title: merging multiple files in to a new file
body: <p>I have 2 text files, like ['file1.txt', 'file2.txt']. I want to write a Python script to concatenate these files into a new file, using basic functions like open() to open each file, read line by line by calling f.readline(), and write each line into that new file using f.write(). I am new to file handling programming in python. Can someone help me with this?</p>