Python3x Integer and String Input

Question

I want the user to input a number Give a number : he types "10" -but... Give a number : he types "I want to type 10" i want the program to just "count" the integer. Because if he types a string the program will stop

import random
goal = random.randrange(1,10)
n = 1 
tries = 0 
name = input("Dose to onoma sou ")

print("A game in Python")
while n != 0 : 
    value = int(input("madepse poio einai to noumero:")) 
    n = abs(value - goal)
    print(value,n)
    tries = tries + 1
    if n >= 4 :
     print("den eisai koda")
    elif n > 0 and n <= 3 :
     print("eisai koda")
    else :
     print("to vrikes")
     print ("to score sou einai: ",tries)

skoros = str(tries)
score = open('score.txt', 'a')
score.write(name)
score.write(' ') 
score.write(skoros)
score.write("\n") 
score.close

oh yea but i just tried and without () and it works is there any difference ?. the truth is i forgot the () but i got no error ":S — Portgas D Ace
– Portgas D Ace, Commented Nov 1, 2015 at 19:34
It gets no error because it is just a value. It's like have a line like 1 instead of x=1. You won't get an error but it doesn't actually do anything. — Mark Tolonen
– Mark Tolonen, Commented Nov 1, 2015 at 20:49

Mark Tolonen · Accepted Answer · 2015-11-01 20:54:46Z

1

This will take any input and pull the first number out of it. \d matches any digit 0-9, and + means "one or more".

import re

while True:
    user = input('Enter a number: ')
    match = re.search(r'\d+',user)
    if match:
        value = int(match.group(0))
        break
    else:
        print("I didn't see a number in that response.")

print(value)

edited Nov 1, 2015 at 20:54

answered Nov 1, 2015 at 19:18

Mark Tolonen

181k26 gold badges182 silver badges278 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Portgas D Ace Over a year ago

so there is no way just to accept the users answer ? i want to keep the integer from his answer. "my answer is 10" i want the program to keep the 10 and not break. i want to extract the integer from his answer

Portgas D Ace Over a year ago

i get the error module re has no attribute search (its for phython3x)

Mark Tolonen Over a year ago

I wrote The code on Python 3. It's a standard library method.

xXliolauXx · Accepted Answer · 2015-11-01 19:58:20Z

0

Well, you could just manually loop through the string and store the position of the number using isdigit().

The following approach expects the number to be the only one in the string (multi digit allowed):

start = None
stop = None
for i in range(len(input)):
    c = input[i]
    if c.isdigit():
        if start == None:
            start = i
        stop = i
try:
    number = int(input[start:stop])
catch:
    print("invalid input")

EDIT: I guess there would be some nice and easy Regex solution, but I'll leave my hands off of it, as I am not too experienced with it...

answered Nov 1, 2015 at 19:58

xXliolauXx

1,3131 gold badge11 silver badges25 bronze badges

3 Comments

Portgas D Ace Over a year ago

what about the re module ? i just dont how the syndax of re module

xXliolauXx Over a year ago

@D Ace For re, see Marks answer, which I would suggest to use.

Portgas D Ace Over a year ago

well it looks fine and i get the logic of his answer but i get an error maybe i still do something wrong

Collectives™ on Stack Overflow

Python3x Integer and String Input

2 Answers 2

3 Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related