Python - creating a list with 2 characteristics bug
- by user2733911
The goal is to create a list of 99 elements. All elements must be 1s or 0s. The first element must be a 1. There must be 7 1s in total.
import random
import math
import time
# constants determined through testing
generation_constant = 0.96
def generate_candidate():
coin_vector = []
coin_vector.append(1)
for i in range(0, 99):
random_value = random.random()
if (random_value > generation_constant):
coin_vector.append(1)
else:
coin_vector.append(0)
return coin_vector
def validate_candidate(vector):
vector_sum = sum(vector)
sum_test = False
if (vector_sum == 7):
sum_test = True
first_slot = vector[0]
first_test = False
if (first_slot == 1):
first_test = True
return (sum_test and first_test)
vector1 = generate_candidate()
while (validate_candidate(vector1) == False):
vector1 = generate_candidate()
print vector1, sum(vector1), validate_candidate(vector1)
Most of the time, the output is correct, saying something like
[1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 1, 0, 0, 0] 7 True
but sometimes, the output is:
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] 2 False
What exactly am I doing wrong?
