mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 17:08:35 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 13

Improve docstring for random.binomialvariate (gh-131164)

Browse source 
Add probability distribution to the docstring
This commit is contained in:
Raymond Hettinger 2025-03-12 13:25:31 -05:00 • committed by GitHub
parent 776ec1e167
commit 25f24b01e3
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 8 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Lib/random.py
View file

@ -792,12 +792,18 @@ class Random(_random.Random):
sum(random() < p for i in range(n))
Returns an integer in the range: 0 <= X <= n
Returns an integer in the range:
0 <= X <= n
The integer is chosen with the probability:
P(X == k) = math.comb(n, k) * p ** k * (1 - p) ** (n - k)
The mean (expected value) and variance of the random variable are:
E[X] = n * p
Var[x] = n * p * (1 - p)
Var[X] = n * p * (1 - p)
"""
# Error check inputs and handle edge cases