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def lower(obj):
    return obj.lower()

def lower_dict(obj):
    return _recursive_key_op(obj, lower)

def _recursive_key_op(obj, op=None):
    if isinstance(obj, dict):
        return {op(k): _recursive_key_op(v, op) for k, v in obj.items()}
    elif isinstance(obj, (list, set, tuple)):

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# from http://flask.pocoo.org/docs/1.0/cli/

# Setting Command Options

# Click is configured to load default values for command options from environment variables. The variables use the pattern FLASK_COMMAND_OPTION. For example, to set the port for the run command, instead of flask run --port 8000:

export FLASK_RUN_PORT=8000
flask run
 * Running on http://127.0.0.1:8000/

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// https://redux.js.org/recipes/writing-tests
// https://facebook.github.io/jest/docs/en/webpack.html

npm i -D jest babel-jest transform-es2015-modules-commonjs


// package.json
{
    ...
    "jest": {

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// https://stackoverflow.com/questions/34614812/error-in-index-js-module-build-failed-syntaxerror-unexpected-token#34619867

// .babelrc

{
  "presets": [
    "react",
    "env"
  ],
  "plugins": [

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rsvg-convert img.svg > img.png
rsvg-convert -h 256 img.svg > img.png

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from django.test.client import Client

client = Client()
response = client.get(some_url)
request = response.wsgi_request

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# https://stackoverflow.com/questions/49847800/how-can-setuptools-dependency-links-be-used-with-the-latest-master-branch-of

setup(
    ...
    install_requires=[
        'krakenex;python_version<3',
        'krakenex3;python_version>=3',
    ],
    dependency_links = [
        "git+https://github.com/veox/python2-krakenex.git#egg=krakenex;python_version<'3.0'",

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# https://stackoverflow.com/questions/11621768/how-can-i-make-git-accept-a-self-signed-certificate#11622001

# copy public key from remote git host into pub file:
    
~/.ssh/id_rsa_custom1.pub

# edit global git config

~/.gitconfig

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from unittest.mock import patch

class settings:
    FIRST_PATCH = 1
    SECOND_PATCH = 2

with patch.multiple(settings, FIRST_PATCH='one', SECOND_PATCH='two'):
    assert settings.FIRST_PATCH == 'one'
    assert settings.SECOND_PATCH == 'two'
    

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import os, glob
from distutils.version import StrictVersion

def get_version(filename):
    return os.path.splitext(filename)[0].split('-')[-1]


def _get_major_version(get_version_func):
    def major_version(file_names=[]):
        major_version_file = file_names[0]