- 替换字符串中的占位符：
name = "Alice"
age = 30
message = "My name is {} and I am {} years old.".format(name, age)
print(message)
- 指定占位符的顺序：
name = "Alice"
age = 30
message = "My name is {1} and I am {0} years old.".format(age, name)
print(message)
- 格式化数字的显示：
num = 123.456789
formatted_num = "{:.2f}".format(num)
print(formatted_num)
- 格式化日期时间：
from datetime import datetime
now = datetime.now()
formatted_date = now.strftime("%Y-%m-%d %H:%M:%S")
print(formatted_date)
- 使用键值对替换占位符：
person = {"name": "Alice", "age": 30}
message = "My name is {name} and I am {age} years old.".format(**person)
print(message)
- 使用列表替换占位符：
items = ["apple", "banana", "cherry"]
message = "I like {} and {} and {}.".format(*items)
print(message)
