[Solved] Rename all key in dictionaries

jason Asks: Rename all key in dictionaries
I have a dictionary, with this value:

Code:
d = {'apple':0, 'banana':1, 'mango':2, 'grava':3}

I would like to rename all the key in d to 'fruit', so that the end results will be like this:

Code:
d = {'fruit':0, 'fruit':1, 'fruit':2, 'fruit':3}

So,I try the code below:

Code:
d = {"fruits" if k != '' else k:v for k,v in d.items()}
print(d)

But,the result is : {'fruits': 0}

What could possibly be going wrong here? Thanks

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