python如何從字典中讀取值

小億
133
2024-05-15 18:49:14

要從字典中讀取值,可以通過(guò)鍵來(lái)訪問(wèn)對(duì)應(yīng)的值。以下是一個(gè)簡(jiǎn)單的示例:

# 創(chuàng)建一個(gè)字典
my_dict = {"name": "Alice", "age": 30, "city": "New York"}

# 通過(guò)鍵訪問(wèn)值
name = my_dict["name"]
age = my_dict["age"]
city = my_dict["city"]

print("Name:", name)
print("Age:", age)
print("City:", city)

輸出結(jié)果將會(huì)是:

Name: Alice
Age: 30
City: New York

另外,還可以使用 get() 方法來(lái)從字典中讀取值。如果鍵不存在,get() 方法會(huì)返回 None 或者指定的默認(rèn)值。以下是一個(gè)示例:

# 創(chuàng)建一個(gè)字典
my_dict = {"name": "Alice", "age": 30, "city": "New York"}

# 使用 get() 方法訪問(wèn)值
name = my_dict.get("name")
gender = my_dict.get("gender", "Unknown")

print("Name:", name)
print("Gender:", gender)

輸出結(jié)果將會(huì)是:

Name: Alice
Gender: Unknown

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