The default parameter values of Python functions have been generated when the function is defined. Mutable objects cannot be used
def test_fun(elem, lis=[]): if elem==e: lis.clear() lis.append(elem) return lis
Update method of Python collection
aset = { 1, 2, 3} aset.update() # It is OK not to pass parameters , Return as is
The difference between Python lists sort and sorted
sort() Its a list method , Need to call through list , Will sort the original li
The python dictionary update method can only pass in one parameter at most, and the collection update method can have multiple parameters
adict={ a:1,b:2} adict.update({ c:3},{ d:4}) print(adict) Output ：TypeError: up
Python crawls mobile app data
Preface Now a lot of data comes from mobile terminals app, A lot of data acquis
Python crawls Recruitment Information
selenium Pit in application selenium The use of the library allows you to bypass
Python Matplotlib data visualization case - generate histogram, pie chart (sector chart) and word cloud.
at present python,spark,scala Very hot , So I used the crawler to get the recrui
Based on python3 network
Network programming The Internet ： Network protocol ： A set of rules Network m
Using Python to write mail sending module
Email Mail history ... origin It is a development of communication , Too lazy t
python3.6。 Introduction notes of reptile learning
Reptiles Prerequisite knowledge ： URLHTTP agreement web front end ,html css jsa
Learning and application of Pythons scrapy
Scrapy Introduction to reptiles to mastery http://scrapy-chs.readthedocs.io/zh_C
Python字典update方法最多只能傳入一個參數，集合update方法可以多個
adict={ a:1,b:2} adict.update({ c:3},{ d:4}) print(adict) 輸出：TypeError: update e
Python函數的默認參數值在定義函數時已經生成，不能使用可變對象
def test_fun(elem, lis=[]): if elem==e: lis.clear() lis.append(elem) return lis
Wuhan University of technology Python Program Design Chapter 9 test
import numpy as npprint(np.array([1, 2, 3, 4])) The running result of the above
Wuhan University of technology Python Program Design Chapter 5 test
s.count(x) The return value of ：B. character string s in x The number of Used t
Wuhan University of technology Python program design chapter 4 test
The keyword defining the function is ：D.defif name == ‘main’: When do the statem
Wuhan University of technology Python Program Design Chapter 8 test
Close file object file The sentence is ：B. file.close() Open the file in read mo
武漢理工大學 Python程序設計第四章測驗
定義函數的關鍵字是：D.defif name == ‘main’: 下面語句塊中的語句何時執行？B.當程序文件作業腳本直接執行時才會被執行小明是一個汽車迷，看到
