[Tutor] Invalid Token Problem

[Osemeka Osuagwu]

Hi folks,
I've been trying to convert numbers from digits to words, I wrote the
following code;


units = ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight',
'nine']
teens = ['eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen',
'seventeen', 'eighteen', 'nineteen']
tens = ['ten', 'twenty', 'thirty', 'fourty', 'fifty', 'sixty', 'seventy',
'eighty', 'ninety']

def num2word(num):
    wordlist = []
    if len(str(num)) == 4:
        wordlist = [units[1] + 'thousand']

    if len(str(num)) == 3:
        if num%100 == 0:
            wordlist = [units[eval(str(num)[-3])-1] + 'hundred']
        else:
            wordlist = [units[eval(str(num)[-3])-1],'hundred', 'and',
num2word(eval(str(num)[-2:]))]

    if len(str(num)) == 2:
        if num%10 == 0:
            wordlist = [tens[eval(str(num)[-2])-1]]
        elif 10<eval(str(num))<20:
            wordlist = [teens[eval(str(num)[-1])-1]]
        else:
            wordlist = [tens[eval(str(num)[-2])-1],
units[eval(str(num)[-1])-1]]

    if len(str(num)) == 1:
        wordlist = [units[num-1]]
    return ' '.join(wordlist)

for i in range(1, 200):
    print i, num2word(i)


but when I let it run till i = 108, it gives me an invalid token error as
follows;

...
99 ninety nine
100 onehundred
101 one hundred and one
102 one hundred and two
103 one hundred and three
104 one hundred and four
105 one hundred and five
106 one hundred and six
107 one hundred and seven
108

Traceback (most recent call last):
  File "C:/Windows.old/Users/Abasiemeka/Abasiemeka/GOOGLE
University/Python/Python Code/MyCode/Project Euler code/Project Euler
answer 17.py", line 33, in <module>
    print i, num2word(i)
  File "C:/Windows.old/Users/Abasiemeka/Abasiemeka/GOOGLE
University/Python/Python Code/MyCode/Project Euler code/Project Euler
answer 17.py", line 18, in num2word
    wordlist = [units[eval(str(num)[-3])-1],'hundred', 'and',
num2word(eval(str(num)[-2:]))]
  File "<string>", line 1
    08
     ^
SyntaxError: invalid token
>>>


I am at a loss, please help.

gratefully,
Abasiemeka
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