python - 高级字符串格式化与模板字符串

Question

我想知道使用 template strings 是否有优势而不是新的advanced string formatting ?

Answer 1

模板旨在比通常的字符串格式更简单，但以牺牲表现力为代价。 PEP 292 的基本原理将模板与 Python 的 % 风格的字符串格式进行比较:

Python currently supports a string substitution syntax based on C's printf() '%' formatting character. While quite rich, %-formatting codes are also error prone, even for experienced Python programmers. A common mistake is to leave off the trailing format character, e.g. the s in %(name)s.

In addition, the rules for what can follow a % sign are fairly complex, while the usual application rarely needs such complexity. Most scripts need to do some string interpolation, but most of those use simple "stringification" formats, i.e. %s or %(name)s This form should be made simpler and less error prone.

虽然新的 .format() 改善了这种情况，但 format string syntax 仍然是事实。比较复杂，所以原理还是有道理的。