Ad:

Python Discussion Thread
Marked Solved
Views: 366218

Page 1
2
3
Next

You are currently viewing page 1 of this multi-page discussion thread

Oct 12th, 2004

How to do Input in Python?

Expand Post »

I've skimmed the manual and cant find the answer to this anywhere:

In basic, to add an Input function you would do (for example):

Python Syntax (Toggle Plain Text)

Input "What is your name? " name$

How do I do this in Python?

Last edited by Cup of Squirrel; Oct 12th, 2004 at 2:22 pm. Reason: Whoops. I put Perl instead of Python in title

Cup of Squirrel

Reputation Points: 11

Solved Threads: 1

Junior Poster

Offline

133 posts
since Oct 2004

Permalink

Oct 12th, 2004

Re: How to do Input in Python?

According to my trusty Python Pocket Reference, it's the input() function:

Python Syntax (Toggle Plain Text)
input([Prompt])
input([Prompt])

Where [ Prompt ] is the string you would want to prompt the user with, obviously. So, from what I can tell:

Python Syntax (Toggle Plain Text)
foo=input('Please enter a value:')
foo=input('Please enter a value:')

I'm rusty, but I think that would print Please enter a value:, and assign the user input to the variable foo. Or, some combination of that should work. Like I said, I'm kind of rusty, but plan on jumping back in to Python Real Soon Now...

alc6379

Team Colleague

Reputation Points: 186

Solved Threads: 147

Cookie... That's it

Offline

2,519 posts
since Dec 2003

Permalink

Nov 12th, 2004

Re: How to do Input in Python?

the correct way is

Python Syntax (Toggle Plain Text)
var = raw_input("Enter something: ")
print "you entered ", var
var = raw_input("Enter something: ")
print "you entered ", var

using input is unsafe as it evaluates your python code as commands and can cause someone to hack your code.

DrLight

Reputation Points: 14

Solved Threads: 1

Newbie Poster

Offline

2 posts
since Nov 2004

Permalink

Dec 2nd, 2004

Re: How to do Input in Python?

Quote originally posted by DrLight ...

the correct way is
Python Syntax (Toggle Plain Text)
var = raw_input("Enter something: ")
print "you entered ", var
var = raw_input("Enter something: ") print "you entered ", var
using input is unsafe as it evaluates your python code as commands and can cause someone to hack your code.

I didn't know that! You've at least enlightened two people.

Just out of curiosity, what does raw_input() do different from input()? Does it escape out everything, like !'s, /'s, and such? Or, do something to where they couldn't define/change other variables with their input? Am I close?

alc6379

Team Colleague

Reputation Points: 186

Solved Threads: 147

Cookie... That's it

Offline

2,519 posts
since Dec 2003

Permalink

Dec 2nd, 2004

Re: How to do Input in Python?

Quote originally posted by alc6379 ...

I didn't know that! You've at least enlightened two people.

Just out of curiosity, what does raw_input() do different from input()? Does it escape out everything, like !'s, /'s, and such? Or, do something to where they couldn't define/change other variables with their input? Am I close?

raw_input accepts your input as a string. input accepts it as a command. so for example lets say you had

Python Syntax (Toggle Plain Text)
input("somehthing")
input("somehthing")

and a hacker knowing some exploit in your code or system used the python function

Python Syntax (Toggle Plain Text)

eval

which basically evaluates a string as a command. you wouldn't want that. I had some code lying around here somewhere when i was testing it out, i'll try and find it for you.
For now just remeber to use only raw_input, if its imperitive to have a num then simply

Python Syntax (Toggle Plain Text)
int(input)
int(input)

should do the trick.

DrLight

Reputation Points: 14

Solved Threads: 1

Newbie Poster

Offline

2 posts
since Nov 2004

Permalink

Jan 19th, 2005

Re: How to do Input in Python?

Quote originally posted by Cup of Squirrel ...

I've skimmed the manual and cant find the answer to this anywhere:

In basic, to add an Input function you would do (for example):
Python Syntax (Toggle Plain Text)
Input "What is your name? " name$
Input "What is your name? " name$
How do I do this in Python?

From what I understand you would use, input as to prompt the user to input a number and raw_input to prompt a string

reezin14

Reputation Points: 12

Solved Threads: 4

Junior Poster

Offline

107 posts
since Jan 2005

Permalink

Mar 30th, 2005

Re: How to do Input in Python?

The correct answer is from
http://www.daniweb.com/techtalkforums/thread20774.html

Python Syntax (Toggle Plain Text)
# raw_input() reads every input as a string
# then it's up to you to process the string
str1 = raw_input("Enter anything:")
print "raw_input =", str1
 
# input() actually uses raw_input() and then tries to
# convert the input data to a number using eval()
# hence you could enter a math expression
# gives an error if input is not numeric eg. $34.95
x = input("Enter a number:")
print "input =", x
# raw_input() reads every input as a string
# then it's up to you to process the string
str1 = raw_input("Enter anything:")
print "raw_input =", str1

# input() actually uses raw_input() and then tries to
# convert the input data to a number using eval()
# hence you could enter a math expression
# gives an error if input is not numeric eg. $34.95
x = input("Enter a number:")
print "input =", x

vegaseat

Moderator

Reputation Points: 1333

Solved Threads: 1403

DaniWeb's Hypocrite

Offline

5,792 posts
since Oct 2004

Permalink

Jun 13th, 2005

Re: How to do Input in Python?

I have another problem with pythons Input, and I was wondering if someone could help me. Whenever I get any input from the user, python keeps printing out on a new line.
So for example:

test = raw_input ("Input word")
print "Why "+ test +" there a line break all the time?"

So if my inputted word was "is", the program would output this:

Why is
there a line break all the time?

Im guessing its because python is including the ENTER key used whenever I'm finished with input, but I'm not sure how to stop that. Any help would be appreciated.

Rete

Reputation Points: 10

Solved Threads: 1

Newbie Poster

Offline

23 posts
since Jun 2005

Permalink

Jun 13th, 2005

Re: How to do Input in Python?

Just a moment ...

I can't repeat your problem, both PythonWin and IDLE give a perfect one line result!

I tried to mimic your predicament ...

Python Syntax (Toggle Plain Text)
test = raw_input ("Input word")
print "Why "+ test +" there a line break all the time?"
 
# add a newline to the end for testing
test = test + '\n'
print "Why "+ test +" there a line break all the time?"
 
# simple way to remove a trailing newline
if '\n' in test:
    test = test[:-1]
print "Why "+ test +" there a line break all the time?"
test = raw_input ("Input word")
print "Why "+ test +" there a line break all the time?"

# add a newline to the end for testing
test = test + '\n'
print "Why "+ test +" there a line break all the time?"

# simple way to remove a trailing newline
if '\n' in test:
    test = test[:-1]
print "Why "+ test +" there a line break all the time?"

Last edited by vegaseat; Apr 26th, 2010 at 8:21 am. Reason: changed code tags

vegaseat

Moderator

Reputation Points: 1333

Solved Threads: 1403

DaniWeb's Hypocrite

Offline

5,792 posts
since Oct 2004

Permalink

Oct 22nd, 2007

Re: How to do Input in Python?

Click to Expand / Collapse Quote originally posted by Rete ...

I have another problem with pythons Input, and I was wondering if someone could help me. Whenever I get any input from the user, python keeps printing out on a new line.
So for example:

test = raw_input ("Input word")
print "Why "+ test +" there a line break all the time?"

So if my inputted word was "is", the program would output this:

Why is
there a line break all the time?

Im guessing its because python is including the ENTER key used whenever I'm finished with input, but I'm not sure how to stop that. Any help would be appreciated.

Looks like a funny issue, I couldn't re - produce it. But Ican suggest you the solution.

try this,

print "Why "+ test.strip() +" there a line break all the time?"

It has to work out, strip will help you to remove the newline charecter from test

tharippala

Reputation Points: 10

Solved Threads: 1

Newbie Poster

Offline

2 posts
since Oct 2007

Page 1
2
3
Next

This thread is solved

Either the thread starter or a moderator has marked this thread as solved. You can most likely trust the responses and answers given. There is most likely no reason for any further responses to be posted here. If you have a related question, please start a new thread in this forum instead.

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

This thread is currently closed and is not accepting any new replies.

Previous Thread in Python Forum Timeline: Repetitive code problem

Next Thread in Python Forum Timeline: grab mouse and key input outside of python window

DaniWeb Message

Cancel Changes

User Name
Password