Hidden features of Python(Python的隐藏特性)
本文介绍了Python的隐藏特性的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
What are the lesser-known but useful features of the Python programming language?
- Try to limit answers to Python core.
- One feature per answer.
- Give an example and short description of the feature, not just a link to documentation.
- Label the feature using a title as the first line.
Quick links to answers:
- Argument Unpacking
- Braces
- Chaining Comparison Operators
- Decorators
- Default Argument Gotchas / Dangers of Mutable Default arguments
- Descriptors
- Dictionary default
.get
value - Docstring Tests
- Ellipsis Slicing Syntax
- Enumeration
- For/else
- Function as iter() argument
- Generator expressions
import this
- In Place Value Swapping
- List stepping
__missing__
items- Multi-line Regex
- Named string formatting
- Nested list/generator comprehensions
- New types at runtime
.pth
files- ROT13 Encoding
- Regex Debugging
- Sending to Generators
- Tab Completion in Interactive Interpreter
- Ternary Expression
try/except/else
- Unpacking+
print()
function with
statement
解决方案
Chaining comparison operators:
>>> x = 5
>>> 1 < x < 10
True
>>> 10 < x < 20
False
>>> x < 10 < x*10 < 100
True
>>> 10 > x <= 9
True
>>> 5 == x > 4
True
In case you're thinking it's doing 1 < x
, which comes out as True
, and then comparing True < 10
, which is also True
, then no, that's really not what happens (see the last example.) It's really translating into 1 < x and x < 10
, and x < 10 and 10 < x * 10 and x*10 < 100
, but with less typing and each term is only evaluated once.
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