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#!/usr/bin/python2.7

s = "hello world! Hello world"

## find

assert s.find("wor") == 6 # only first occurance

assert s.find("nemo") == -1

all_wor = []

pos = -1

while True:

pos = s.find("wor", pos+1)

if pos == -1:

break

all_wor.append(pos)

assert all_wor == [6, 19]

## rfind

all_wor = []

pos = len(s)+1

while True:

pos = s.rfind("wor", 0, pos-1)

if pos == -1:

break

all_wor.append(pos)

assert all_wor == [19, 6]

## index/rindex - same as find/rfind, but raises ValueError on failure

## count

assert s.count("w") == 2

assert s.count("z") == 0

assert "aaaaaa".count("aa") == 3 # no overlapping

## replace

assert s.replace("world", "World") == "hello World! Hello World"

assert s.replace("world", "World", 1) == "hello World! Hello world"