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Ticket #166 (closed enhancement: wontfix)

Opened 4 years ago

Last modified 15 hours ago

PyYAML should use libyaml if libyaml available

Reported by: sgwong Owned by: xi
Priority: normal Component: pyyaml
Severity: normal Keywords:
Cc:

Description (last modified by xi) (diff)

Currently PyYAML only use python implementation although the libyaml available. The following simple changes on __init__.py should do: (I'm not sure whats the use of __with_libyaml__)

__version__ = '3.09'

try:
    from cyaml import *
    __with_libyaml__ = True
    Loader = CLoader
    Dumper = CDumper
except ImportError:
    __with_libyaml__ = False 

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comment:1 Changed 4 years ago by xi

  • Status changed from new to closed
  • Resolution set to wontfix
  • Description modified (diff)

You could use __with_libyaml__ to check whether libyaml bindings are available or not. For instance,

import yaml
if yaml.__with_libyaml__:
    data = yaml.load(input, Loader=yaml.CLoader)
else:
    data = yaml.load(input)

The pure-Python and libyaml-based emitters may emit valid, but slightly different representations of the same document, therefore, to make the output deterministic regardless of whether libyaml is available or not, PyYAML always uses pure-Python parser and emitter by default.

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