Python的打印方式：使用'格式'还是百分比形式？ [重复]

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Python string formatting: % vs. .format 14 answers
Python字符串格式：％vs. .format 14个答案

In Python there seem to be two different ways of generating formatted output:

在Python中，似乎有两种不同的生成格式化输出的方法：

user = "Alex"
number = 38746
print("%s asked %d questions on *.com" % (user, number))
print("{0} asked {1} questions on *.com".format(user, number))

Is there one way to be preferred over the other? Are they equivalent, what is the difference? What form should be used, especially for Python3?

有没有一种方法可以优先于另一种方式？它们是等价的，有什么区别？应该使用什么形式，特别是对于Python3？

4 个解决方案

#1

Use the format method, especially if you're concerned about Python 3 and the future. From the documentation:

使用format方法，特别是如果您关注Python 3和未来。从文档：

The formatting operations described here [% substitutions] are obsolete and may go away in future versions of Python. Use the new String Formatting in new code.

这里描述的格式化操作[％substitutions]已经过时，可能会在未来的Python版本中消失。在新代码中使用新的字符串格式。

#2

.format was introduced in Python2.6

.format是在Python2.6中引入的

If you need backward compatibility with earlier Python, you should use %

如果你需要向后兼容早期的Python，你应该使用％

For Python3 and newer you should use .format for sure

对于Python3和更新版本，您应该使用.format

.format is more powerful than %. Porting % to .format is easy but the other way round can be non trivial

.format比％更强大。将％移植到.format很容易，但反过来可能非常简单

#3

You can use both .No one said % formatting expression is deprecated.However,as stated before the format method call is a tad more powerful. Also note that the % expressions are bit more concise and easier to code.Try them and see what suits you best

你可以使用两者。没有人说过％格式表达式已被弃用。但是，如前所述，格式方法调用有点强大。另请注意，％表达式更简洁，更容易编码。尝试使用它们，看看哪种最适合您

#4

The docs say that the format method is preferred for new code. There are currently no plans to remove % formatting, though.

文档说格式方法是新代码的首选。但是，目前没有计划删除％格式。

#1