I want to read back a line from a specific line/string in python

Question

this is the code that has me really confused:

if search in open('test.txt').read():
    print("product is found")

i am trying to re-read a line fro my text file using the .read() function however i do not know how this would work from searching a single string. EG: if search is 12345 i want to find this in the text file and then output it on the shell. I have tried numerous different ways but cannot get it to work. This is for my work experience and would help me a lot.

Answer 1

If I understood you right, you want to get the line which matches the search . If so, you just need to read file line by line which can be done like this

for line in open('test.txt'):
    if search in line:
        print("Product is found on line", line.strip())