如何通过修改特定值从另一个字典创建新字典（将两个键的值合二为一）

Question

I have reviewed many questions on stackoverflow where what is done is to iterate a dictionary through a for loop and change the value for a specific key.

Like this:

for key, value in inputdict.items():
    inputdict[key] = newvalue

Or just using update .

I have not found an answer for this specific case and the truth is that I do not know very well how to proceed.

Let's say I have the following dictionary:

dict1 = {
  "brand": "Ford",
  "model": "Mustang",
  "year": "1964"
}

And let's say I want a new dictionary (copying the previous dictionary but modifying the value of a certain key):

dict2 = {
  "brand": "Ford 1964",
  "model": "Mustang",
  "year": "1964"
}

Basically I want the same as dict1, but I want to 'merge' the values of the keys brand and model into the brand key.

(dict1) Ford -> (dict2) Ford 1964

How can I do that?

Answer 1

This perhaps?

dict2 = dict1.copy()
dict2['brand'] = ' '.join([dict2["brand"], dict2["year"]])

Answer 2

How about this?

def dict_update(dict1):
    dict2 = {}
    for key in dict1:
        if key == 'brand':
            dict2[key] = str(dict_['brand'])+' '+str(dict_['year'])
        elif key not in dict2:
            dict2[key] = str(dict_[key])
    return dict2

Answer 3

So this is what I did:

    dict2 = {}

    for key, value in dict1.items():
        if key == 'brand':
            for key2, value2 in dict1.items():
                if key2 == 'year':
                    dict2[key] = str(value) + " " + str(value2)
        else:
            dict2[key] = value

It works but I don't know if it's the most optimal solution (I don't like nesting for loops...but it's the only way I can think of to make it work)

Is there any other way to get the same result in python without importing libraries?

Any suggestions will be appreciated