CODEWITHSUNDEEP
pythonlistdictionarykey
CarterB
CarterB

Reputation: 542

Casting a value in a dictionary from str to float

I have been trying to look at other questions and not found anything that works for me. I have a list if dictionaries (trips) and want to access the values in each dictionary within the list of trips, and convert if from a string to a float.

If i take trips[0] output is: 

# {'pickup_latitude': '40.64499',
#  'pickup_longitude': '-73.78115',
#  'trip_distance': '18.38'}

I am trying to build a function that iterates through the list of dictionaries, accessing the values and transferring them to floats.

I have tried various versions of the code below, including trying to build a new dictionary and returning that

def float_values(trips):
    for trip in trips:
        for key, value in trip.items():
            value = float(value)
        return

float_values[0] should output:

# {'pickup_latitude': 40.64499,
#  'pickup_longitude': -73.78115,
#  'trip_distance': 18.38}

Continuously getting

'function' object is not subscriptable'

OR

'NoneType' object is not subscriptable

Upvotes: 2

Views: 409

Answers (2)

Matteo Peluso
Matteo Peluso

Reputation: 452

If you what to override your values from the dictionary you should do something like this

def float_values(trips):

    for trip in trips:
        for key, value in trip.items():
            trip[key] = float(value)

    return trips

By doing value = float(value) you are writing temporary the float value and not saving it anywhere

Upvotes: 2

Toni Sredanović
Toni Sredanović

Reputation: 2392

Simply what you need to do is change value inside the dictionary:

for list_dict in list_of_dicts:
    for key, value in list_dict.items():
        list_dict[key] = float(value)

Upvotes: 1

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