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Runtime context

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.. code-block:: shell

pip install runtime-context

``RuntimeContextWrapper`` Example

.. code-block:: python

from runtime_context import RuntimeContextWrapper

runtime_context = RuntimeContextWrapper()

def do_something(i):
if runtime_context.dry_run:
print('{} - dry run'.format(i))
print('{} - for real'.format(i))

with runtime_context(dry_run=False):
do_something(1) # for real

with runtime_context(dry_run=True):
do_something(2) # dry run

runtime_context.dry_run = False
do_something(3) # for real

with runtime_context():
do_something(4) # for real

runtime_context.dry_run = True
do_something(5) # dry run

do_something(6) # for real

``runtime_context_env`` Example

.. code-block:: python

import json
from typing import Union # noqa

from runtime_context import EnvBase, runtime_context_env # noqa

class YourApp:
dry_run = False
db_name = None
config_file = None

env = YourApp() # type: Union[YourApp, EnvBase]

@env.context_var_set.listener(predicate=lambda name: name == 'config_file')
def reload_config():
if not env.config_file:

print('Reloading config from {}'.format(env.config_file))
with open(env.config_file) as f:
config = json.load(f)
for k, v in config.items():
env.set(k, v)

with env():
assert env.dry_run is False
assert env.db_name is None

env.config_file = 'config.json' # prints 'Reloading config from config.json'

assert env.db_name == 'products' # read from config.json file

with env(dry_run=True):
assert env.dry_run is True

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