Use readline to read txt file python3

python python-3.x readline

a.readline() will return '' an empty string when no more data is available, you need to check that and then break your while, eg:

while True:    line = a.readline()    if not line:         break

If it's not purely for learning purposes then you really should be using a with statement and for-loop to process the file, line by line:

with open('SampleTxt.txt') as fin:    for line in fin:        pass # do something

It's more clear as to your intent, and by using the with block, the fileobj will be released on an exception or when the block ends.

CodeHunter