neozheng

摘要： 1. Object Representations Every object-oriented language has at least one standard way of getting a string representation from any object. Python has 阅读全文

摘要： 1. Varaibles Are Labels, Not Boxes. Python varaibles are like reference variables in Java, so it's better to think of them as labels attached to objec 阅读全文

摘要： Function decorators let us "mark" functions in the source code to enhance their behavior in some way. This is powful stuff, but mastering it requires 阅读全文

摘要： Although design patterns are language-independent, that does not mean every pattern applies to every language. If we assumed procedural languages, we 阅读全文

摘要： The "First-Class object" in Python: Created at runtime Assigned to a variable or element in a data structure Pass as an augument to a function Return 阅读全文

摘要： 1. Handling missing keys with setdefault import sys import re WORD_RE = re.compile('\w+') index = {} print(sys.argv) # Example 3-2 with open(sys.argv[ 阅读全文

摘要： 1. Managing Ordered Sequences with bisect The bisect module offers two main functions bisect and insort that use the binary serach algorithm to quickl 阅读全文

摘要： 1. Listcomps (List comprehensions) do everything the map and filter functions do. (map 函数和 filter函数能做的，列表生成式都可以做) 列表生成式和 map, filter 函数运行时间的比较示例： impo 阅读全文

摘要： 列表推导式总共有两种形式： ① [x for x in data if condition] # 此处if主要起条件判断作用，data数据中只有满足if条件的才会被留下，最后统一生成为一个数据列表 ② [exp1 if condition else exp2 for x in data] # 此处i 阅读全文

摘要： Markdown 是一种轻量级标记语言，它允许人们使用易读、易写的纯文本格式编写文档。Markdown 语言需要经过编辑器的渲染才能呈现出各种优美的格式。 Markdown 的使用场景： 当你对文章的排版没什么特殊需求，且不想花太多时间在排版上时，就可以使用 Markdown。因为编辑器或平台会通过 阅读全文