Fun Python Code Examples: Heart Pattern, Multiplication Table, Wave Display, and Simple Login Simulation

Python is a clear and easy-to-learn language, and this article showcases several entertaining code examples that reveal its expressive power.

Heart pattern – a one‑liner that prints a stylized “Love” heart using mathematical conditions.

print('\n'.join([''.join(('Love'[(x-y)%4] if ((x*0.05)**2+(y*0.1)**2-1)**3-(x*0.05)**2*(y*0.1)**3<=0 else ' ') for x in range(-30,30)]) for y in range(15,-15,-1)))

9×9 multiplication table – generates the full table with formatted strings.

print('\n'.join([' '.join(['%s*%s=%-2s' % (y,x,x*y) for y in range(1,x+1)]) for x in range(1,10)]))

Wave display – an infinite loop that randomly prints the characters “╱” or “╲” to simulate a moving wave.

while 1: import random; print(random.choice('╱╲'), end='')

Simple login simulation – creates a random username (5 letters) and password (6 alphanumeric characters) and then prompts the user to enter them, allowing three attempts for each before restarting.

import random, string
p = "".join([random.choice(string.ascii_letters) for i in range(5)])
q = "".join([random.choice(string.ascii_letters+string.hexdigits) for i in range(6)])
print(p)
print(q)
# login logic
flag = 0
count = 0
while True:
    username = input("输入你的名字")
    if username == p:
        while True:
            passwd = input("输入你的密码")
            if passwd == q:
                print("成功进入")
                break
            else:
                flag += 1
            if flag == 3:
                break
    else:
        count += 1
    if count == 3:
        break

Images illustrating the output of the heart pattern and wave animation are included in the original article.