Problem in a python2 file

[buran]

Did you try the files on python2 ? My problem is on python2 since I cannot use python3 because python3 cannot import click.

yes, python2. that is why I say I have problem because you use input and not raw_input.
and as already explained to you several times - install click for python3 if you want to run it with python3

---

C:\>C:/Python27/python.exe c:/solver.py
solver.py  in python2.7
Resolve second degree equation. Enter the coefficients(numbers): a,b,c
 Are you ready: y/n ? y
('you entered:  ', 'y')
a 1
b 6
c 9
(-3.0, -3.0)
do you want to begin again for another equation ?
sylas
Do you agree ? y/n
We wiil continue
a s
Traceback (most recent call last):
  File "c:/solver.py", line 42, in <module>
    Solver().demo()
  File "c:/solver.py", line 13, in demo
    a = float(input("a "))
  File "<string>", line 1, in <module>
NameError: name 's' is not defined

Also note that it doesn't matter which version I use - if there is indentation error it will be the same in python2 and python3