A problem with list

[Steven Bethard]

Tim Henderson wrote:
> def tokenizer(str, chr=' '): #heres a useful tool just like 
> StringTokenizer feature in Java
>    if chr != '': chr = chr[0]
>    else: chr = ' '
>    x = ""
>    tokens = [""]
>    z = 0
>    for x in str:
>        if x != chr:
>            tokens[z] = tokens[z] + x
>        else:
>            z = z + 1
>            tokens.append("")
>    return tokens

Maybe I don't understand your intent here, but why don't you just use 
the builtin str.split?

 >>> tokenizer('abc de fgh')
['abc', 'de', 'fgh']
 >>> 'abc de fgh'.split()
['abc', 'de', 'fgh']
 >>> 'abc.de.fgh'.split('.')
['abc', 'de', 'fgh']

> list = ['abc', 'def', 'xyz']
> str = ''
> for x in list:
>    str+=list+'.'

A loop with += on strings is generally an inefficient way to go.  You 
would do better with something like:

 >>> lst = ['abc', 'def', 'xyz']
 >>> '.'.join(lst)
'abc.def.xyz'

Steve