How to add function output to string literal in Python?

Question

I'm new to Python. Just putting that out there.

What I want to do is to add the output of a function to a string literal that another function outputs.

This is the case:

**

def prime(n):
    **blahh blah blah....**
    if z == True:
        return " and prime"
    else:
        return ""
def happyPrime(n):
     **more blah blah blah**
            if n == 1:
                print ("Number is happy%s!" % prime)
                break
            if n in visited:
                print ("Number is sad%s!" % prime)
            visited.add(n)

[Ignore the indentations in the code snippet, StackOverflow made them come out wrong.] The intended result is, of course, that where the modulo is it adds what the other function returned. I think I may be approaching it the wrong way, though.

You should use prime(n) instead of just prime; print ("Number is happy%s!" % prime(n)). — Ashwini Chaudhary
– Ashwini Chaudhary, Commented May 11, 2013 at 17:52

Thanakron Tandavas · Accepted Answer · 2013-05-11 18:26:55Z

1

Here:

def happyPrime(n):
     **more blah blah blah**
            if n == 1:
                print ("Number is happy%s!"  %  prime(n))
                break
            if n in visited:
                print ("Number is happy%s!"  %  prime(n))
            visited.add(n)

Your prime(n) function returns a string. So, %s will be replaced with the returned string.

Alternatively, you can just concatenate the returned string. For example :

>>> def foo(n):
        if n == True:
            return "yay"
        else:
            return "boo"

>>> def happyPrime(n):
        print "bar " + foo(n)

>>> happyPrime(True)
bar yay

>>> happyPrime(False)
bar boo

edited May 11, 2013 at 18:26

answered May 11, 2013 at 17:51

Thanakron Tandavas

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4 Comments

Gareth Latty Over a year ago

It's worth noting the Python docs recommend the newer str.format() over the old % string formatting.

Thanakron Tandavas Over a year ago

@Lattyware Thank you for pointing that out. I should have read the Python docs more carefully.

Gareth Latty Over a year ago

@ThanakronTandavas It's not a huge problem - % style formatting isn't even deprecated yet (although that might happen at some point), but it's probably a good idea to get into the habit of using the new style formatting. It's more powerful and easier to read.

Thanakron Tandavas Over a year ago

@Lattyware Couldn't agree with you more. I will stick to str.format() then.

Senjai · Accepted Answer · 2013-05-11 17:51:06Z

0

Not sure quite what you mean, if you want %s to return the result of prime(n) you have to give prime an argument because it expects one. from the looks of it, either True or False.

print ("number is happy%s!" % prime(True))

answered May 11, 2013 at 17:51

Senjai

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