Extract Values from Python Dictionary

There are two ways to access values from a Python dictionary, which is by using square brackets [] or the get() method.

For example:

my_dict = {'name': 'Alice', 'age': 30}

# 使用方括号 [] 获取值
name = my_dict['name']
age = my_dict['age']

print(name)  # 输出：Alice
print(age)  # 输出：30

# 使用 get() 方法获取值
name = my_dict.get('name')
age = my_dict.get('age')

print(name)  # 输出：Alice
print(age)  # 输出：30

When retrieving a value using square brackets [], a KeyError exception is thrown if the key does not exist; whereas when retrieving a value using the get() method, it will return None if the key does not exist, and you can also set a default value, for example:

# 使用 get() 方法获取值，并设置默认值
country = my_dict.get('country', 'Unknown')

print(country)  # 输出：Unknown