Python List reverse()用法及代码示例

列出 reverse() 方法

reverse() 方法用于反转列表中的元素，该方法使用此列表(我们必须反转元素的列表)调用，并反转列表中的所有元素。

用法:

    list_name.reverse()

参数：

• 它不接受任何参数。

返回值：

这个方法的返回类型是<class 'NoneType'>，它什么都不返回。

范例1：

# Python List reverse() Method with Example

# declaring the list
cars = ["BMW", "Porsche", "Audi", "Lexus", "Audi"]

# printing the list
print("cars before reverse operations...")
print("cars:", cars)

# reversing the list elements
cars.reverse()

# printing the list 
print("cars after reverse operations...")
print("cars:", cars)

输出

cars before reverse operations...
cars: ['BMW', 'Porsche', 'Audi', 'Lexus', 'Audi']
cars after reverse operations...
cars: ['Audi', 'Lexus', 'Audi', 'Porsche', 'BMW']

范例2：

# Python List reverse() Method with Example

# declaring the list
x = [100, 200, 30, 40, 50, 60, 700]

# printing the list
print("x before reverse operations...")
print("x:", x)

# reversing list elements
x.reverse();

# printing the list
print("x after reverse operations...")
print("x:", x)

输出

x before reverse operations...
x: [100, 200, 30, 40, 50, 60, 700]
x after reverse operations...
x: [700, 60, 50, 40, 30, 200, 100]