How to input an unknown size of strings with newlines in Python?

Question

I need input data from keyboard in console Python like this:

 1427  0   

   876652098643267843 
5276538

How can I catch them to array?

can you please explain the input? Are the input values space separated or are they in newlines? — astrosyam, Dec 18 '15 at 06:23
In one line can be any size of numbers and between numbers can be any size of spaces. Also I can input any size of empty lines between lines — Nursultan Aidarkulov, Dec 18 '15 at 06:29
the task is http://acm.timus.ru/problem.aspx?space=1&num=1001&locale=en — Nursultan Aidarkulov, Dec 18 '15 at 06:40
Do you really want to allow blank lines and terminate only on an actual EOF signal? — TigerhawkT3, Dec 18 '15 at 07:54

score 0 · Answer 1 · answered Dec 18 '15 at 07:10

0

Try this:

import fileinput

for line in fileinput.input():
    #your code
    print(line)

This will accept a stream of characters till EOF is encountered. (Cnrl + D)

You may then split the each line to obtain individual values.

answered Dec 18 '15 at 07:10

astrosyam

857
4
15

I think the OP was referring to EOF because that's how it's done in C++ and it's the only way he knows of. – TigerhawkT3 Dec 18 '15 at 07:12

score 0 · Answer 2 · answered Dec 18 '15 at 07:29

0

First you need to read the multiline data in Python. How to to this is described here: raw-input-across-multiple-lines-in-python

Once you have your input in a variable you process it.

Very simple example. Don't know if it meets the requirements from your task:

import math
sentinel = '#' 
result = []
all_data = iter(raw_input, sentinel)
for line in all_data:
    data = line.split(' ')
    for Ai in data:
        Ai = Ai.strip()
        try:
            result.append(math.sqrt(int(Ai)))
        except:
            pass

for i in reversed(result):
    print("%.4f"%i)

Now your task is to optimize.

answered Dec 18 '15 at 07:29

kotlet schabowy

918
1
7
18

Thank you too. this part of code will help me in future tasks) – Nursultan Aidarkulov Dec 18 '15 at 08:19
Have you noticed the accept answer button and "This answer is useful" buttons? :) – kotlet schabowy Dec 18 '15 at 09:53
Oo i have only 9 reputation. wait untill i will be 15)) – Nursultan Aidarkulov Dec 18 '15 at 10:38

score 0 · Accepted Answer · answered Dec 18 '15 at 08:39

If you like to send EOF and have the script process the data, you can use this code:

import math
import sys
result = []
for line in sys.stdin.readlines():
    data = line.split(' ')
    for Ai in data:
        Ai = Ai.strip()
        try:
            result.append(math.sqrt(int(Ai)))
        except:
            pass

for i in reversed(result):
    print("%.4f"%i)

On Windows you need to press CRTL + Z and then ENTER. You will see ^Z in the CMD shell. On Linux press CTRL + D.

How to input an unknown size of strings with newlines in Python?

3 Answers3