can not change double to single dash

[wavic]

Yes in the variable you see it as '\\' but it is '\' when you print it. Just like the new line character. It has no graphical representation as the letters for example so we use '\n' to deal with it. And because the single backslash is an escape character we have to escape it with another one. So:

s = '\\no \\new line here'
print(s)

Output:
\no \new line here

But see this:

print(len(s))

Output:
18

If you count the characters in the string you will get 20 but as you can see the output they are 18. '\\' is a representation of '\'. For our convenience.