Concatenation

[pyn00b]

After getting raw_input from the user, I want to print a sentence that ends in an integer and then the "." character. Of course, if I print using a comma (,) I don't get an error but there is an ugly space between the integer and the period. But if I try "+" then I obviously get a str/int concatenation error.

One way to solve this is to convert the int into a str and then "+" works. But is there an easier way without having to call the str() method?

[numberwhun]

After getting raw_input from the user, I want to print a sentence that ends in an integer and then the "." character. Of course, if I print using a comma (,) I don't get an error but there is an ugly space between the integer and the period. But if I try "+" then I obviously get a str/int concatenation error.

One way to solve this is to convert the int into a str and then "+" works. But is there an easier way without having to call the str() method?

Um, what language are you working in?

[pyn00b]

Um, what language are you working in?

Python. So here is some code...

num = raw_input("Pick a number: ")
num = int(num)
print "Your number times 5 is", num * 5, "."

This produces a space between num and the period. If I try to use "+" I get an error trying to concatenate a str and int. It's possible to print str(num) and then concatenate that result with the period to eliminate the space. But I was wondering if there was a more obvious way than calling the str() function.

[Ganon11]

Moved the thread to the Python forum.

[pyn00b]

Moved the thread to the Python forum.

Thanks! Sorry about that. New here. :)

[dshimer]

And don't forget Code tags.

My favorite way (because there are several) is using string formatting.

>>> num = raw_input("Pick a number: ")
>>> num = int(num)
>>> print "Your number times 5 is %d."%(num * 5)
Your number times 5 is 30.
 

You could also move the int() call to tighten the code a little.

>>> num = int(raw_input("Pick a number: "))
>>> print "Your number times 5 is %d."%(num * 5)
Your number times 5 is 40.
 

or for that matter

print "Your number times 5 is %d."%(int(raw_input("Pick a number: ")) * 5)

Once you start worrying about what happens if the user enters a non numeric value like "a" you will want to explore the try: and except: block.

[jlm699]

num = raw_input("Pick a number: ")
num = int(num)
print "Your number times 5 is", num * 5, "."
 

This produces a space between num and the period. If I try to use "+" I get an error trying to concatenate a str and int. It's possible to print str(num) and then concatenate that result with the period to eliminate the space. But I was wondering if there was a more obvious way than calling the str() function.

So why not use the str() conversion? It's probably just as easy...

num = int(raw_input("Pick a number: "))
print "Your number times 5 is " + str(num * 5) + "."
 

I guess it's a matter of preference, but that's how I do all my string/int concatenations...

[bvdet]

I try to avoid string concatenation where possible. String formating with %s uses str() to generate the string.

num = int(raw_input("Pick a number: "))
print "Your number times 5 is %s." % (num * 5)

[pyn00b]

dshimer, jlm699, and bvdet - thanks to you all for responding. That was very helpful and educational!