While solving the third project of Scientific Computing with Python, it is giving spacing issues. I have tried looking at my code but I have not been able to find anything. Can anyone help me with this?

After copying test output out of repl.it it’s a bit easier to see what is wrong:

- 100|
+ 100|
? +
- 90|
+ 90|
? +
- 80|
+ 80|
? +
- 70| o
+ 70| o
? +
- 60| o
+ 60| o
? +
- 50| o
+ 50| o
? +
- 40| o
+ 40| o
? +
- 30| o
+ 30| o
? +
- 20| o o
+ 20| o o
? +
- 10| o o
+ 10| o o
? +
- 0| o o o
+ 0| o o o
? +
----------
B F E
u o n
s o t
i d e
n r
e t
s a
s i
n
m
e
n
- t
? -
+ t : Expected different chart representation. Check that all spacing is exact.