Django

from django.contrib.gis.geos import GEOSGeometry, GEOSException

def convert_linestring(data):
    '''
     Get the route from the  array
     Convert the route in LineString object
    '''

    linestring_raw = ''
    k = 0
    for i in data:
        k += 1
        if i in linestring_raw:
            pass
        else:
            linestring_raw += i
            linestring_raw += ','
    wkt = "LineString({})".format(linestring_raw).replace(',)', ')')
    try:
        linestring = GEOSGeometry(wkt)
        linestring.srid = 4326
    except GEOSException:
        linestring = None
    return linestring

from django.contrib.gis.geos import GEOSGeometry, GEOSException


def convert_polygon(data):
    '''
     Get the polygon from the  array
     Convert the polygon in Polygon object
    '''

    polygon_raw_string = ''
    for i in data:
        if i in polygon_raw_string:
            pass
        else:
            polygon_raw_string += i
            polygon_raw_string += ' , '

    polygon_raw_string += data[0]
    wkt = "POLYGON(("+polygon_raw_string+"))"
    try:
        polygon = GEOSGeometry(wkt)
        polygon.srid = 4326
    except GEOSException:
        polygon = None
    return polygon

class BaseInlineFormSet(forms.BaseInlineFormSet):
    def clean(self):
        if any(self.errors):
            return
        for form in self.forms:
                # your code 
                raise forms.ValidationError( 'error message ')

class Timestamped(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    modified = models.DateTimeField(auto_now=True)

    class Meta:
        abstract = True

class FormMixin(object):

    def __init__(self, *args, **kwargs):
        super(FormMixin, self).__init__(*args, **kwargs)
        for field in self.fields:
            self.fields[field].widget.attrs['class'] = 'form-control'