Core Python | 2 - Core Python: Getting Started | 2.4 - Introducing Strings, Collections, and Iterati

Strings in Python have the data type str, spelled s‑t‑r, and we've been using them extensively already. Strings are sequences of Unicode code points, and for the most part, you can think of code points as being like characters, although they are not strictly equivalent. The sequence of characters in a Python string is immutable, meaning that once you've constructed a string, you can't modify its contents. Literal strings in Python are delimited by quotes, you could use single quotes or double quotes. You must, however, be consistent. For example, you can't use single quotes on one side and double on the other, like this. Supporting both quoting styles allows you to easily incorporate the other quote character into the literal string without resorting to ugly escape character. Notice that the REPL exploits the same quoting flexibility when echoing the strings back to us. Beautiful text strings rendered in literal form, simple elegance. At first sight, support for both quoting styles seems to violate an important principle of Pythonic style from the Zen of Python. There should be one, and preferably only one, obvious way to do it. In this case, however, another aphorism from the same source, practicality beats purity, takes precedence. The utility of supporting two quoting styles is valued more highly than the alternative, a single quoting style combined with more frequent use of ugly escape sequences, which we'll encounter shortly.

标签：styles,Core,Python,quoting,character,quotes,literal,2.4
来源： https://www.cnblogs.com/hmlhml/p/14410444.html