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How to do Input in Python?

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How to do Input in Python?

Oct 12th, 2004

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):

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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

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Re: How to do Input in Python?

Oct 12th, 2004

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

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input([Prompt])
input([Prompt])

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

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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...

Alex Cavnar, aka alc6379

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Re: How to do Input in Python?

Nov 12th, 2004

the correct way is

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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.

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Re: How to do Input in Python?

Dec 2nd, 2004

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Originally Posted by DrLight

the correct way is
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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?

Alex Cavnar, aka alc6379

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Re: How to do Input in Python?

Dec 2nd, 2004

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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

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input("somehthing")
input("somehthing")

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

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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

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int(input)
int(input)

should do the trick.

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Re: How to do Input in Python?

Jan 19th, 2005

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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):
Help with Code Tags

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

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Re: How to do Input in Python?

Mar 30th, 2005

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

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# 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

May 'the Google' be with you!

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Re: How to do Input in Python?

Jun 13th, 2005

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.

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Re: How to do Input in Python?

Jun 13th, 2005

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 ...
[php]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?"
[/php]

May 'the Google' be with you!

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Re: How to do Input in Python?

#10

Oct 22nd, 2007

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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