Is there something about the os module I'm not getting?

For the last half hour I've been trying to figure out what is wrong with this code. It should be very straight forward. I've practically copied it out of the documentation at this point. But no matter what I try I receive a syntax error.

Here's the code:

def addfiles(folder):
    foldercont = [os.path.normcase(f) for f in os.listdir(folder)]
    for x in foldercont:
        if os.path.isfile(x) == True:
            files.append(os.path.realpath(x)
        if os.path.isdir(x) == True:
            addfiles(os.path.realpath(x))

Whenever I run this, i receive the error

 if os.path.isdir(x) == True:
                           ^
 SyntaxError: invalid syntax

However, if I write the equivlent code in the interactive interpreter it runs fine.

Can this method simply not be used in an if loop or something?

Th开发者_开发百科anks for the help. I'm getting really frustrated at this point... heh.

---

There's a parenthesis missing at this line:

files.append(os.path.realpath(x)
                                ^

Python complains about the True: bit because it's expecting a statement like

(x if condition else y)

As jcomeau_ictx says, you should also leave out the == True when checking for booleans:

if x:
    do_something
if not y:
    do_something_else

---

you're missing a close parentheses on the previous line.