Programmer Think

Article directory First, what is Stream? 2. Three steps of Stream operation 3. Creating Stream IV. Stream's Intermediate Operation 4.1. Screening and slicing 4.2. Mapping: (emphasis) 4.3. Sort: V. Termination of Stream 5.1. Finding and Matching 5.2. Reduction: (emphasis) 5.3. Collection: (emphasis) 5.4, grouping 5.5, zonin ...

Order of function calls Similar to other languages. python functions are not allowed to be referenced and invoked until they are declared. 1. Calls or references will report errors before they are declared. 2 def t1(): 3 print('This is t1...') 4 t2() 5 6 t1() 7 8 def t2(): 9 print('This is t2...') 10 11 12 Display ...

Function: Function definition keyword def followed by function name def: Function name (parameter):             ... Function body     ... Return value Case study: 　　 # Defined function def say_hei(): print('hello world!!') # function call say_hei() 　 Calling function Function call: function name with parentheses 1 Find the ...

Object-Oriented Advancement I. isinstance and issubclass built-in methods 1,isinstance(obj,cls) Function: Check whether obj is an object of cls class? 2,issubclass(sub, super) Function: Check whether the sub class is a derivative of the super class? 2. Reflex (introspection) 1. Definition: The concept of reflecti ...

One day, you wrote a lot of constructors with "formal parameters" (that is, methods, synonyms), and you need to pass the same "argument" to these constructors, then you call a function and give the same "argument". That's the end of the day. A few days later, you will call so many functions again, and you will call ...

Python crawler and python teaching video of data analysis, Python source code sharing, Python Python crawler and basic data analysis tutorial: Python grammar, dictionary, tuples, lists Advanced tutorials on Python crawlers and data analysis: file manipulation, lambda expressions, recursion, yield generator Python crawler and data analysis mo ...

Using API, first look at the next interface document   First, the python version 2.7 code #encoding=utf-8 import requests import time import string import random import base64 import hashlib import urllib from urllib import urlencode from requests.packages.urllib3.exceptions import InsecureRequestWarning requests.packag ...

scene At this time, there is a scenario, which needs to design a different business processing mode according to different states and conditions. This may not be very understandable. For example, businesses on streets and lanes now use aggregated payment. Aggregated payment is a two-dimensional code supporting Alipay, WeChat, Jingdong wallet, U ...

We introduced the binary search tree and two higher-level data structures, set and mapping, which are implemented by the binary search tree. Tree data structure plays an important role in the field of computer. It is important because trees can produce many extensions, change or restrict the nature of tree data structure slightly i ...

#####1, Lambda expression Lambda is an anonymous function, and we can think of a Lambda expression as a piece of code that can be passed (passing code like data).You can write simpler, more flexible code.As a more compact code style, Java's language expressiveness has been enhanced. 　　 #####2, from anonymous internal functions ...