小编Tak*_*shi的帖子

在python文档2.4.3中。格式化的字符串文字，似乎可以在f字符串中写一个星号后跟一个表达式{}，但是我找不到如何使用它。

那是什么以及我如何使用它？是否记录在某处？

确切地说，这是关于"*" or_expr以下BNF的一部分。

f_string          ::=  (literal_char | "{{" | "}}" | replacement_field)*
replacement_field ::=  "{" f_expression ["!" conversion] [":" format_spec] "}"
f_expression      ::=  (conditional_expression | "*" or_expr)
                         ("," conditional_expression | "," "*" or_expr)* [","]
                       | yield_expression

我在REPL中尝试过，但是会导致错误。

f_string          ::=  (literal_char | "{{" | "}}" | replacement_field)*
replacement_field ::=  "{" f_expression ["!" conversion] [":" format_spec] "}"
f_expression      ::=  (conditional_expression | "*" or_expr)
                         ("," conditional_expression | "," "*" or_expr)* [","]
                       | yield_expression