随机调用函数执行

Question

I have made this short questionnaire:

from random import randint

def pancakes():
    q = raw_input("Do you like pancakes?")
    if q == "yes":
        print("Great!")
    elif q == "no":
        print("Hmmm...")

def french_toast():
    q = raw_input("Do you like french toast?")
    if q == "yes":
        print("Oh!")
    elif q == "no":
        print("Same here!")

def random():
    num = 2
    while num > 0:
        random = randint(1, 2)
        if random == 1:
            num = num -1
            pancakes()
         elif random == 2:
             num = num -1
             french_toast()

random()

My goal here was to get the questions in a random order. But sometimes the same question will be asked twice since it's randomly chosen.

So how can I make it ask the same question only once?

Answer 1

Instead of a while loop, I'd suggest you use a for loop in conjunction with random.sample . Create a list of functions before-hand to provide to sample :

from random import sample

funcs = [french_toast, pancakes]
for func in sample(funcs, len(funcs)):
    func()

this will now loop through all functions randomly selecting a function in each iteration.

Alternatively, you could shuffle the list (performs in-place) with random.shuffle and then iterate through it, that will be faster too (though, speed shouldn't be the biggest concern here):

from random import shuffle

funcs = [french_toast, pancakes]
shuffle(funcs)
for func in funcs:
    func()

Put these in a function if so required:

from random import shuffle

# use *funcs for passing arbitrary number of 
# functions as positional arguments.
def call_funcs_randomly(funcs):
    shuffle(funcs)
    for func in funcs:
        func()

and call them:

call_funcs_randomly([french_toast, pancakes])

---

As a comment noted, don't use random as a function name, it has the possibility of masking the module random leading to odd looking errors.

Answer 2

I would use random.sample Link . Just create a list of indices to your questions and sample 2 of them.

EDIT:

additionally, you could use random.shuffle Link :

random.shuffle(questions)
for question in questions:
    # process your random question once 

Answer 3

how about this for your last question ( random is not a good name! you might overwrite the module of the same name [although you are fine the way do do it right now])

def random_questions():
    eligible_questions = [pancakes, french_toast]
    while eligible_questions:
        question = random.choice(eligible_questions)
        eligible_questions.remove(question)
        question()

put the questions in a list, select one with random.choice , remove it from the list and execute it. stop if the question list is empty. this way every question is selected exactly once.

this is easily extended if you want to add more questions.

on second thought: the shuffle version in Jim Fasarakis-Hilliard's answer is a lot cleaner!