How can I add float values together from a dictionary of mixed lists?-CodePudding

I am trying to add together values from mixed-value lists in a dictionary:

sampledict = {key1:[str1,float1],key2:[str2,float2], key3:[str3,float3]}

all_floats = float1 float2 float3

I will preface that I am fairly new to coding so I apologize for any lack of clarity.

I tried a TypeError exception to isolate the floats, but ran into errors. I tried using sum(), but it didn't like the mixed data type.

CodePudding user response：

Each value in your dictionary is a list.
In each list, the float you care about is the second element.
So for each value in your dictionary, you want to add up the second element of that list

Let's do that:

total = sum(value[1] for value in sampledict.values())

Or, if you want a regular loop, initialize total=0 before the loop, and then keep adding value[1] to it inside the loop:

total = 0
for value in sampledict.values():
    total  = value[1]

CodePudding user response：

This is how I'd probably do it:

Step 1: gather all the data...

my_dict = {
    'key1':["str1", 1.0112, 1],
    'key2':["str2", 2.3121, 5], 
    'key3':["str3", 1.5123, 'z']
}

# this grabs all the values using list instantiation and puts them in one list
all_values = sum([ value for key,value in my_dict.items() ], [])

Iterate over the list of items and take only the type you want

# iterrate over that list and select only the ones of type float (or whatever)
floats     = [ value for value in all_values if type(value) == float ]

Add up the floats (or whatever)

print(sum(floats))