poyo
A lightweight YAML Parser for Python.
poyo does not allow deserialization of arbitrary Python objects. Supported
types are str, bool, int, float, NoneType as well as dict and
list values.
Installation
poyo is available on PyPI for Python versions 2.7 and newer and can be installed with pip:
pip install poyo
This package does not have any additional requirements.
Usage
poyo comes with a parse_string() function, to load utf-8 encoded string
data into a Python dict.
import codecs
import logging
from poyo import parse_string, PoyoException
logging.basicConfig(level=logging.DEBUG)
with codecs.open("tests/foobar.yml", encoding="utf-8") as ymlfile:
ymlstring = ymlfile.read()
try:
config = parse_string(ymlstring)
except PoyoException as exc:
logging.error(exc)
else:
logging.debug(config)Example
Input YAML string
---
default_context: # foobar
greeting: ใใใซใกใฏ
email: "[email protected]"
docs: true
gui: FALSE
123: 456.789
# comment
# allthethings
'some:int': 1000000
foo: "hallo #welt" #Inline comment :)
longtext: >
This is a multiline string.
It can contain all manners of characters.
Single line breaks are ignored,
but blank linkes cause line breaks.
trueish: Falseeeeeee
blog : raphael.codes
relative-root: / # web app root path (default: '')
lektor: 0.0.0.0:5000 # local build
doc_tools:
# docs or didn't happen
- mkdocs
- 'sphinx'
- null
# ไปๆฅใฏ
zZz: True
NullValue: Null
# Block
# Comment
Hello World:
# See you at EuroPython
null: This is madness # yo
gh: https://github.com/{0}.git
"Yay #python": Cool!Output Python dict
{
u"default_context": {
u"greeting": u"ใใใซใกใฏ",
u"email": u"[email protected]",
u"docs": True,
u"gui": False,
u"lektor": "0.0.0.0:5000",
u"relative-root": "/",
123: 456.789,
u"some:int": 1000000,
u"foo": u"hallo #welt",
u"longtext": (
u"This is a multiline string. It can contain all "
u"manners of characters.\nSingle line breaks are "
u"ignored, but blank linkes cause line breaks.\n"
),
u"trueish": u"Falseeeeeee",
u"blog": u"raphael.codes",
u"doc_tools": [u"mkdocs", u"sphinx", None],
},
u"zZz": True,
u"NullValue": None,
u"Hello World": {
None: u"This is madness",
u"gh": u"https://github.com/{0}.git",
},
u"Yay #python": u"Cool!",
}Logging
poyo follows the recommendations for logging in a library, which
means it does not configure logging itself. Its root logger is named poyo
and the names of all its children loggers track the package/module hierarchy.
poyo logs to a NullHandler and solely on DEBUG level.
If your application configures logging and allows debug messages to be shown,
you will see logging when using poyo. The log messages indicate which parser
method is used for a given string as the parser deseralizes the config. You
can remove all logging from poyo in your application by setting the log level
of the poyo logger to a value higher than DEBUG.
Disable Logging
import logging
logging.getLogger("poyo").setLevel(logging.WARNING)Example Debug Logging Config
import logging
from poyo import parse_string
logging.basicConfig(level=logging.DEBUG)
CONFIG = """
---
default_context: # foobar
greeting: ใใใซใกใฏ
gui: FALSE
doc_tools:
# docs or didn't happen
- mkdocs
- 'sphinx'
123: 456.789
"""
parse_string(CONFIG)Example Debug Logging Messages
DEBUG:poyo.parser:parse_blankline <- \n
DEBUG:poyo.parser:parse_blankline -> IGNORED
DEBUG:poyo.parser:parse_dashes <- ---\n
DEBUG:poyo.parser:parse_dashes -> IGNORED
DEBUG:poyo.parser:parse_section <- default_context: # foobar\n
DEBUG:poyo.parser:parse_str <- default_context
DEBUG:poyo.parser:parse_str -> default_context
DEBUG:poyo.parser:parse_section -> <Section name: default_context>
DEBUG:poyo.parser:parse_simple <- greeting: \u3053\u3093\u306b\u3061\u306f\n
DEBUG:poyo.parser:parse_str <- greeting
DEBUG:poyo.parser:parse_str -> greeting
DEBUG:poyo.parser:parse_str <- \u3053\u3093\u306b\u3061\u306f
DEBUG:poyo.parser:parse_str -> \u3053\u3093\u306b\u3061\u306f
DEBUG:poyo.parser:parse_simple -> <Simple name: greeting, value: \u3053\u3093\u306b\u3061\u306f>
DEBUG:poyo.parser:parse_simple <- gui: FALSE\n
DEBUG:poyo.parser:parse_str <- gui
DEBUG:poyo.parser:parse_str -> gui
DEBUG:poyo.parser:parse_false <- FALSE
DEBUG:poyo.parser:parse_false -> False
DEBUG:poyo.parser:parse_simple -> <Simple name: gui, value: False>
DEBUG:poyo.parser:parse_list <- doc_tools:\n # docs or didn't happen\n - mkdocs\n - 'sphinx'\n
DEBUG:poyo.parser:parse_str <- mkdocs
DEBUG:poyo.parser:parse_str -> mkdocs
DEBUG:poyo.parser:parse_str <- 'sphinx'
DEBUG:poyo.parser:parse_str -> sphinx
DEBUG:poyo.parser:parse_str <- doc_tools
DEBUG:poyo.parser:parse_str -> doc_tools
DEBUG:poyo.parser:parse_list -> <Simple name: doc_tools, value: ['mkdocs', 'sphinx']>
DEBUG:poyo.parser:parse_simple <- 123: 456.789\n
DEBUG:poyo.parser:parse_int <- 123
DEBUG:poyo.parser:parse_int -> 123
DEBUG:poyo.parser:parse_float <- 456.789
DEBUG:poyo.parser:parse_float -> 456.789
DEBUG:poyo.parser:parse_simple -> <Simple name: 123, value: 456.789>
DEBUG:poyo.parser:parse_simple <- docs: true\n
DEBUG:poyo.parser:parse_str <- docs
DEBUG:poyo.parser:parse_str -> docs
DEBUG:poyo.parser:parse_true <- true
DEBUG:poyo.parser:parse_true -> True
DEBUG:poyo.parser:parse_simple -> <Simple name: docs, value: True>
About this project
We created this project to work around installation issues with a cookiecutter version that depended on existing YAML parsers for Python. For more information please check out this GitHub issue.
Community
Would you like to contribute to poyo? You're awesome!
Please check out the good first issue label for tasks, that are good candidates for your first contribution to poyo. Your contributions are greatly appreciated! Every little bit helps and credit will always be given.
Everyone interacting in the poyo project's codebases, issue trackers, chat rooms, and mailing lists is expected to follow the PyPI Code of Conduct.
Join the poyo community!
License
Distributed under the terms of the MIT license, poyo is free and open source software.