snuff-utils 1.1.2

Universal functions and decorators and some packages extras

shuff-utils

General-purpose classes and functions.

Installation

pip install -i shuff-utils

DottedDict

dict that allows you to call its keys with the dot.

d = DottedDict({'a': 'test'})
d.a
# 'test'
d = DottedDict(a='test')
d.a
# 'test'

Timer

Class for measuring an execution time.

# Init and set name of the whole period
timer = Timer('whole_period')
# Start custom measurement
timer.add_point('first block')
...
timer.add_point('second block')
...
# Stop custom measurement
timer.stop('first block')
timer.add_point('third block')
...
# Stop all the intervals and print summary details
timer.stop().print_summary()
# [2017-10-09 17:06:10 INFO] PROFILING: whole_period: 5000, first block: 3000, second block: 2000, third block: 2000

Flask functions

token_required - Bearer token decorator

Decorator that checks Bearer (static) Authorization token

Usage:

import os

from dotenv import load_dotenv
from flask_restful import Resource
from snuff_utils.flask_decorators import token_required

# Get token from .env file
load_dotenv()
MY_TOKEN = os.getenv('MY_TOKEN', '')


class CallbackEvents(Resource):

    @token_required(MY_TOKEN)
    def post(self):
        # some code here
        return {}

date and time

localize

Converts naive time to local time.

localize(some_date, new_timezone='UTC', force=False)

force param forces timezone replacement to new_timezone.

from datetime import datetime
from pytz import UTC
date = datetime(2019, 12, 12, 2, 34)
localize(date)
# datetime.datetime(2019, 12, 12, 2, 34, tzinfo=<UTC>)
localize(date, UTC)
# datetime.datetime(2019, 12, 12, 2, 34, tzinfo=<UTC>)
localize(date, 'Europe/Samara')
# datetime.datetime(2019, 12, 12, 2, 34, tzinfo=<DstTzInfo 'Europe/Samara' LMT+3:20:00 STD>)
date = localize(date, UTC)
localize(date, 'Europe/Samara')
# datetime.datetime(2019, 12, 12, 2, 34, tzinfo=<UTC>)
localize(date, 'Europe/Samara', force=True)
# datetime.datetime(2019, 12, 12, 2, 34, tzinfo=<DstTzInfo 'Europe/Samara' LMT+3:20:00 STD>)

as_timezone

Returns the same UTC time as self, but in as_tz’s local time. Inherits datetime.astimezone behaviour.

as_timezone(source_date, as_tz='UTC', source_tz_by_default='UTC')

>>> from datetime import datetime
>>> from pytz import UTC
>>> date = datetime(2019, 12, 12, 2, 34)
>>> as_timezone(date, UTC)
datetime.datetime(2019, 12, 12, 2, 34, tzinfo=<UTC>)
>>> as_timezone(date, 'Europe/Samara')
datetime.datetime(2019, 12, 12, 6, 34, tzinfo=<DstTzInfo 'Europe/Samara' +04+4:00:00 STD>)
>>> as_timezone(date, 'Europe/Samara', source_tz_by_default='Europe/Samara')
datetime.datetime(2019, 12, 12, 2, 34, tzinfo=<DstTzInfo 'Europe/Samara' +04+4:00:00 STD>)

Input/output functions

sv_import

Imports csv or other -sv files.

Let's say you have csv file with two columns and two rows of values, columns are separated by semicolon (;). Like this:

ID;Name
123;Jimmy
456;Andrew

from snuff_utils.io_utils import sv_import
rows = sv_import('/path/to/sv_file.csv', sep=';')
for row in rows:
    print(row)
# {'ID': '123', 'Name': 'Jimmy'}
# {'ID': '456', 'Name': 'Andrew'}

Function returns a generator. To get list of dicts convert result to a list:

rows = sv_import('/path/to/sv_file.csv', sep=';')
data = list(rows)
# [
#   {'first column': 'first row value', 'second column': 'first row value'},
#   {'first column': 'second row value', 'second column': 'second row value'}
# ]

Sorting

cmp_by_weight

Comparison by weight for sorted.

Allow sorting by dicts. If dicts are not in a weight sequence, their weights are equal. partial defines if a dictionary from a list must match for all keys (or only for comparison dict keys).

>>> sorted('a,r,b,c,d,e'.split(','), key=cmp_by_weight('c,a,d,b'))
['c', 'a', 'd', 'b', 'e', 'r']

>>> sorted([1, 2, 3, 4, 5, 6, 7], key=cmp_by_weight(1, 5, 7))
[1, 5, 7, 2, 3, 4, 6]

>>> my_list = [{'a': 1}, {'b': 2}, {'c': 5, 'a': 2}]
>>> sorted(my_list, key=cmp_by_weight({'c': 5}, {'b': 2}))
[{'b': 2}, {'a': 1}, {'c': 5, 'a': 2}]

>>> sorted(my_list, key=cmp_by_weight({'c': 5}, {'b': 2}, partial=True))
[{'c': 5, 'a': 2}, {'b': 2}, {'a': 1}]

Universal

popattr

popattr(obj, attr, default)

Alias for sequential calls of getattr and delattr. Similar to dict.pop. Default value is None.

>>> class A: pass
>>> a = A()
>>> setattr(a, 'some', 5)
>>> popattr(a, 'some')
5
>>> popattr(a, 'some')

>>> popattr(a, 'some', 'default')
'default'

Other functions

Other functions is not described yet. You can see them in the corresponding modules. Some of them have descriptions in their docstrings.

Changelog

1.0.9 (2021-02-01)

• Added partial sorting for list of dicts (cmp_by_weight).

1.0.8 (2020-12-09)

• Added append_to_list and add_to_set params to group_list_of_dicts function.

1.0.7

• Added popattr function.

1.0.6

• Added sv_import documentation.

1.0.5

• Fixed date_and_time.localize behaviour for non-pytz timezones. Added tests.

1.0.4

• Added extended_filter parameter to marshmallow_extras.convert_to_instance.

1.0.3

• marshmallow_extras.convert now can take many functions as arguments.
• Added marshmallow_extras.convert_items function.
• Added marshmallow_extras.apply function - with it deserialize parameter can apply many functions to value.

1.0.2

• Project directories included.

1.0.1

• Updated token_required decorator.

1.0.0

• Init version.

Naming

The package is named after Slipknot's song. Thanks to the band, it helps a lot.