Why does my .find() function keep throwing up an error? [duplicate]

You cannot search directly through a file for a String; you must first convert to a string. Also, you are opening the file in a mode, which is write-only, so try something like this:

C1 = open("Class1.txt","r")
dataList = C1.readlines()
data = ""
for line in dataList:
    data += line

# do stuff with data, which is a string

Other Notes:

I do not recommend having a space in your file name; rename it to Class.txt as in my example.

To .find(something), something must be a string, like: data.find("S_N")

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