codecademy python review

keep improving. You can replace that part of the loop with the following list resolution Copy Code code as follows: #!/usr/bin/env python #coding: Utf-8 Import Random numbers = [Random.randint (1,100) for I in range] #以list解析的方式得到随机的list Odd = [x for x in numbers if x%2!=0]even = [x for x in numbers if x%2==0] Print numbersPrint "Odd:", oddPrint "even:", even An interesting assignment On the assignment, reade

Python Practical case basic knowledge of Python All the contents of this article are notes made during the study period, only for personal inspection and review convenience and record. All content is excerpted from: http://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000 data type integer floating-point number String if the string conta

decoding　　#python internal encoding is Unicode#encode and Decode, that is--convert by a Unicode#If you specify the encoding #-*-coding:gbk-*-in the header of the file, this means that the file is parsed by what encoding, not the content in the file is parsed by what encoding,#the contents of the file are encoded in Unicode and are bytes after encodingString ="Hello"String_to_utf8= String.encode ("Utf-8") STRING_UTF8_TO_GBK= String_to_utf8.decode ("Ut

This case is about capturing the loaded data from JavaScript. For more information, see: Python Learning Guide #-*-coding:utf-8-*-ImportRequestsImportReImportTimeImportJson#数据下载器classHtmldownloader (Object):defDownload Self, URL, params=None):ifUrl is None:return NoneUser_agent= ' mozilla/5.0 (Windows NT 6.1; WOW64; rv:48.0) gecko/20100101 firefox/48.0 'Headers={' User-agent ': User_agent}ifParams is None: R=Requests.get (URL, headers=HeadersElse

Recently collected the day Cat search page about the windbreaker baby information and 14,676 comments data. So I thought about making a word cloud about the comment data.Let's take a look at the effect chart: From the above picture can see clothes, good, quality, good, like the larger keywords, that the baby in the day cat should be sold better. The specific implementation process is documented below.[TOC] Data preview: Python version 3.4.4: jieba; Wo

in Sys.path When the Python interpreter is started, the search path is saved in the Sys.path variable of the SYS module:>>> import sys>>> sys.path[', '/usr/local/lib/python2.7/dist-packages/pip-8.0.2-py2.7.egg ', '/ Usr/local/lib/python2.7/dist-packages/setuptools-3.3-py2.7.egg ', '/usr/lib/python2.7 ', '/usr/lib/python2.7/ Plat-x86_64-linux-gnu ', '/usr/lib/python2.7/lib-tk ', '/usr/lib/python2.7/lib-old ', '/usr/lib/python2.7/ Lib-dynload ', '

0. DescriptionA sequence is a generic term for some of the data types of python, such as strings, lists, and tuples, which are collectively referred to as sequences because their members are arranged in an orderly manner and can be accessed by the subscript offset to one or more of its members .The idea is to first introduce the operators and the built-in functions that apply to all sequence types, and then describe each of these sequence types separa

': ' Girl '}>>> fdict.has_key (' xpleaf ') true>>> ' xpleaf ' in Fdicttrue>>> ' Clyyh ' in Fdictfalse(3) Updating the dictionaryYou can update existing key-value pairs or add new key-value pairs:>>> fdict = {' host ': ' Xpleaf ', ' Port ': 80}>>> fdict[' port '] = 3389>>> fdict[' ip '] = ' 121.42.147 .131 ' >>> print ' Host:% (host) s, Port:% (port) s, IP:% (IP) s '% fdicthost:xpleaf, port:3389, ip:121.42.147.131(4) Delete dictionary elements and dictionaries>>> fdict = {' host ': ' Xpleaf ', '

, comment)print(r2.text)Look at the effect:Self-initiatedOf course, the above finally the number of the pass can also be manually review and grab the package software to crawl, just by looking at commetn.js the file also give my own proactive comments provide the direction, there is a load_comment_form() way. is used to load comment-form, it gives the definition of action:action="/‘ + username + ‘/comment/submit?id=‘ + fileName + ‘"The writing was ver

environment: Win7 pycharmce_2017.2 python3.6.2 Take one last review. 3.list and tuple The list is also a data type. You can delete, add elements at any timeAnd the elements in the list are not restricted by type, as opposed to arrays in C, or int or char. and the list can >>> a=[1,2,3, ' Hi ', [4, ' hi~ ']] >>> a [1, 2, 3, ' Hi ', [4, ' hi~ ']] >>> a[0] 1 >>> a[4][1] ' hi~ ' >>> a[-1] [4, ' hi~ '] >>> That is, the list of what data types can be, but

=" Utf-8 ") as File2: #用户退出时, save the user balance to a file for the next call to File2.write (" \ n "+username+": "+str (User_wage)) With open ("User", "A +", encoding= "Utf-8") as File1: #用户退出时, the user name is stored in the file for the next call to File1.write ("\ n "+username+": "+ Password ) exit_shoping () else:print ("Wrong number,please input again") if username not in Dict_user: #检验用户是新用户 user_wage = Int (input ("your wage:")) shoping (user_wage) elif use Rname in Dict_user: #

= [' Rain ', ' Sir ']A2 = Dict (Enumerate (A1))Print (A2)b, the basic characteristicsN1.fromkeys ()--------------------------------------------------used to create a new dictionaryIf there is a Staticmethod word on the top of a method then this is called with a class, as usual we usually use objects to invoke the methodExample:N1 = Dict.fromkeys ([' K1 ', ' K2 ', ' K3 '],[])Print (N1)n1["K1"].append (' BBB ')Print (N1)Output Result:{' K1 ': [], ' K2 ': [], ' K3 ': []}{' K1 ': [' BBB '], ' K2 ':

Jingdong Book review has a very rich information, which contains the date of purchase, the title, author, Praise, in the evaluation, the difference between the evaluation and so on. Take the purchase date as an example, using Python + MySQL with the implementation of the program is not large, only 100 lines. I have raised the relevant explanations in the program: From selenium import WebdriverFrom BS4 impo

Recently want to see a film, to know the review, just learning Python crawler, do a small example.Code modified based on third-party source link http://python.jobbole.com/88325/#comment-94754#Coding:utf-8 fromLib2to3.pgen2.grammarImport Line__author__=' Hang'ImportWarningswarnings.filterwarnings ("Ignore")ImportJieba#Word breaker PackageImportNumPy#NumPy Calculation PackageImportReImportPandas as PDImportMa

Now it is time to review python keywords and symbols. The following lists some important python keywords and symbols. Based on your memory, first write down the functions of these keywords, and then go online to find out their actual usage. Some of them may be difficult to find, but you should keep trying. Write down the cards that you mistakenly remember, and wr

the form of return ' a ', [A, ' B '], ' C ' feeling like returning multiple values, in fact a tuple.94. The interactive mode is also a tuple>>>1,2,3>>> (1, 2, 3)95. The function does not have a clear indication of the return value. The return is None96. Return value 0->none 1->object >1->tuple97.def foo (a,*b,**c)The Declaration and definition of the 98.python function together99. Functions can also have attributes such as: __doc__100.

Main use of Wxpython (most mature cross-platform Python GUI toolkit) foreplay: Veteran python GUI program (Tkinter)Import Tkinter.messagebox asMessageBoxclassApplication (Frame): def __init__ (Self,master=None): frame.__init__ (SELF,MASTER,BG="Red") #设置框架类的父类 (based on master), frame can be considered as the parent container of the control Self.pack () #显示frame控件 self.createwidgets () def createwidgets (sel

Users'(name,fullname,password) VALUES (%s,%s,%s) ' cur.execute (sql, ("aaaaa","asd666" ,"6666"))#获取插入的最后一条数据的自增ID Print (CUR.LASTROWID) #只对一次增加一个可以直接看出, for adding multiple quantities at a time execute multiple SQL at one time='INSERT into Users (Name,fullname,password) VALUES (%s,%s,%s)'Cur.executemany (sql,[("aaadsaaa","Asd6dasd66","6666"),("adsaaaaa","asd6awf66","6666"),("awaaaaa","asd666","6666")]) Note that execute and Executemany will return the number of execution impact bars after exec

-------------------------------------------------------defBubblesort (list): forIinchReversed (range (Len (a))): forJinchRange (0,len (a)-1): if(List[j] > list[j+1]): Temp=List[j] List[j]=list[j+1] List[j+1]=Temp J+=1I-=1#Quick Sort-------------------------------------------------------defPartition (List,low,high): PivotKey=list[low]#Pivotlist[0]=List[low] whileLow#alternately scan from both ends of the table to the middle while(Low andlist[high]>=pivotkey): high-=1List[low]=l

插入的Key的顺序返回[‘z‘‘y‘‘x‘]OrderedDictYou can implement a FIFO (first-in-one-out) dict, deleting the first added key when the capacity exceeds the limit:　　 fromCollectionsImportordereddictclasslastupdatedordereddict (ordereddict):def __init__(self, capacity): Super (Lastupdatedordereddict, self).__init__() self._capacity=capacitydef __setitem__(self, Key, value): ContainsKey= 1ifKeyinchSelfElse0ifLen (self)-ContainsKey >=Self._capacity:last= Self.popitem (last=False)Print 'Remove:', lastifContainsKey