remove keys from dict based on value example nan

how can I delete the keys in a dictionary that has values nan ? with and without creating new dictionary ?

example:

my_dictionary = dict(
    first=float("nan"),
    second="second"
)

expecting:

{'second': 'second'}

{k:v for k,v in my_dictionary.items() if not isnan(v)} 

does not work because isnan(v) takes only number as parameter

>Solution :

Perhaps you can use a dict comprehension using the fact that NaN is not equal to NaN:

out = {k:v for k,v in my_dictionary.items() if v==v}

or using math.isnan:

out = {k:v for k,v in my_dictionary.items() if not isinstance(v, float) or not math.isnan(v)}

Output:

{'second': 'second'}