extract value from loop within a loop

Question

I have a list of lists and i am trying to loop through to create a new value in the second list based on two elements with the second list.

for line in input_list[1:]:
i = 0
for element in line:
    if i == 13:
        if line[7] > line[8]:
            line[13] == 1
        else:
            line[13] == 0
    i += 1

I am trying to set the value of line[13] based on the condition that line[7] is greater than line[8].

The code does not flag any errors, so syntactically it is correct, but when i print for the new list, it does not display any values (0 or 1) for line[13].

Any help would be much appreciated.

Thanks,

Ed

can you please show me your list of data, that can help me to solve this. — ammy
– ammy, Commented Jun 15, 2017 at 6:13
I do strongly recommend using a checker like "pylint". It would warn you with: Statement seems to have no effect (pointless-statement). — VPfB
– VPfB, Commented Jun 15, 2017 at 6:52

Rahul Sharma · Accepted Answer · 2017-06-15 06:11:54Z

3

Use line[13] = 1 instead of line[13] == 1. == is for comparison.

answered Jun 15, 2017 at 6:11

Rahul Sharma

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Comments

kuro · Accepted Answer · 2017-06-15 06:26:27Z

1

It will not show the correct output because you haven't use assignment operator . use line[13] = 1 instead of line[13] == 1 Example :- list= [[1,2],[3,4,5]]

For this list -

for line in list[1:]:
  i=0
  for element in line:
    if i==1:
       if line[0]>line[1]:
          line[1]=1
       else:
          line[1]=200
    i=i+1

It will work

edited Jun 15, 2017 at 6:26

kuro

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answered Jun 15, 2017 at 6:15

praneet drolia

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Comments

ammy · Accepted Answer · 2017-06-15 06:22:46Z

0

for line in input_list[1:]:
    i = 0
    for element in line:
        if i == 13:
            if line[7] > line[8]:
                line[13] = 1
            else:
                line[13] = 0
        i += 1

code updated

edited Jun 15, 2017 at 6:22

answered Jun 15, 2017 at 6:18

ammy

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