def search_for_vowels():

[Dixon]

def search4vowels(word):
    vowels = set('aeiou')
    found = vowels.intersection(set(word))
    for vowel in found:
        print(vowel)

Gives a Traceback name error when trying to invoke: "name 'search4vowels' not defined. This came from 'Head First Python'. And I know, using numbers in the function name isn't the best practice. It's the way it is in the book.

[micseydel]

The code you've provided defines a function. It doesn't do anything else. Barring a SyntaxError, you're not really going to get errors from just defining a function. Please provide your full code, that actually produces (I expect) a NameError. If your full code is long (>10 lines) I highly suggest you simplify your code until it's as simple as possible while reproducing your issue.

[Dixon]

The code you've provided defines a function. It doesn't do anything else. Barring a SyntaxError, you're not really going to get errors from just defining a function. Please provide your full code, that actually produces (I expect) a NameError. If your full code is long (>10 lines) I highly suggest you simplify your code until it's as simple as possible while reproducing your issue.

I know it defines a function. When I call it with a word it gives the error.

[Clunk_Head]

I know it defines a function. When I call it with a word it gives the error.

I copied your function into the Idle shell and called it and it ran perfectly.

def search4vowels(word):
    vowels = set('aeiou')
    found = vowels.intersection(set(word))
    for vowel in found:
        print(vowel)

word = "Hello"
search4vowels(word)

I suggest that your problem is in how or where you are calling it.

Please provide the calling code.

[micseydel]

Clunk_Head was quite clear, but I want to make sure you understand: we're not asking for this out of a whim, we want to help you and you haven't helped us enough to do so. We really do want to help, but we can't do so without what we're asking for.

[Dixon]

Yes, it works for me too now. I must have called it improperly yesterday. Thanks for the responses guys.

[DeaD_EyE]

Gives a Traceback name error when trying to invoke: "name 'search4vowels' not defined.

This happens if you call your function, before it's defined.

Example:

foo() # <- NameError!


def foo():
    pass

Error:
NameError: name 'foo' is not defined

This works:

def foo():
    pass


foo() # <- Name exists and points to the memory address, where the function lives

---

By the way, your code works:

In [2]: def search4vowels(word):
   ...:     vowels = set('aeiou')
   ...:     found = vowels.intersection(set(word))
   ...:     for vowel in found:
   ...:         print(vowel)
   ...:

In [3]: search4vowels('Hello World')
o
e

In [4]: