The list of standard YAML tags and corresponding Python types.
{{{
!!null ''                   # None
!!bool 'yes'                # bool
!!int '3...'                # int or long
!!float '3.14...'           # float
!!binary '...base64...'     # str
!!timestamp 'YYYY-...'      # datetime.datetime
!!omap [ ... ]              # list of pairs (note that key uniqueness is not checked)
!!pairs [ ... ]             # list of pairs
!!set { ... }               # set
!!str '...'                 # str or unicode (ASCII scalars are converted to str)
!!seq [ ... ]               # list
!!map { ... }               # dict
}}}

The list of Python-specific YAML tags and corresponding Python types.
Tags representing complex objects such as class instances are in a separate list.
Note that in most cases there are two tags that represent the same Python type
(e.g. {{{!!map}}} and {{{!!python/dict}}}). In such cases, standard YAML tags
are prioritized, and Python-specific form is added for completeness.
{{{
!!python/none ''            # None
!!python/bool 'True'        # bool
!!python/str '...'          # str
!!python/unicode '...'      # unicode
!!python/int '123...'       # int
!!python/long '123...'      # long
!!python/float '3.14...'    # float
!!python/complex '1+1j'     # complex
!!python/list [ ... ]       # list
!!python/tuple [ ... ]      # tuple
!!python/dict { ... }       # dict
}}}

To represent class instances and other complex objects, the following tags are used.
{{{
!!python/name:module.name           # module.name (types, classes, and functions)
!!python/module:module              # module
!!python/object:module.name         # module.name instance with the specified attributes
    { ...attributes... }
!!python/object/apply:module.name   # reduce protocol
    args: [ ... arguments ... ]
    kwds: { ... keywords ... }
    state: ... state ...
    listitems: [ ... listitems ... ]
    dictitems: { ... dictitems ... }
!!python/object/apply:module.name   # short form of !!python/object/apply
    [ ... arguments ... ]
!!python/object/new:module.name     # reduce protocol (__new__)
    args: [ ... arguments ... ]
    kwds: { ... keywords ... }
    state: ... state ...
    listitems: [ ... listitems ... ]
    dictitems: { ... dictitems ... }
!!python/object/new:module.name     # short form of !!python/object/new
    [ ... arguments ... ]
}}}