Python del函数用法介绍

x = 5
print(x)  # 输出: 5

del x

print(x)  # 抛出NameError异常

5
Traceback (most recent call last):
  File "<stdin>", line 5, in <module>
NameError: name 'x' is not defined

x = 5
y = 10

print(x, y)  # 输出: 5 10

del x, y

print(x, y)  # 抛出NameError异常

5 10
Traceback (most recent call last):
  File "<stdin>", line 8, in <module>
NameError: name 'x' is not defined

my_list = [1, 2, 3, 4, 5]
print(my_list)  # 输出: [1, 2, 3, 4, 5]

del my_list[0]  # 删除第一个元素
print(my_list)  # 输出: [2, 3, 4, 5]

del my_list[1:3]  # 删除第二、三个元素
print(my_list)  # 输出: [2, 5]

[1, 2, 3, 4, 5]
[2, 3, 4, 5]
[2, 5]

my_dict = {'name': 'Alice', 'age': 25, 'gender': 'female'}
print(my_dict)  # 输出: {'name': 'Alice', 'age': 25, 'gender': 'female'}

del my_dict['age']  # 删除键为'age'的键值对
print(my_dict)  # 输出: {'name': 'Alice', 'gender': 'female'}

del my_dict['name'], my_dict['gender']  # 删除多个键值对
print(my_dict)  # 输出: {}

{'name': 'Alice', 'age': 25, 'gender': 'female'}
{'name': 'Alice', 'gender': 'female'}
{}