Python 中的条件逻辑：增强技能的示例

number = 5

if number > 0:
    print("positive")
elif number < 0:
    print("negative")
else:
    print("zero")

year = 2024  

if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
    print("leap year")
else:
    print("not a leap year")

number = 10 

if number % 2 == 0:
    print("even")
else:
    print("odd")

age = 20

if age >= 18:
    print("eligible to vote")
else:
    print("not eligible to vote")

number = 25  

if number % 5 == 0:
    print("divisible by 5")
else:
    print("not divisible by 5")

input_string = ""  
if not input_string:
    print("empty string")
else:
    print("non-empty string")

number = 21  
if number % 3 == 0 and number % 7 == 0:
    print("multiple of both 3 and 7")
else:
    print("not a multiple of both 3 and 7")

number = 15  
if 10 < number < 20:
    print("between 10 and 20")
else:
    print("not between 10 and 20")

letter = 'a'  
if letter in 'aeiouaeiou':
    print("vowel")
else:
    print("consonant")

number = 150   
if number >= 100:
    print("greater than or equal to 100")
else:
    print("less than 100")

input_string = "hello, world!"   
if input_string.startswith("h"):
    print("starts with h")
else:
    print("does not start with h")

number = 16  # example number to check
if int(number ** 0.5) ** 2 == number:
    print("perfect square")
else:
    print("not a perfect square")

my_dict = {'name': 'John', 'age': 25}  # Example dictionary
if "name" in my_dict:
    print("Key 'name' exists")
else:
    print("Key 'name' does not exist")