conjunction with a library to create the pages you see within Grav.

Nested lists in YAML – YAML Examples

There are some rules that YAML has in place to avoid issues related to ambiguity in relation to various languages and editing programs. While it can be used with most programming languages, it works best with languages that are built around these data structure types. Scalars are a pretty basic concept. They are the strings and numbers that make up the data on the page.

A scalar could be a boolean property, like Yesinteger number such as 5or a string of text, like a sentence or the title of your website. Scalars are often called variables in programming. If you were making a list of types of animals, they would be the names given to those animals.

Most scalars are unquoted, but if you are typing a string that uses punctuation and other elements that can be confused with YAML syntax dashes, colons, etc. Here is a simple sequence you might find in Grav. It is a basic list with each item in the list placed in its own line with an opening dash.

This sequence places each item in the list at the same level. If you want to create a nested sequence with items and sub-items, you can do so by placing a single space before each dash in the sub-items. You can see an example of this below. Mapping gives you the ability to list keys with values. This is useful in cases where you are assigning a name or a property to a specific element.

YAML Syntax

This example maps the value of pets to the animal key. When used in conjunction with a sequence, you can see that you are starting to build a list of pets. In the following example, the dash used to label each item counts as indentation, making the line items the child and the mapping line pets the parent. For more information about YAML, including detailed documentation about how it works, check out the resources linked below.

Found errors? Think you can improve this documentation? Simply click the Edit link at the top of the page, and then the icon on Github to make your changes. Basics What is Grav? Migration Migrating from Drupal 7 to Grav Grav API YAML files should end in. YAML is case sensitive. YAML does not allow the use of tabs.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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This is almost correct, but after "" there should be a nested list, not just another list item. How can I fix this? Read this and this articles.

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They have a lot of examples. Learn more. Nested lists in yaml Ask Question. Asked 6 years, 11 months ago. Active 2 years ago. Viewed 47k times. Active Oldest Votes. Yohann Yohann 4, 2 2 gold badges 21 21 silver badges 31 31 bronze badges.

Hi, unfortunately that's inserted curly braces - I can't have curly braces. The output must specifically be what I've got in my question.

yaml nested list

I can't to that. See Example 2. Compact Nested Mapping of the yaml spec That doesn't help. I've updated my question to make it clearer what I'm trying to achieve. Arayan Singh Arayan Singh 1, 2 2 gold badges 7 7 silver badges 28 28 bronze badges. Sign up or log in Sign up using Google.Sometimes you want to repeat a task multiple times. In computer programming, this is called a loop. Repeated tasks can be written as standard loops over a simple list of strings.

You can define the list directly in the task:. You can pass a list directly to a parameter for some plugins. Most of the packaging modules, like yum — Manages packages with the yum package manager and apt — Manages apt-packageshave this capability.

When available, passing the list to a parameter is better than looping over the task. For example:. When combining Conditionals with a loop, the when: statement is processed separately for each item. See The When Statement for examples. To loop over a dict, use the dict2items Dict Filter :.

When you use register with a loop, the data structure placed in the variable will contain a results attribute that is a list of all responses from the module. This differs from the data structure returned when using register without a loop:. You can use Jinja2 expressions to iterate over complex lists.

For example, a loop can combine nested lists:. You can use the until keyword to retry a task until a certain condition is met. This task runs up to 5 times with a delay of 10 seconds between each attempt.

To see the results of individual retries, run the play with -vv. You must set the until parameter if you want a task to retry. If until is not defined, the value for the retries parameter is forced to 1.In 2017 Salvador Sobral won with record breaking 758 points with the song "Amar Pelos Dois"Did you know.

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