Running a python script with inputs from within Jupyter Notebook

Question

I have created the following Python script named week1_1.py:

import sys
input = sys.stdin.read()
tokens = input.split()
a = int(tokens[0])
b = int(tokens[1])
print(a + b)

However, when I call it from within my Jupyter Notebook I get the following exception:

%run -i week1_1 2 3

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
D:\Mint_ns\week1_1.py in <module>()
      8 input = sys.stdin.read()
      9 tokens = input.split()
---> 10 a = int(tokens[0])
     11 b = int(tokens[1])
     12 print(a + b)

IndexError: list index out of range

What might be the cause of this exception?

What does print(tokens) or print(len(tokens)) show? tokens is probably an empty list. — Joel
– Joel, Commented Aug 15, 2018 at 1:33

burgerhex · Accepted Answer · 2018-08-15 01:42:10Z

1

To get user input in Jupyter Notebook, use input() (or raw_input() for Python 2):

Hope this helps!

answered Aug 15, 2018 at 1:42

burgerhex

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pwxcoo · Accepted Answer · 2018-08-15 01:44:45Z

1

input_str = input()
tokens = input_str.split()
a = int(tokens[0])
b = int(tokens[1])
print(a + b)

ouput:
1 2
3

you can use input() to replace sys.stdin.read().

Why you cannot use sys.stdin.read()? the sys.stdin.read() will read stdin until it hits EOF. So I guess when you run it in jupyter notebook, it will read EOF when you run the cell.(I am not sure.)

But input() will run normallly in jupyter notebook. I recommend you to use input() rather than sys.stdin.read() when get keyboard input.

edited Aug 15, 2018 at 1:44

answered Aug 15, 2018 at 1:39

pwxcoo

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Comments

jh314 · Accepted Answer · 2018-08-15 01:37:44Z

0

A simpler way is to use raw_input instead of stdin.read:

tokens = raw_input().split()
a = int(tokens[0])
b = int(tokens[1])
print(a + b)

answered Aug 15, 2018 at 1:37

jh314

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Comments

U13-Forward · Accepted Answer · 2018-08-15 02:24:34Z

0

OR:

print(sum(int(i) for i in input().split()))

Example output:

1 1
2

answered Aug 15, 2018 at 2:24

U13-Forward

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