from server import app

def load_example(path):

with open(path, 'r') as _f:

_source = _f.read()

_example = _source

# Use the global app assignment

if 'app = dash.Dash' not in _example:

raise Exception("Didn't declare app")

_example = _example.replace('app = dash.Dash', '# app = dash.Dash')

commented_configs = [

'app.scripts.config.serve_locally',

'app.css.config.serve_locally'

]

for config in commented_configs:

_example = _example.replace(

config,

'# {}'.format(config)

)

if 'import dash\n' not in _example:

raise Exception("Didn't import dash")

# return the layout instead of assigning it to the global app

if 'app.layout = ' not in _example:

raise Exception('app.layout not assigned')

_example = _example.replace('app.layout = ', 'layout = ')

# Remove the "# Run the server" commands

if 'app.run_server' not in _example:

raise Exception('app.run_server missing')

_example = _example.replace(

'\n app.run_server',

'print("Running")\n # app.run_server'

)

scope = {'app': app}

try:

exec(_example, scope)

except Exception as e:

print('\nError running {}\n{}'.format(

path,

('======================================' +

'======================================')

))

raise e

return (

_source,

scope['layout'] # layout is a global created from the app

)

def merge(*dict_args):

"""

Given any number of dicts, shallow copy and merge into a new dict,

precedence goes to key value pairs in latter dicts.

"""

result = {}

for dictionary in dict_args:

result.update(dictionary)

return result