randint[] is an inbuilt function of the random module in Python3. The random module gives access to various useful functions and one of them being able to generate random numbers, which is randint[].
Syntax :
randint[start, end]
Parameters :
[start, end] : Both of them must be integer type values.
Returns :
A random integer in range [start, end] including the end points.
Errors and Exceptions :
ValueError : Returns a ValueError when floating
point values are passed as parameters.
TypeError : Returns a TypeError when anything other than
numeric values are passed as parameters.Code #1 :
Python3
import random
r1 = random.randint[0, 10]
print["Random number between 0 and 10 is % s" % [r1]]
r2 = random.randint[-10, -1]
print["Random number between -10 and -1 is % d" % [r2]]
r3 = random.randint[-5, 5]
print["Random number between -5
and 5 is % d" % [r3]]
Output :
Random number between 0 and 10 is 5 Random number between -10 and -1 is -7 Random number between -5 and 5 is 2
Code #2 : Program demonstrating the ValueError.
Python3
import random
r1 = random.randint[1.23, 9.34]
print[r1]
Output :
Traceback [most recent call last]:
File "/home/f813370b9ea61dd5d55d7dadc8ed5171.py", line 6, in
r1=random.randint[1.23, 9.34]
File "/usr/lib/python3.5/random.py", line 218, in randint
return self.randrange[a, b+1]
File "/usr/lib/python3.5/random.py", line 182, in randrange
raise ValueError["non-integer arg 1 for randrange[]"]
ValueError: non-integer arg 1 for randrange[]Code #3 : Program demonstrating the TypeError.
Python3
import random
r2 = random.randint['a', 'z']
print[r2]
Output :
Traceback [most recent call last]:
File "/home/fb805b21fea0e29c6a65f62b99998953.py", line 5, in
r2=random.randint['a', 'z']
File "/usr/lib/python3.5/random.py", line 218, in randint
return self.randrange[a, b+1]
TypeError: Can't convert 'int' object to str implicitlyApplications : The randint[] function can be used to simulate a lucky draw situation. Let’s say User has participated in a lucky draw competition. The user gets three chances to guess the number between 1 and 10. If guess is correct user wins, else loses the competition.
Python3
from random import randint
def generator[]:
return randint[1, 10]
def rand_guess[]:
random_number = generator[]
guess_left = 3
flag = 0
while guess_left > 0:
guess = int[input["Pick your number to "
"enter the lucky draw\n"]]
if
guess == random_number:
flag = 1
break
else:
print["Wrong Guess!!"]
guess_left -= 1
if flag is 1:
return True
else:
return False
if __name__ == '__main__':
if rand_guess[] is True:
print["Congrats!! You Win."]
else :
print["Sorry, You Lost!"]
Output :
Pick your number to enter the lucky draw 8 Wrong Guess!! Pick your number to enter the lucky draw 9 Wrong Guess!! Pick your number to enter the lucky draw 0 Congrats!! You Win.