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Inside your application directory, create a file your_app/signals.py.

The default project and app creator should have created a file your_app/apps.py. Inside the class used for your app, add the ready method:

class YourAppConfig(AppConfig):
    name = 'your_app'

 def ready(self):

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First of all, edit your_app_settings/settings.py and add:

INSTALLED_APPS = [
    'django.forms',  # to let django discover the built-in widgets
    ...
]

FORM_RENDERER = 'django.forms.renderers.TemplatesSetting'

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Manually provide the id with:

# forms.py
class SomethingForm(...):
    id = forms.IntegerField(min_value=0)

# serializers.py
class SetIDFieldFromModel:
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

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# --- forms.py ---

class CSVImportForm(forms.Form):

    file = forms.FileField()
    comment = forms.CharField(max_length=50, required=False)

    
# --- utils.py ---

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from django import forms

# https://github.com/django/django/blob/master/django/forms/widgets.py
class HTML5DateWidget(forms.widgets.Input):
    input_type = 'date'
    template_name = 'django/forms/widgets/date.html'

    
    
# Example:

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Create a dir to build things into:

  $ mkdir ~/stack && cd ~/stack

Download the sources (sqlite 3230100 was broken, 3220000 was used instead):

  $ wget https://www.openssl.org/source/openssl-1.1.0h.tar.gz
  $ wget https://sqlite.org/2018/sqlite-src-3220000.zip
  $ wget https://www.python.org/ftp/python/3.6.5/Python-3.6.5.tar.xz

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Setup virtualenvwrapper on Ubuntu 16.04 or Fedora 25+

Install virtualenvwrapper, which eases the handling of Python virtualenvs (sort of Virtual Machines for Python packages).

$ pip3 install --user virtualenvwrapper

Add to your ~/.bashrc, or better, to your ~/.bash_profile:

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/*
Da compilare su linux con:
gcc -o allocation_examples allocation_examples.c
oppure se si vuole usare il vecchio standard del C dell'89:
gcc --std=c89 -o allocation_examples allocation_examples.c

Si puo' poi eseguire facendo:
./allocation_examples
*/