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在 Python 中,f-string 是一种用于格式化字符串的方法。你可以在字符串前加上字母 f(可以是大写或小写)并在字符串中使用大括号 {}
来表示要插入的变量或表达式。当字符串以 f 开头时,大括号内的表达式会被计算并替换为其值。
以下是使用 f-string 的一些示例用法:
- name = "Alice"
- age = 30
- text = f"My name is {name} and I am {age} years old."
- print(text)
- # 输出: My name is Alice and I am 30 years old.
- a = 10
- b = 20
- result = f"The sum of {a} and {b} is {a+b}."
- print(result)
- # 输出: The sum of 10 and 20 is 30.
- value = 3.14159
- formatted_value = f"Pi is approximately {value:.2f}"
- print(formatted_value)
- # 输出: Pi is approximately 3.14
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