sample an array python code example

Example 1: sample 1 item from array python

import random
cakes = ['lemon', 'strawberry', 'chocolate']
random.choice(cakes)
# prints 1 randomly selected item from the collection of n items with 
# the probability of selection as 1/n

Example 2: python choose random sample from list

import random
sequence = [i for i in range(20)]
subset = random.sample(sequence, 5) #5 is the lenth of the sample
print(subset) # prints 5 random numbers from sequence (without replacement)

Example 3: python array[:

import array as arr

numbers_list = [2, 5, 62, 5, 42, 52, 48, 5]
numbers_array = arr.array('i', numbers_list)

print(numbers_array[2:5]) # 3rd to 5th
print(numbers_array[:-5]) # beginning to 4th
print(numbers_array[5:])  # 6th to end
print(numbers_array[:])   # beginning to end