Python几何序列总和

Question

I would like to calculate the sum of the first 25 numbers in the sequence: 2, 4, 8, 16, 32....

Why am I receiving an output that says the sum is 50 when it should be higher?

 t = 2
    sum = 0
    for i in range (1, 26) :
        sum += t
    t *= 2
    print("i: ", i, "t: ", t, "sum: ", sum)
    i:  25 t:  4 sum:  50

Answer 1

It's just a little typo, in the loop, your adding t to sum , when it should be t**i , and also, it's not good to name variables a replica of a existing keyword, that makes you unable to access that keyword.

So do (whole code):

t = 2
s = 0
for i in range (1, 26) :
    s += t
    t *= 2
print("i: ", i, "t: ", t, "sum: ", s)

Alternatively, you can do:

t = 2
s = 0
for i in range (1, 26) :
    s += t**i
print("i: ", i, "t: ", t**i, "sum: ", s)