Goal: Learn to read structured files line by line.

Assignment: A file named units.txt records the contents of the containers in a logistic hub. Each line contains the number of items, and each container section is separated from the next by a line with a dash. The following is an example file:

Contents of units.txt

$10$

$123$

$95$

$-$

$285$

$64$

Write some code that creates a file named totals.txt in which each line is the sum of all the item counts per container section. Continuing the above example, the following is the example result:

Contents of totals.txt

$228$

$349$

$****$ The issue $***$

I keep getting an error that says:

$`$totals$.$txt$`$ was expected to be $3$ lines long, but it was $4$ lines long. However, if I remove the

$($new line$)$ I get that I

get this error

$`$totals$.$txt$`$ was expected to be $2$ lines long, but it was $3$ lines long.

Please review my code & Advise

$**$ My code $**$

# Variables initialized

totals $=[]$

current$\_$sum $=0$

# Open the units.txt file for reading

with open$(\text{'}$units$.$txt$\text{'},\text{'}$r$\text{'})$ as units$\_$file:

$$ # Read each line in the units.txt file

$$ for line in units$\_$file:

$$ line $=$ line.strip$()$

$$ if line $=="-"$:

$$ line $=$ line.strip$(\text{'}-\text{'})$

$$ totals.append$($totals$)$

$$ current$\_$sum $=0$

$$ else:

$$ current$\_$sum $+=$ int$($line$)$

$$ if current$\_$sum $>0$:

$$ totals.append$($totals$)$

# Open the totals.txt file for writing

with open$(\text{'}$totals$.$txt$\text{'},\text{'}$w$\text{'})$ as totals$\_$file:

$$ for total in totals:

$$ totals$\_$file.write$($str$($total$)+\text{'}$

$\text{'})$