: \ Python35"
Iv. Existing Problems
It can be seen that only python 3.xis configured in the current path environment variable, and the default python command is also python 3.x.
Therefore, we have two solutions:
Configure the environment variables of
This chapter is based primarily on the tutorial simplification of the Python manual (shipped with Python). Have time to view the official original document. You can also find manual when you encounter a module or function that is not clear. Built-in data Types
As with most dynamic languages, a variable in Python is a d
Python learning notes (10) Python collection (3) and python learning notes
Set operation
Relationship between elements and sets
The relationship between elements and a set is to determine whether an element is a member of a set. "A" in aset
1 >>> s = set ([1, 2, 3, 4]) 2 >>>
Python's 6 basic data types--dictionariesDictionarydefinition and characteristics of dictionariesA dictionary is the only type of mapping in the Python language. definition : {key1:value1,key2:value2}
1、
键与值用冒号":"分开;
2、项与项用逗号","分开;
features :
1.key:value结构
2.key必须可hash、且必须为不可变数据类型、必须唯一(数字、字符串、元组)
3.value可存放任意多个值、可修改、可以不唯一
storage directory
tar zxvf apr-1.5.2.tar.gz #decompress
cd apr-1.5.2 #Enter the installation directory
./configure --prefix = / usr / local / apr #Configure
make #compile
make install #install
2.Install apr-util
cd / usr / local / src
tar zxvf apr-util-1.5.4.tar.gz
cd apr-util-1.5.4
./configure --with-apr = / usr / local / apr / bin / apr-1-config
make
make install
3.Install scons
cd / usr / local / src
tar zxvf scons-2.3.5.tar.gz
cd scons-2.3.5
A pit, don't know why, just record it.1 while loop! = 0:2 // omit operation 3 print loop4 if loop = = 0:5 print (ID (loop))6 print (ID (0))Running results in Python 2.7Skip loop printing with loop not 003809311234396768Running results in Python 3
("\ t" + topping)--------------------------------------------------------------------------------------------------------------- ---You ordered a thick-crust pizza with the following toppings:MushroomsExtra cheeseA For loop on the dictionary, looping the elements of the list in the dictionary again-------------------------------------------------------------------------------Favorite_languages = {' Jen ': [' python ', ' Ruby '],' Sarah ': [' C '],' E
In the busy schedule to write a tutorial for everyoneReally busy Ah, 4 chinese group = 1 program pits + 1 Polishing pits + 2 translation pits .....So the first sentence of this article is:so simple game to what tutorial, not counting loadgame,10 minutes to get started! Have time to go to the game of ChineseArtificial 3 I'm studying one night.By the way, the trans
Pyinlne
PyPy
Pyrex
These packages have different roles and methods of execution. For example, Pyrex allows Python to handle some memory tasks easily and efficiently; Pyinline can directly let you use C code in Python applications, although inline code is compiled separately, but if you can use C code efficiently, it can handle everything in one place.2. Use keyword sortingThere are many ol
(len (LST)-i-2,i,-1): #If the front size is small then the swap position ifLst[n-1] >Lst[n]: lst[n-1],lst[n] = lst[n],lst[n-1] BF=TruePrint("left Bubble First%s [%s]:%s,[%s]:%s compare swap%s"% (9-n-i,n-1,lst[n],n,lst[n-1],lst))Else: Print("left bubble first%s times [%s]:%s,[%s]:%s comparison invariant%s"% (9-n-i,n-1,lst[n-1],n,lst[n],lst))if notBF: BreakPrint("\ r \ n Sort after:%s"% LST)Output Result:E:\python\algorithm>Py
.
>>> tuple1 = (1,2,3)>>> tuple1(1, 2, 3)>>> tuple(list('hello'))('h', 'e', 'l', 'l', 'o')>>>
Iv. Summary
This chapter summarizes the list and metadata in the basic Python tutorial. net. for example, the wonderful slicing operation is actually simplified. the addrang and revomeall methods in. net. indeed, as mentioned in the book,
The probability that the program can be completed once and run normally is very small, not more than 1%. There will always be a variety of bugs to fix. Some bugs are simple, look at the error message and know that some bugs are complicated, we need to know which variables are correct, and which values are wrong, so a full set of debug programs is required to fix the bug.Method One: Print () the variables that may be problematic to see1 defFoo (s):2n =Int (s)
I wrote a new tutorial in my busy schedule.
It's really very busy. Four Chinese groups = one program pit + one retouching pit + two translation pits .....
So the first sentence of this article is:
What tutorials are required for such a simple game, not loadgame? Get started in 10 minutes! Time to go to Chinese games
AI 3 I studied for one night.
By the way, the translation of this game is also a headache fo
I wrote a new tutorial in my busy schedule.
It's really very busy. Four Chinese groups = one program pit + one retouching pit + two translation pits .....
So the first sentence of this article is:
What tutorials are required for such a simple game, not loadgame? Get started in 10 minutes! Time to go to Chinese games
AI 3 I studied for one night.
By the way, the translation of this game is also a headache fo
Ython is a very cool language, because very few Python code can do a lot of things in a short time, and Python can easily support multitasking and multiprocessing.Python's critics claim that Python performance is inefficient and slow to perform, but it is not: try the following 6 tips to speed up your
on a data processing, Keras provides imagedatagenerator functions to achieve data augmentation, DataSet amplification, the image to do some elastic transformation, such as horizontal flipping, vertical flipping, rotation and so on.
ModelsThis is the main module, the model. The above defines a variety of basic components, model is to combine them, the following is illustrated by an example.
3. One example: classified by CNN Mnist
Data downloadM
Reply content:Let me correct and comment.
> 1. Print is no longer a statement, but a function, such as the original print ' ABC ' is now print (' abc ')
However, python2.6+ can use the from __future__ import print_function to achieve the same functionality
> 2. In Python 3, there is no old-fashioned class, only the new class, which means no more like this class Foobar (object): Pass explicitly sub-class obj
The implementation of the tutorial GIF animation is shown by drawing pictures in different time periods quickly, because the human eye has 0.1 seconds of visual retention, so the image looks like a move.And each picture is called "frame", it is the basic unit that composes the animation. GIF animation for the Web page to add a lot of lively, complex and changeable graphic elements, so GIF animation in the production of web pages are widely used, and e
corresponding to the pycodeobject and stack frame corresponding f_globals build Pyfunctionobject object, and then through Store_ The name Directive associates the Pyfunctionobject object with the function name F and stores it in the local namespace. The corresponding pycodeobject of function f can be obtained and viewed by co.co_consts[0].inch[1]: Source = open (' func.py '). Read ()inch[2]: Import Disinch[3]: CO = Dis.dis (source,' func.py ',' EXEC
!" "}Return Json.dumps (res, ensure_ascii=false)Server.run (port=8989,debug=true) #启动服务, this need to note that after starting the service if the modified script to run a direct restart, you can not click the right button again to run, otherwise the interface conflict will be reported, because the original running service does not stop5 modifying ExcelImport xlrdFrom xlutils import Copy #修改excel需要导入该模块Book1 = Xlrd.open_workbook (' Ex.xls ') #1, open the original ExcelNew_book = Copy.copy (Book1)
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