python字典，每个键或类有两个值？

Question

I need a data structure of this form:

   test_id1: resultValue, timeChecked
   test_id2: resultValue, timeChecked
   test_id3: resultValue, timeChecked
   test_id4: resultValue, timeChecked
   ...

up until now I have dealt with it by just using a dictionary with key value for the id and the result. But I would like to add the time I checked. What would be the best way to do this? Can I make the value a tuple? Or is a new class better suited in this case? What would my class need to look like to accommodate the above?

Answer 1

One lightweight alternative to making a class that both 1) retains the simplicity of a tuple and 2) allows named (as opposed to positional) field access is namedtuple .

from collections import namedtuple

Record = namedtuple("Record", ["resultValue", "timeChecked"])
s = {"test_id1": Record("res1", "time1"), "test_id2": Record("res2", "time2")}

You can now use the values in this dict as if you had a class with the resultValue and timeChecked fields defined...

>>> s["test_id1"].resultValue
'res1'

...or as simple tuples:

>>> a, b = s["test_id1"]
>>> print a, b
res1 time1

Answer 2

Can I make the value a tuple?

Yes, and I'm not really sure why you don't want to. If it's to make look-ups easier to read, you can even make the value another dictionary.

{"test_id1" : (resultValue, timeChecked)}

or

{"test_id1" : {"resultValue": resultValue, "timeChecked" : timeChecked }}

I think a whole new class is overkill for this situation.

Answer 3

You could also use a pandas DataFrame for your whole structure. It's probably waaaay overkill unless you're planning to do some serious data processing, but it's a nice thing to know about and directly matches your problem.