How can I find in Python there was \n or \t in input

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Python3.6

I want to understand have it been \n in input or not
ex: if "hello \n hru" print true
else print false
totally I want to know python how to read \ and \n ..

I=0 
if s[I]=="\" and s[I+1]==\n ...

it s not correct
i dont know how to solve it !!!!

What I have tried:

s="salam\n"
i=len(s)
print(i)
if (s[i-1] ==" " and s[i-2]==' '):
    print(1==1)
    print(i-1)