等概率抽样

ran.py

import random

def get_ran(m, n):
    for i in range(n):
        if(random.randint(0, n-i-1) < m):
            print(i, end="")
            m -= 1
    print()

if __name__ == "__main__":
    for _ in range(200):
        get_ran(2, 5)