🔒 How do I exponentiate the numbers and sum then after that

[barren oak]

I need just to exponentiate the numbers by the last one, for example if I insert 42 the number 4 must be exponentiated by the number 2, if 63 the number 6 by 3 and etc... after that I need to sum all of the results, to do this a tried to separate the values in two different lists but nothing that I do now works properly, please help me find out what do I need to implement or even if I can proceed to get the results I want with my code.

#Get the quantity of terms
n = int(input("Quantity of terms: "))

#List to store the expressions.
lista_n = []

#Loop to add the terms in the list.
for c in range(n):
t = int(input("Terms: "))
lista_n.append(t)

#Separated list of the exponents (the last value of each item).
exponents = [str(item)[-1] for item in lista]

#Separated list of the rest of the numbers.
numbers = [str(item)[:-1] for item in lista]

#Print to see if its all correct (It is until now)
print(exponents)
print(numbers)

[bitter cobalt]

@barren oak

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[flat oxide]

Do you know how to do exponents in python?

[barren oak]

I can use the ** can't I?

[flat oxide]

Yes, exactly

[boreal birch]

to do exponents in python, you use **, so 8^2 is 8**2. For this problem, you could probably use list comprehension. something like:

results = [numbers[i]**exponents[i] for i in range(len(exponents))]

(i hope)

[flat oxide]

This is ok, but there's better ways to do it, and this might be a bit overwhelming if they haven't used list comp yet

[flat oxide]

Right now you have numbers and exponents

you want to basically take each number in numbers, and put it to the power of the number in exponents in the same index position

so numbers[0] ** exponents[0], then numbers[1] ** exponents[1], and so on

do you see a pattern here?

[barren oak]

I've tried something like this and it keeps me returning the same error results = [numbers[i]**exponents[i] for i in range(len(exponents))]
^^~~
TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'str'

[flat oxide]

ahh yes, so currently you've converted all your numbers to str so you were able to slice the first and last numbers

but if you want to do that math, you'll need to convert back to int

[barren oak]

I was studying list comprehension just to solve this problem

[barren oak]

Uhmmmm I think so, I need to use their index, but in a better way to this what should I do, use len?

[flat oxide]

the better way to do this would be using zip()

but len and range would work otherwise

[barren oak]

I've already tried zip also like this

example = zip(numbers, exponents)
for expressions in example:
print(expressions)

And it returns me the right values

[flat oxide]

A neat thing you can do with zip and for loops is you can use multiple variables

for num, exp in zip(numbers, exponents):

[barren oak]

So I just need to convert back to int, sir?

[flat oxide]

yes

you can't do exponents with strings

[barren oak]

Appreciate it, I'll try it right now

[barren oak]

I did it, THANK YOU

[flat oxide]

🎉

[bitter cobalt]

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