Formatting, strings & characters:

basestring()

bin()

chr()

format()

hex()

oct()

ord()

print()

repr()

str()

unichr()

unicode()

Functional:

filter()

map()

reduce()

reversed()

sorted()

IO:

file()

input()

raw_input();

open()

Iterable, sequence and generator:

enumerate()

iter()

next()

range()

xrange()

zip()

Lang:

__import__()

callable()

compile()

dir()

eval()

execfile()

globals()

help()

locals()

reload()

vars()

Logic:

any()

all()

cmp()

Math:

abs()

complex()

min()

divmod()

max()

pow()

round()

sum()

Memory:

bytearray()

memoryview()

Object oriented:

classmethod()

isinstance()

staticmethod()

issubclass()

property()

super()

type()

Attribute management:

delattr()

getattr()

hasattr()

setattr()

Types:

id()

bool()

dict()

float()

frozenset()

hash()

int()

len()

list()

long()

object()

set()

slice()

tuple()

Non-essential Function:

apply()

buffer()

coerce()

intern()