NameError: Name 'now' Is Not Defined

From this source code: def numVowels(string): string = string.lower() count = 0 for i in range(len(string)): if string[i] == 'a' or string[i] == 'e' or string[i

Solution 1:

Use raw_input() instead of input().

In Python 2, the latter tries to eval() the input, which is what's causing the exception.

In Python 3, there is no raw_input(); input() would work just fine (it doesn't eval()).

Solution 2:

use raw_input() for python2 and input() in python3. in python2, input() is the same as saying eval(raw_input())

if you're running this on the command line, try $python3 file.py instead of $python file.py additionally in this for i in range(len(strong)): I believe strong should say string

but this code can be simplified quite a bit

def num_vowels(string):
    s = s.lower()
    count = 0
    for c in s: # for each character in the string (rather than indexing)
        if c in ('a', 'e', 'i', 'o', 'u'):
            # if the character is in the set of vowels (rather than a bunch
            # of 'or's)
            count += 1
    return count

strng = input("Enter a statement:")
print("The number of vowels is:", num_vowels(strng), ".")

replacing the '+' with ',' means you don't have to explicitly cast the return of the function to a string

if you'd prefer to use python2, change the bottom part to:

strng = raw_input("Enter a statement: ")
print "The number of vowels is:", num_vowels(strng), "."