总结 Python 中直到列表末尾的行的所有列

Question

list=[[a],[b]]

it should return

1.values sum of list[a]

2.perform some operation

3.and then go back to (1) and do sum of list[b]

I tried below code:

K=[[a],[b]]
for ind,ele in enumerate(k):
    d=ele
    print(d)
    for j in range(len(d)):
        tot=tot+d[j]
        count=count+1
        print(tot)
    Avg=tot/count

Problem with this is it is performing only once i,e sum(k[a]) Your inputs are much appreciated

Answer 1

Here's a version of your code with just enough added to the top of it to allow it to run, along with a few extra print statements added to show the values that Avg takes on during execution (and one typo fixed...you were using both 'k' and 'K' for the name of the input list):

a = 23
b = 1234
count = 0
tot = 0

k=[[a],[b]]
for ind,ele in enumerate(k):
        # count = 0
        # tot = 0
        d=ele
        print(d)
        for j in range(len(d)):
            tot=tot+d[j]
            count=count+1
            print(tot)
        Avg=tot/count
        print("The average at this point is:", Avg)

print("The average of all values is:", Avg)

Result:

[23]
23
The average at this point is: 23.0
[1234]
1257
The average at this point is: 628.5
The average of all values is: 628.5

Result with initialization lines uncommented:

[23]
23
The average at this point is: 23.0
[1234]
1234
The average at this point is: 1234.0
The average of all values is: 1234.0

This code works fine. It shows that your inner loop is executed twice, once per element in 'k/K'. Per your description, it seems like you want to isolate the sum of each sub-list so that the result of summing earlier lists does not affect Avg for the current list you are processing. If that's the case, then you should initialize tot and count at the top of each iteration of your outer loop. You can do that by uncommenting the two lines I provide above that set those values to 0 inside the outer loop. If you do this, then you don't need to initialize these values at the top of the code.

So this shows your code working just fine. Given what I've said, what is the problem you're having?