I have this python code
while 1:
exec(input())
when I enter import os \nos.system("echo 1") I get this error
File "<string>", line 1
import os \nos.system("echo 1")
^
SyntaxError: unexpected character after line continuation character
The problem is that you're using \n within the exec, which as @The Thonnu mentioned causes problems when parsing.
Try entering import os; os.system("echo 1") instead.
Semicolons can be used in Python to separate different lines as an alternative to semicolons.
If you must use \n in your input, you can also use:
while 1:
exec(input().replace('\\n', '\n'))
When you enter the line:
import os \nos.system("echo 1")
In Python, this string actually looks like this:
import os \\nos.system("echo 1")
Because it's trying to treat your input as literally having a \, which requires a \\. It doesn't treat your \n as a newline.
You could remove the escape yourself:
cmd = input()
exec(cmd.replace("\\n", "\n"))
exec reads the \n as a backslash and then n ('\\n') not '\n'.
A backslash is a line continuation character which is used at the end of a line, e.g.:
message = "This is really a long sentence " \
"and it needs to be split across mutliple " \
"lines to enhance readibility of the code"
If it recieves a character after a backslash, it raises an error.
You can use a semicolon to indicate a new expression:
import os; os.system("echo 1")
Or, replace the '\n's in your code:
exec(input().replace('\\n', '\n'))
