获取“无效语法"尝试执行字符串插值时 [英] Getting an "invalid syntax" when trying to perform string interpolation

问题描述

我最近一直在学习 python 3，但我无法得到任何涉及字符串插值(格式化)的示例.

I have recently been learning python 3 and I cannot get any examples involving string interpolation (formatting) to work.

In [1]: state = "Washington"

In [2]: state
Out[2]: 'Washington'

In [3]: my_message = f"I live in {state}"
File "<ipython-input-3-d004dd9e0255>", line 1
my_message = f"I live in {state}"
                                ^
SyntaxError: invalid syntax

我认为我的机器默认使用 python 2，但快速检查显示:

I figured my machine was defaulting to python 2, but a quick check reveals:

Python 3.5.2 (default, Nov 17 2016, 17:05:23) 
Type "copyright", "credits" or "license" for more information.

IPython 5.2.2 -- An enhanced Interactive Python.

我使用的是 Ubuntu 16.04:

I am on Ubuntu 16.04:

python3 --version
Python 3.5.2

我是否只是忽略了基本语法?我已经在同学的几台电脑上运行了相同的命令，它似乎执行得很好.

Am I just overlooking basic syntax? I have run the same commands on a few computers from fellow students and it seems to execute just fine.

推荐答案

正如 Josh Lee 在评论部分所建议的那样，这种字符串插值仅在 Python 3.6 中添加，请参阅 Python 3.6 的新功能(这里称为PEP 498:格式化字符串文字").

As suggested by Josh Lee in the comment section, that kind of string interpolation was added in Python 3.6 only, see What’s New In Python 3.6 (here it's called "PEP 498: Formatted string literals").

然而，您似乎使用的是不支持该语法的 Python 3.5.2.

You, however, seems to be using Python 3.5.2, which does not support that syntax.

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