Just like the math and cmath modules, the 'random' module is built in into Python, so we do not need to take any extra efforts to download or install it.😊
random() method in random module generates a floating point number between 0 and 1. Note that Python is case sensitive, hence
Random() are different!
import random #import the random module for i in range(0,5): n = random.random() print(n)
0.8231210971019169 0.7495851490827552 0.1910088487916375 0.7611387314935155 0.17622975226933524
But many times we want a number in between a specific range of numbers. This is where the
randint() method comes handy. The
randint() method generates a integer between a given range of numbers.
import random for i in range(0,5): n = random.randint(3,7) print(n)
7 4 3 6 7
Note that the input parameters of the
randint() gives must be in ascending order only. For example this won't work
import random for i in range(0,5): n = random.randint(7,5) print(n)
Traceback (most recent call last): File "main.py", line 3, in <module> n = random.randint(10,7) File "/usr/lib/python3.4/random.py", line 218, in randint return self.randrange(a, b+1) File "/usr/lib/python3.4/random.py", line 196, in randrange raise ValueError("empty range for randrange() (%d,%d, %d)" % (istart, istop, width)) ValueError: empty range for randrange() (10,8, -2)
random()method is often used in data science and statistical operations to obtain random numbers between 0 to 1. For other applications, in most cases the
randint()function becomes useful
Typing 'random' every time is just a waste right? We can shorten up the code by replacing random with a short keyword, whoch we can use everytime. The syntax for the following is
import random as rd
So now every time instead of writing
random, we can just write
import random as rd for i in range(0,5): n = rd.randint(1,10) print(n)
5 1 2 9 9
Many times, we require to have a list of random numbers.
One way to do that is appending random numbers to the list. We first create an empty list and then append the random numbers one by one.
import random as rd randomlist =  for i in range(0,5): randomlist.append(rd.randint(15,30)) print(randomlist)
[23, 15, 26, 26, 18]
Another way is by using the method
sample() method takes two arguments. One is the list of numbers to choose random numbers from, and the other is the number of random numbers to choose. The examples below will make things clear.
import random as rd randomlist = rd.sample(range(15, 30), 5) print(randomlist)
[28, 24, 15, 26, 19]
range()function returns a list of values from the start to the end.
import random as rd randomlist = rd.sample([2,3,5,7,11,13,17], 5) #Here the sample returns a random number from the list of prime numbers provided. print(randomlist)
[7, 5, 2, 3, 17]
😎 Your suggestions motivate me, so please please please let me know in the comment section if you this part or not. 🧐 And don't forget to like the post if you did. 😍