如何生成大小为 41003 的 0 和 1 数组，并且 1 的数量应该仅为 100？

Question

I want to generate an array of size 41003 containing 0s and 1s. but the number of 1s should be 100. how to do this in python?

I tried to generate using

np.random.randint(2, size=41003) 

but the number of 1s is not 100.

Answer 1

Initialize a list with n=41003 zeros. Then use random.sample(range(n), k=100) to generate 100 non repeated random indices on that list.
Finally, set to 1 the values in the list with those indices.

from random import sample

n = 41003
values = [0] * n
for i in sample(range(0, n), k=100):
    values[i] = 1

print(values.count(1)) # 100