如何仅从txt文件打印一行？ （蟒蛇）

Question

Im trying to create a program which only reads/prints a certain line in python. So far i have got this:

import random
import time
a = open("settings.txt", "r")
b = open("settings.txt", "a")
adding = input("Enter Name: ")
with open("settings.txt", "a") as f:
     f.write("\n{}".format(adding))
data = [line.rstrip() for line in a.readlines()]
print(", ".join(data))
time.sleep(10)

In my settings.txt:

Blah 1 
Blah 2
Blah 3

How do I only get the program to print (for example) Blah 1 and nothing else from that txt file?

Answer 1

The following opens up the file for you, prints the first line, and then closes it:

with open("settings.txt", "r") as f:
    print f.readline()

Answer 2

If it is just the first line, you could do:

for line in open('afile.txt'):
    print line
    break

If it is a random line that you want, you could do:

from random import choice
print choice(list(open('afile.txt')))