将字符串作为键控参数传递给函数

时间:2015-09-14 21:16:34

标签: python django

我试图将一个参数传递给一个带有键的方法来获取Django查询集。密钥取决于用户通过的内容。

以下是一个例子:

filter的初始值将是id = 1(一个字符串),如果用户传入其他过滤器,我会包含基于逗号的分割,例如title = blahblahblah

            filter_split = filters.split(",")
            itemFilter = Items.objects # from Django
            for f in filter_split:
                itemFilter = itemFilter.filter(f)

我还尝试将剩余的字符串拆分为两个单独的值(键和值)并按原样传递它们:

itemFilter = itemFilter.filter(key = value)

没有运气。

如何将编程参数传递给Python中的方法?或者是否有另一种方法以Django以编程方式过滤查询集?

2 个答案:

答案 0 :(得分:1)

传递字符串是不可能的,例如"id=1"来过滤。

您可以动态创建字典,然后使用**解包将其传递给过滤器。

key = "id"
value = 1
kwargs = {key: value}
MyModel.objects.filter(**kwargs)

尝试MyModel.objects.filter(key=value)的其他方法不起作用,因为它不使用变量键,它会尝试过滤字段'key'

答案 1 :(得分:1)

您可以在参数列表中使用[1] Original app was compiled into a jar file, the jar file was doing copy-paste correctly either direction [2] But the jar file can't be pined to the taskbar [3] So I used exe4j to compile it into an exe file to be able to pin to the tackbar [4] The result exe file can't do copy-paste correctly [ exe4j issue ] [5] I found a way to pin jar file to the taskbar through a javaw.exe -jar *.jar shortcut,and pin that shortcut to the taskbar *list传递编程参数。

**dict

在您的情况下,只需创建一个字典,从用户输入中分配键值对并调用a = [2,3,4] function(1, *a) # equal to function(1,2,3,4) b = {'x':42, 'y':None} function(1, **b) # equal to function(1, x=42, y=None)

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