# importing the memory tracking module
import tracemalloc
from random import random
from math import floor, sqrt
#from statistics import mean, variance
from time import perf_counter

# starting the monitoring
tracemalloc.start()

start_time = perf_counter()

# store memory consumption before
current_before, peak_before = tracemalloc.get_traced_memory()

N = 10**6
Tot = 0
Tot2 = 0
for _ in range(N):
    item = random()
    Tot  += item
    Tot2 += item ** 2
mean = Tot / N
variance = Tot2 / (N-1) - mean**2

# store memory after
current_after, peak_after = tracemalloc.get_traced_memory()

end_time = perf_counter()

print("mean     :", mean)
print("variance :", variance)

# displaying the memory usage
print("Used memory before : {} B (current), {} B (peak)".format(current_before,peak_before))
print("Used memory after : {} B (current), {} B (peak)".format(current_after,peak_after))
print("Used memory : {} B".format(peak_after - current_before))
print("Time : {} ms".format((end_time - start_time) * 1000))

# stopping the library
tracemalloc.stop()