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implicit keys need to be on a single line
Implicit keys in YAML can be either on a single line or multiple lines. The choice of whether to use a single line or multiple lines for implicit keys depends on personal preference and readability.
For example, the following YAML document uses implicit keys on a single line:
makefilename: John age: 30
And the same document with the implicit keys on multiple lines:
makefilename: John age: 30
Both documents are valid YAML and the choice of which one to use depends on the preference of the writer and the specific context in which the YAML is being used.
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Implicit keys need to be on a single line
In YAML, implicit keys can be written on a single line or on multiple lines. However, if you choose to write an implicit key on multiple lines, you need to be careful with the indentation and line breaks.
For example, if you have a mapping with an implicit key “foo” and a value “bar”, you could write it on a single line like this:
makefilefoo: bar
Or you could write it on multiple lines like this:
makefilefoo: bar
In this case, the value “bar” is indented under the key “foo” and there is a line break after the colon.
However, if you don’t include the line break, like this:
makefilefoo: bar
then “bar” would be interpreted as a string value, rather than a separate key-value pair. So, it’s important to be consistent with your formatting and make sure that your YAML code is easy to read and understand.
Implicit map keys need to be followed by map values
In a map data structure, every key must be followed by a corresponding value. It is not possible to have an implicit key without an associated value. In other words, every key must have a value assigned to it, whether it is done explicitly or implicitly.
For example, consider the following map in Python:
cssmy_map = {'a': 1, 'b': 2, 'c'}
This code will result in a SyntaxError
because the key 'c'
does not have a corresponding value. To fix this, we must provide a value for the key 'c'
:
cssmy_map = {'a': 1, 'b': 2, 'c': 3}
Alternatively, if we don’t have a specific value for the key 'c'
, we can assign it a default value, such as None
:
pythonmy_map = {'a': 1, 'b': 2, 'c': None}
In summary, every key in a map must have a corresponding value, whether it is explicitly assigned or given a default value.
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