Some fun oneliners I have made to do math problems easier

python_math_hacks.py

import math

### Find Population Standard Deviation ###
pop = [103,99,108,105,114,101]
math.sqrt(sum(list(map(lambda x: (x-sum(pop)/len(pop))**2, pop)))/len(pop))

### Sigma Notation Using Range And Sum
# sum(range(first_num, last_num, step))
sum(range(2, -449, -5))

### Permutations/Combinations ###
r = 6  # How many per
n = 15 # Total
math.factorial(n)/math.factorial(n-r)                      # Permutations
math.factorial(n)/(math.factorial(r)*math.factorial(n-r))  # Combinations