[英]Django calculate percentage for population pyramid
我有一个按性别和年龄组划分的人口数据集,0-4 个男性人口,0-4 个女性人口等。
我尝试在 views.py 中计算百分比,但效果不佳。 所以我想在models.py中计算一次并将其保存在我的数据库中。
class Pyramid(models.Model):
city = models.CharField(max_length=15)
year = models.IntegerField(default=0)
men_population_0_4 = models.IntegerField(default=0)
women_population_0_4 = models.IntegerField(default=0)
men_population_5_9 = models.IntegerField(default=0)
women_population_5_9 = models.IntegerField(default=0)
.
.
.
men_population_90_over = models.IntegerField(default=0)
women_population_90_over = models.IntegerField(default=0)
def __str__(self):
return '%s %s' % (self.city, self.year)
所以首先我需要计算总男性和女性人口,然后根据models.py中的每个性别和年龄组计算百分比并将其存储到数据库中。
视图.py
def Pyramid(request):
dataset = models.Pyramid.objects.all()
datasett = models.Pyramid.objects.annotate(
sum_men=(
F('men_population_0_4') + F('men_population_5_9')
+ F('men_population_10_14') + F('men_population_15_19')
+ ...
+ F('men_population_90_over')
),
men_population_0_4_perc=(100*F('men_population_0_4') / F('sum_men')),
men_population_5_9_perc=(100*F('men_population_5_9') / F('sum_men')),
...
)
context = {
'dataset': dataset,
'datasett': datasett,
}
return render(request, 'pyramid.html', context)
金字塔.html
{% for item in datasett %}
{{ item.sum_men }}
{{ item.men_population_0_4_perc }}
{{ item.men_population_5_9_perc }}
{% endfor %}
我在下面试过,它有效
模型.py
class Pyramid(models.Model):
city = models.CharField(max_length=15)
year = models.IntegerField(default=0)
men_population_0_4 = models.IntegerField(default=0)
women_population_0_4 = models.IntegerField(default=0)
men_population_5_9 = models.IntegerField(default=0)
women_population_5_9 = models.IntegerField(default=0)
.
.
.
men_population_90_over = models.IntegerField(default=0)
women_population_90_over = models.IntegerField(default=0)
men_population_sum = models.IntegerField(default=0)
women_population_sum = models.IntegerField(default=0)
def men_population_0_4_percentage(self):
perc = self.men_population_0_4 * 100 / self.men_population_sum
return perc
def women_population_0_4_percentage(self):
perc = self.women_population_0_4 * 100 / self.women_population_sum
return perc
.
.
.
def __str__(self):
return '%s %s' % (self.city, self.year)
但这不是保存在数据库中
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.