Python user input replay

Question

How can I get the last raw_input? My py asks questions(raw_input) and if user types wrong asks the same again and user needs to type all over again, so how can I get last input to make de user just edit it??(like a shell pressing key-up)

Answer 1

You are looking for the readline module. Here's an example from effbot.org:

# File: readline-example-2.py

class Completer:
    def __init__(self, words):
        self.words = words
        self.prefix = None
    def complete(self, prefix, index):
        if prefix != self.prefix:
            # we have a new prefix!
            # find all words that start with this prefix
            self.matching_words = [
                w for w in self.words if w.startswith(prefix)
                ]
            self.prefix = prefix
        try:
            return self.matching_words[index]
        except IndexError:
            return None

import readline

# a set of more or less interesting words
words = "perl", "pyjamas", "python", "pythagoras"

completer = Completer(words)

readline.parse_and_bind("tab: complete")
readline.set_completer(completer.complete)

# try it out!
while 1:
    print repr(raw_input(">>> "))

Answer 2

Use the readline module.

import readline

# Everything magically works now!

There are more sophisticated features available if you want tab completion and other goodies.