The pipe symbol at the end of a line in YAML signifies that any indented text that follows should be interpreted as a multi-line scalar value. See the YAML spec.
Specifically, the pipe indicates that (except for the indentation) the scalar value should be interpreted literally in such a way that preserves newlines. Conversely, the >
character indicates that multi-line “folded” scalar follows, meaning that newlines are converted to spaces. For example:
>>> import yaml
>>> yaml.load("""
... |
... This is a multi-line
... literal style scalar.
... """)
'This is a multi-line\nliteral style scalar.\n'
>>> yaml.load("""
... >
... This is a multi-line
... folded scalar; new lines are folded into
... spaces.
... """)
'This is a multi-line folded scalar; new lines are folded into spaces.\n'
The 6+
part is the indentation indicator (an explicit specification of how many spaces of indentation should be used) with the “chomping indicator” +
which controls how extra whitespace at the end of the scalar literal should be handled.
The error you’re getting is a tricky one: It’s because indentation should be relative to the current block-level element. So in this case it should be 2+
instead of 6+
because the last block-level element is the mapping final:
and the literal is indented 2 from it. Updated with correction from @bramvi.