Len() function for special characters inPython

Here is a code

x = “\\”

The output is 2 ,where as I thought it would be 4 as there are four characters…Can someone please explain why it is 2

x = "\"

This code gives SyntaxError: EOL while scanning string literal
Someone please exlain why this gives error

When I post this question it turns 4 back slashes into 2 and also turns 3 backslashes into 1 …I don’t know why