以下是针对 Python 开发的一些常用代码片段模板,可以帮助开发者快速构建项目。
列表推导式
使用列表推导式可以简洁地创建列表,以下是一个示例:
numbers = [1, 2, 3, 4, 5]
squared_numbers = [x**2 for x in numbers]
函数定义
定义函数时,可以指定默认参数和可变参数,如下:
def greet(name, msg="Hello"):
print(msg, name)
greet("Alice") # 输出: Hello Alice
greet("Bob", "Goodbye") # 输出: Goodbye Bob
生成器
生成器可以用来创建迭代器,以下是一个生成器函数的示例:
def even_numbers():
for number in range(1, 10):
if number % 2 == 0:
yield number
for num in even_numbers():
print(num) # 输出: 2 4 6 8
装饰器
装饰器可以用来修改函数的行为,以下是一个简单的装饰器示例:
def my_decorator(func):
def wrapper():
print("Something is happening before the function is called.")
func()
print("Something is happening after the function is called.")
return wrapper
@my_decorator
def say_hello():
print("Hello!")
say_hello()
# 输出:
# Something is happening before the function is called.
# Hello!
# Something is happening after the function is called.
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