Python for Beginners: Master Random Number Generation in 3 Minutes to Easily Create Your Own Data Lists

This article is especially suitable for students who have just learned the basic syntax of Python; even those with no background can easily get started!

In daily programming, we often need to generate random numbers—such as when developing a guessing game, a lottery program, or creating test data for data analysis. Today, we will teach you how to play with random numbers in Python in the most straightforward way!

🔑 Summoning the “Random Number Generator”

Python has a powerful toolbox called <span>random</span>, which can be summoned with just one line of code:

import random  # Summon our random number tool

🎲 Generating a Single Random Number (Super Simple)

Want to generate an integer? Try this:

import random 
# Generate a random integer between 1 and 10 (inclusive)
dice = random.randint(1, 10)
print("Random dice roll:", dice)  # Output could be: 7

Want a random number with decimals:

import random 
# Generate a random float between 0.0 and 1.0
percent = random.random()
print("Task completion: {:.1f}%".format(percent*100)) 
# Example output: Task completion: 73.8%

Tip: <span>{:.1f}</span> can keep the decimal to one place for a more aesthetically pleasing output.

📋 Creating a List of Random Numbers (Advanced)

Scenario Simulation: A teacher needs to randomly assign grades to 10 students (50-100 points).

import random

# Create an empty grade list
score_list = []

for i in range(10):
    # Generate a random grade
    score = random.randint(50, 100)
    # Add to the grade list
    score_list.append(score)

print("Class grade list:", score_list)
# Example output: [78, 92, 65, 88, 73, 95, 81, 69, 85, 77]

Float version (suitable for generating temperature, price, etc.):

import random
# Generate 5 temperature data points between 35.0 and 40.0
temperature_list = []

for i in range(5):
    # Generate random temperature, keeping one decimal place
temp = round(random.uniform(35.0, 40.0), 1)
temperature_list.append(temp)

print("Temperature records:", temperature_list, "℃")
# Example output: [36.7, 37.2, 38.5, 36.2, 37.8] ℃

Key Notes:

1. <span>round(x, 1)</span> can keep the decimal to one place.

2. <span>uniform(a, b)</span> is specifically for generating floats within a range.

🎯 Simple Lottery Program

import random

# List of employees participating in the lottery
employees = ["Zhang San", "Li Si", "Wang Wu", "Zhao Liu", "Qian Qi"]

# Randomly select 3 lucky winners
winners = []
for _ in range(3):
    lucky_index = random.randint(0, len(employees)-1)
    winners.append(employees[lucky_index])

print("Winners list:", winners)

💡 Tips

1. Fixing Random Results (super useful for debugging):

import random
random.seed(42)  # Set random seed
print(random.randint(1,100))  # Always outputs 82

2. More Concise Syntax (using list comprehensions):

import random
# Generate 10 random numbers in one line
rand_list = [random.randint(1,100) for _ in range(10)]
print(rand_list)

3. Important Reminder:

The built-in <span>random</span> module in Python is not suitable for generating passwords or other security scenarios; for such needs, use the more specialized <span>secrets</span> module.

✏️ Hands-On Practice

Try generating a list containing 20 elements, each being a two-digit random integer (10-99). After completing, you can try to:

1. Calculate the average of the list
2. Find the maximum and minimum values
3. Develop a simple guessing game

The best way to learn programming is through hands-on practice! If you encounter any issues, feel free to leave a comment for discussion~