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Define const field and const class, customize it as You Like (Python)

Project Description

kkconst is a constant-tools library.

Support Types:

int, str, bytes, datetime

In PY2: with unicode

New Features

1.1.3
  1. bugfix
1.1.2
  1. fixed demos code
1.1.0
  1. Meta support ‘strict_capital’ attribute to require const class’s const variable capital naming.

Example

int: status_code

from __future__ import print_function
import json
from collections import OrderedDict
from kkconst import BaseConst, ConstIntField

class BaseStatusCode(BaseConst):
    class Meta:
        allow_duplicated_value = False  # status_code should be no duplicated value


class StatusCodeField(ConstIntField):
    def __init__(self, status_code, message=u"", description=u""):
        ConstIntField.__init__(status_code, verbose_name=message, description=description)
        self.message = message


class ServiceStatusCode(BaseStatusCode):
    SERVICE_UNAVAILABLE = StatusCodeField(10001, u"service unavailable", description=u"server is sleeping/服务打盹了")


status_code = ServiceStatusCode.SERVICE_UNAVAILABLE
assert isinstance(status_code, ConstIntField)
assert isinstance(status_code, int)

print(status_code.verbose_name) # "service unavailable"
print(status_code.description)  # "server is sleeping"

# for restful response
response_data = OrderedDict()
response_data["status_code"] = status_code
response_data["message"] = status_code.verbose_name  # also status_code.message is the same value
response_data["description"] = status_code.description
response_data["extra_message"] = "may you live in an interesting time"
print(json.dumps(response_data, indent=2))
# {
#    "status_code": 10001,
#    "message": "service unavailable",
#    "description": "server is sleeping",
#    "extra_message": "may you live in an interesting time"
# }
#
# def views(request):
#     ...
#     return HttpResponse(200, response_data, "application/json")
#

float: math constant

from __future__ import print_function
from kkconst import (
    BaseConst,
    ConstFloatField,
)

class MathConst(BaseConst):
    PI = ConstFloatField(3.1415926, verbose_name=u"Pi")
    E = ConstFloatField(2.7182818284, verbose_name=u"mathematical constant")  # Euler's number"
    GOLDEN_RATIO = ConstFloatField(0.6180339887, verbose_name=u"Golden Ratio")

magic_num = MathConst.GOLDEN_RATIO
assert isinstance(magic_num, ConstFloatField)
assert isinstance(magic_num, float)

print(magic_num)  # 0.6180339887
print(magic_num.verbose_name)  # Golden Ratio

str: system message

from kkconst import BaseConst, ConstStringField
# Python3 ConstStringField is equal to ConstUnicodeField
class SystemMessage(BaseConst):
    SERVICE_UNAVAILABLE = ConstStringField(u"service unavailable", verbose_name=u"Service is sleeping")
    PERMISSION_DENY = ConstStringField(u"permission deny", verbose_name=u"your have no permission")

datetime: released datetime

class ReleasedDatetime(BaseConst):
    PYTHON_2_0 = ConstDatetimeField("2000-10-16", verbose_name="PY2 Released")
    PYTHON_3_0 = ConstDatetimeField(datetime.datetime(year=2008, month=12, day=3), verbose_name="PY3 Released")

released_datetime = ReleasedDatetime.PYTHON_2_0
assert isinstance(field_value, ConstDatetimeField)
assert isinstance(field_value, datetime.datetime)

print(field_value)
print(field_value.verbose_name)  # "PY2 Released"
BaseConst: Your Const Helper
like peewee model’ Meta, we can use Meta to help manage the const variable
the Meta support such attributes:

allow_duplicated_value - bool
    default True,
    when set False, if exists a variable has the same as the another variable defined before,
    then raise AttributeError

strict_capital - bool
    default True, the ConstClass will check the const variable name,
    if name is not upper, then raise AttributeError
class ErrorCode(BaseConst):
    class Meta:
        allow_duplicated_value = False
        strict_capital = True

    USER_ID_NOT_EXISTS = ConstIntField(20001, verbose_name="USER_ID_ERROR")

    # will raise Error, because has the same with USER_ID_NOT_EXISTS
    # USER_EMAIL_INVALID = ConstIntField(20001, verbose_name="USER_EMAIL_ERROR")

    # will raise Error, because some letters are lowercase
    # User_Password_Invalid = ConstIntField(20003, verbose_name="USER_PASSWORD_ERROR")

Get It Now

$ pip install kkconst

License

MIT licensed. See the bundled LICENSE file for more details.

Requirements

  • Python >= 2.7 or >= 3.4
Release History

Release History

This version
History Node

1.1.3

History Node

1.1.2

History Node

1.1.0

History Node

1.0.26

History Node

1.0.25

History Node

1.0.24

History Node

1.0.24a

History Node

1.0.23

History Node

1.0.22

Download Files

Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
kkconst-1.1.3.tar.gz (6.0 kB) Copy SHA256 Checksum SHA256 Source May 24, 2016

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