First, the programming paradigm
Refers to a programming paradigm programming routine, into object-oriented , functional , object-oriented , etc.
Second, process-oriented
1. Process for the basic concepts
The core for that process , process refers to the steps to resolve the problem, which is to do, after what
Process-oriented development process like an assembly line relates, it is a mechanical way of thinking
Pros: The complex issue processes, thus simplifying
Disadvantages: Scalability procedures difference
2. The process-oriented programming scenarios analytical thinking
- Not all software requires frequent changes, such as scripting
- Even a software requires frequent changes, nor does not mean that all the software components of the change are required together
Third, functional
The difference is that with the process-oriented, functional pay more attention to results
1. anonymous function
def for defining a named function
# 示例
def func(x,y)
return x + y
Since there is well-known function, of course, there is an anonymous function that defines an anonymous function lambda
lambda x,y:x + y # 相当于上述的func函数
# lambda x,y:x + y 此处的（x,y）为入口参数，x + y则为函数体
lambda functions simplifies the written form of a function definition, makes the code more compact, but even more a function definition is intuitive, easy to understand
Anonymous function is called once for temporary scene: more anonymous is used in conjunction with other functions
2. Application anonymous function
1) map functions
map () function will do the mapping functions provided according to a designated sequence
grammar
map(function,iterable,...)
parameter
- function- function
- one or more sequences iterable-
return value
Iterator (python3)
List (python2)
2) filter function
filter () function is used to filter sequences, filtering out non-compliant elements, returns an iterator object
grammar
filter(function,iterable)
parameter
- function - judging function
- iterable - iterables
return value
Iterator object
3) reduce function
reduce () function parameter elements in the sequence will be accumulated
grammar
reduce(function,iterable,[initializer])
parameter
- function- function, there are two parameters
- iterable- iterables
- initializer- Alternatively, the initial parameter
return value
The calculation result of the function
4) max function
max () function returns the maximum value of a given parameter, the parameter sequence may be
grammar
max(x,y,z,...)
parameter
- x - numeric expression
- y - numeric expression
- z - refers to the number of expression
return value
The maximum value of a given parameter
5) min function
min () function with the max () function is a different, it returns the minimum value of a given parameter, the parameter sequence may be
grammar
max(x,y,z,...)
parameter
- x - numeric expression
- y - numeric expression
- z - refers to the number of expression
return value
A minimum value of the given parameter
6) sorted function
sorted () function operation on all sorts of objects iterations
grammar
# 语法
sorted(iterable,key = None,reverse = False)
# iterable —— 可迭代对象
# key —— 主要用来比较的元素，只有一个参数，参数取自可迭代对象中
# reverse —— 排序规则，True为降序，False为升序（默认）
parameter
- iterable - iterables
- key - the main element for comparison, only one parameter, the parameter is taken from iterable
- reverse - collation, True descending, False ascending order (the default)
return value
Reordered list