Question

In Python, I have a dictionary with strings as keys, and strings or list of number as the associated values. How to do arithmetic operations like sum() on the list of numbers using for-in loop statement on the dictionary ...?

Answer 1

You might want to try this.
i=0
for x in range(0,len(list)):
i += list[x]
print (i)

though I'm all out for a more elegant one.

Answer 2

weird... i've answered to this one this morning, then it disapeared...

d = {
"monday" : [25, 22],
"tuesday" : "nothing",
"wednesday" : [9, 8, 7],
"thursday" : [30, 12]
}

for v in d.values():
if type(v)==list:
print sum(v)


for k, v in d.items():
if type(v)==list:
print k, ":", sum(v)
else:
print k, ":", v

Answer 3

the two "for" show possible solutions if you don't care about key or if you do...

Answer 4

Thanks @Shadowys and @FabienToune. I'll try your methods and let you know..