How do i read a specific line of text from a file and use it as a parameter for a function

Question

I am working on a Python script ( 2.7 ) that will take a line of text from a text file and use it as a parameter for a function but i can not seem to figure out how to pass the line as a parameter for the function I also was wondering how would i modify a line that already exists in a file without opening it using a text editor within Python

#!/usr/bin/python
data = open("/tmp/INFO.txt", 'r')
Line = data.readlines()[2]
print Line

Answer 1

To get the specific line:

f = open("yourFile.txt", "r")
line = f.readlines()[yourLineNumber]
f.close()

To pass it as a parameter:

yourFunction(line)

Answer 2

To read a specific line and use it as a parameter, you first need to open the file then read the contents.

with open(filePath, 'r') as fd:
    fileContents = fd.readlines()

Then you can can call fileContents[n] where n is the index of the line you need.