How do you read from stdin?

python stdin
tehryan picture tehryan · Sep 20, 2009 · Viewed 1.7M times · Source

I'm trying to do some of the code golf challenges, but they all require the input to be taken from stdin. How do I get that in Python?

Answer

u0b34a0f6ae picture u0b34a0f6ae · Sep 21, 2009

You could use the fileinput module:

import fileinput

for line in fileinput.input():
    pass

fileinput will loop through all the lines in the input specified as file names given in command-line arguments, or the standard input if no arguments are provided.

Note: line will contain a trailing newline; to remove it use line.rstrip()

Related questions

How to open every file in a folder?

I have a python script parse.py, which in the script open a file, say file1, and then do something maybe print out the total number of characters. filename = 'file1' f = open(filename, 'r') content = f.read() print filename, …

Read More
How do I pass a string into subprocess.Popen (using the stdin argument)?

If I do the following: import subprocess from cStringIO import StringIO subprocess.Popen(['grep','f'],stdout=subprocess.PIPE,stdin=StringIO('one\ntwo\nthree\nfour\nfive\nsix\n')).communicate()[0] I get: Traceback (most recent call last): File "<stdin>", line 1, …

Read More
sys.stdin.readline() reads without prompt, returning 'nothing in between'

I have a function that executes the following (among other things): userinput = stdin.readline() betAmount = int(userinput) Is supposed to take input integer from stdin as a string and convert it to an integer. When I call the function, however, …

Read More