python中的动态变量名 [英] Dynamic variable name in python

问题描述

我想调用一个字段名称过滤器的查询，我不会在运行时间之前知道...不知道如何构造变量名称...或者也许我很累。

  field_name = funct（）
 locations = Locations.objects.filter（field_name__lte = arg1）
  / pre> 
 
 
如果funct（）返回名称等于
  locations = Locations.objects.filter（name__lte = arg1）
  
不知道该怎么做
解决方案
您可以创建一个字典，设置参数并将其传递给将字典解包为关键词参数：
  field_name = funct（）
 params = {field_name +'__lte'：arg1，＃field_name应该还包含字符串
'some_other_field_name'：arg2} 
 
位置=位置.objects.filter（** params）
 
＃与（假定为field_name ='some_name'）相同：
＃Locations.objects.filter（some_name__lte = arg1，some_other_field_name = arg2） 
  
 
I'd like to call a query with a field name filter that I wont know before run time... Not sure how to construct the variable name ...Or maybe I am tired.
field_name = funct()
locations = Locations.objects.filter(field_name__lte=arg1)
where if funct() returns name would equal to
locations = Locations.objects.filter(name__lte=arg1)
Not sure how to do that ...
解决方案
You can create a dictionary, set the parameters and pass this to the function by unpacking the dictionary as keyword arguments:
field_name = funct()
params = {field_name + '__lte': arg1,       # field_name should still contain string
          'some_other_field_name': arg2}

locations = Locations.objects.filter(**params)

# is the same as (assuming field_name = 'some_name'):
# Locations.objects.filter(some_name__lte=arg1, some_other_field_name=arg2)


                        
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