No for, no if
Categories: [ IT ]
The mission: write a program that iterates over a list and asks the user, on every item, if he wants to change the current number, or quit (and keep the rest of the list unchanged).
Here's a possible python implementation.
def loop(data, index):
return decide(index == len(data) - 1,
lambda: quit(data),
lambda: run(data, index+1)
)
def decide(condition, iftrue, iffalse):
return (iffalse, iftrue)[condition]()
def choose(selector, choices, default):
return choices.get(selector, default)()
def change(data, index, new_value):
data[index] = new_value
return loop(data, index)
def run(data, index):
print data[index]," Change? [n/q/]",
reply = raw_input()
return choose(reply.lower(),
{
"n": lambda: loop(data, index),
"q": lambda: quit(data)
},
lambda: decide(reply.isdigit(),
lambda: change(data, index, int(reply)),
lambda: run(data, index)
)
)
def quit(data):
return data
data = range(10)
print run(data, 0)
[ Posted on March 21st, 2009 at 18:09 | 2 comments | permanent link ]
