[英]How to calculate percentage in python and django
我正在編寫一個簡單的程序,以允許用戶在十天內獲得他們投資的任何金額的 8% 的回報。 十天內的用戶余額將等於他/她投資的任何金額的百分之八,十天后該百分比余額將返回到用戶余額中。 看看我下面的代碼並幫助我。
模型.py
class Profile(models.Model):
user = models.ForeignKey(UserModel, on_delete=models.CASCADE)
balance = models.DecimalField(default=Decimal(0),max_digits=24,decimal_places=4)
class Investment(FieldValidationMixin, models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
amount = models.DecimalField(max_digits=5, decimal_places=2, null=True, blank=True)
fixed_price = models.DecimalField(max_digits=7, decimal_places=2, nulll=True, blank=True)
percentageee = models.DecimalField(max_digits=3, decimal_places=0, nulll=True, blank=True)
profile = models.ForeignKey(Profile, on_delete=models.CASCADE)
def __str__(self):
return _("{0}: (#{1}
{2}%, ${3})".format(self.__class__.__name__, self.amount, self.percentage, self.fixed_price) )
我想在這里獲取用戶投資金額的百分比
視圖.py
def get_percentage(self):
pef_of_amount = Investment.objects.filter(amount=self.amount).annotate(percentageee=Sum('amount'))
return '{:%}'.format(amount.percentageee / 8)
def percentile(self, days=10):
percent=Investment.objects.filter(self.amount*self.percentage)/100 in days
return percentile
#獲取十天后投資金額的百分比余額
def get_current_balance(self,percentile):
total_expenses = Profile.objects.all().aggregate(Sum('balance')).annonate(percentile)
return get_current_balance
這是獲得8%金額的方法:
class Investment(FieldValidationMixin, models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
amount = models.DecimalField(max_digits=5, decimal_places=2, null=True, blank=True)
fixed_price = models.DecimalField(max_digits=7, decimal_places=2, nulll=True, blank=True)
percentageee = models.DecimalField(max_digits=3, decimal_places=0, nulll=True, blank=True)
profile = models.ForeignKey(Profile, on_delete=models.CASCADE)
def get_percentage(self):
return self.amount * 0.08
這是一個如何調用它的示例:
i = Investment()
i.amount = 100
result = i.get_percentage()
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