randrange() Python Function

Examples

Here are basic examples of using randrange() Python function.

Random Number Between Two Values

To get a random number between 5 (inclusive) and 15 (exclusive):

import random
print(random.randrange(5, 15))

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Using Step for Even Numbers

To get a random even number between 0 and 10:

import random
print(random.randrange(0, 10, 2))

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Practical Application

Consider a simple dice-rolling simulation. A dice, when rolled, can give values from 1 to 6. Here's how you can simulate it using randrange():

import random
def roll_dice():
    return random.randrange(1, 7)
print(f"The dice rolled: {roll_dice()}")

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Output:

Comparison with Other Random Functions

randrange() vs. randint():

Both these functions are used to retrieve random integers. While randrange() can take a step argument, randint() only takes the start and stop arguments and returns a random integer between those (inclusive of both).

random.randint(1, 6)  # Similar to the dice roll example

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randrange() for Sequences:

If you want a random choice from a list, tuple, or string, you might want to use random.choice() instead.

choices = ['apple', 'banana', 'cherry']
print(random.choice(choices))

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Also see,   reverse a string in python

Frequently Asked Questions

Can randrange() return floating-point numbers?

No, randrange() is designed to return integers. Use random.uniform() for float values.

Is the output of randrange() truly random?

Not exactly. It's pseudorandom, suitable for most applications but not for cryptographic purposes.

Can I set a seed for randrange()?

Yes, you can use random.seed() to initialize the random number generator, ensuring reproducibility.

Conclusion

The randrange() function, a part of Python's random module, is an indispensable tool for generating random integers within a range. Its flexibility in allowing a start, stop, and step parameter makes it versatile for various applications. Whether simulating a dice roll, choosing a random move in a game, or conducting Monte Carlo simulations, randrange() can be your go-to function for randomness in Python.