How to make python code more Pythonic
Today, I will talk to you about how to make the python code more Pythonic. Many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.
This article, mainly introduces a few simple techniques, let you write Python code, more Pythonic.
Variable exchange
Pythonic writing method
Common writing method
Loop through interval elements
In Python2, there are range and xrange2 writing methods, and xrange is a generator writing method, which saves memory. Range in Python3 is equivalent to xrange in Python2.
The generator is generated dynamically only when it is used, and can only be used once, such as range (1000000). A list of 1 million elements is generated in Python2, but not a list, but a generator in Python3, which takes up very little memory.
If you are still using Python2, it is recommended to use xrange instead of range
The way Java is written
Generator extension
Indexes
Pythonic writing method
Common writing method
Obviously, Pythonic is written in a more intuitive and elegant way.
String concatenation
Pythonic writing method
Common writing method
Each + operation produces a new string, resulting in a waste of memory, while join produces only one string object in the whole process.
File opening and closing
Pythonic writing method
Common writing method
Using with,Python will automatically manage the opening and closing of file streams without manual operation
List operation
Pythonic writing method
Common writing method
List can also delete * elements with pop (0), but list is stored sequentially in memory. Deleting * elements will cause all subsequent elements to move forward, which is inefficient and similar to insertion.
Avoid using list if there are a large number of deletions and inserts at the beginning
Deconstruction assignment
Pythonic writing method
Similarly, in Python2, the dictionary's items method returns a list, which consumes a lot of memory when the dictionary is large. The iteritems method returns the generator.
In Python3, no iteritems,items is equivalent to the iteritems of Python2.
If you are using Python2, use iteritems instead of items
Derivation type
Pythonic writing method
Common writing method
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