Translation of "Coroutines in C" in Python

coroutine_example.py

#!/usr/bin/env python
"""Translation of "Coroutines in C" in Python

http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
"""

EOF = b''

def decompressor(getchar):
    for c in iter(getchar, EOF):
        if c == 0xFF:
            len = getchar()
            c = getchar();
            for _ in xrange(len):
                yield c
        else:
            yield c
    yield EOF


def parser(getchar):
    for c in iter(getchar, EOF):
        if isalpha(c):
            while 1:
                add_to_token(c)
                c = getchar()
                if not isalpha(c):
                    got_token(WORD)
                    break
        #NOTE: fall-through as in C code (even if EOF)
        add_to_token(c)
        got_token(PUNCT)

#USAGE: parser(iter(decompressor(lambda: sys.stdin.read(1)).next)