For Loop Works Fine But Append For Pandas Doesn't Work

[deanhystad]

I am confused about your confusion. The code works exactly as I would expect. Here is an even simpler example that demonstrates the behavior.

numbers = []
for number in range(5):
    print(number)
    numbers.append(number)
    print(numbers)

Output:
0
[0]
1
[0, 1]
2
[0, 1, 2]      
3
[0, 1, 2, 3]   
4
[0, 1, 2, 3, 4]

Since a number is appended to numbers each time through the loop I would expect numbers to be longer each time it is printed. This is just like your example where you nprofit to net_profits.

Do you only want to print net_profits after all the values are added?

numbers = []
for number in range(5):
    print(number)
    numbers.append(number)
print(numbers)

Output:
0
1
2
3
4
[0, 1, 2, 3, 4]