surf cookbook

(); } thread.interrupt (); }}In this example, we use the exception mechanism to achieve the purpose of terminating the thread. You run the sample program, and the program begins to traverse the directory and look for a specific file. Once the thread has checked itself out, it throws a Interruptedexception exception and continues executing the code of the Run () method, with multiple layers of recursive calls having no real effect on the result.The sleep () method in the Java Concurrency API

1 ImportCSV2 3filename ='Ch02-data.csv'4data = []5 6 Try:7with open (filename) as f://binding a data file to an object F with the WITH statement8Reader =Csv.reader (f)9Header = Next (reader)//python 3. X is for next ()Tendata = [row forRowinchReader] One exceptCSV. Error as E: A Print('Error reading CSV file at line%s:%s'%(reader.line_num,e)) -Sys.exit (-1) - the ifHeader: - Print(header) - Print("=======================") - forRowinchData: + Print(ROW)Python Data Visualization

methods, one is to apply a lookup table to stretch the histogram (some of the intensity values are not being exploited), and the other is to equalize the histogram (balanced use of all available pixel strength values).//Lookup Table Functions StaticMat Applylookup (ConstMat image,ConstMat lookup) {Mat result; LUT (image, lookup, result); returnresult; } //increase the contrast of an image by looking up a tableMat Stretch (ConstMat image,intMinValue =0) {Mat hist=Gethistogram

button click.Every element of MVC works separately. You can replace the push button with a toggle switch without changing your model and controller. The program still runs the same way as before, but there are some different things that appear in the interface. Or you can change the response of the button in your program without changing the interface. Separating these elements allows you to create a maintainable, rapidly updated program element.The MVC example class in the iphone:The @ View vi

,b):....: iftype (a) ==types. Tupletype:....:iflen (a) >1:....:Nbsp;a=mdot (*a) ....: else:....: a=a[0]....:iftype (b) == types. Tupletype:....:iflen (b) >1:....: b=mdot (*b) ....:else: ....:b= b[0]....:returnnp.dot (a,b) .....: In[16]:mdot (b, ((a,b), a)) Out[16]:array ([[120,188, 256],[438,688,938], NBSP;NBSP;NBSP;[NBSP;756,NBSP;1188,NBSP;1620]]) in[17]:aout[17]:array ([[0,1,2], NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;[3,NBSP;4,NBSP;5]]) in[18]:bout[18]:array ([[0,1], NBSP;NBSP;NBSP;NBSP;NBSP;NB

", "#888888", "#999999", "#AAAAAA", "#BBBBBB"))If you want to remove the legend on the right, use the Guide=falseGgplot (Meanmonthstep, AES (X=month, Y=step, fill=month)) +Geom_bar (stat= "Identity", color= "black") +Scale_fill_manual (Values=c ("#111111", "#222222", "#333333", "#444444", "#555555", "#666666","#777777", "#888888", "#999999", "#AAAAAA", "#BBBBBB"), Guide=false)Add text labelGgplot (Meanmonthstep, AES (X=month, Y=step)) +Geom_bar (stat= "Identity", fill= "LightBlue", color= "black

Task: Some module-level variables (such as named constants) need to be defined, and the customer Code cannot re-bind them; Solution: #coding = utf-8class _const(object): class ConstError(TypeError): pass def __setattr__(self,name,value): if name in self.__dict__: raise self.ConstError,"Can‘t rebind const(%s)" % name self.__dict__[name] = value def __delattr__(self,name): if name in self.__dict__: raise self.ConstError,"Can‘t unbind const(%s)" %

Task: A "Progress indicator" is displayed to the user during the operation at the specified time ". Solution: # Coding = utf-8import sysclass progressbar (object): def _ init _ (self, finalcount, block_char = '. '): Self. finalcount = finalcount self. blockcount = 0 self. block = block_char self. F = sys. stdout if not self. finalcount: return self. f. write ('\ n -------- % process ------- 1 \ n') self. f. write ('1 2 3 4 5 6 7 8 9 0 \ n') self. f. write ('0 0 0 0 0 0 0 0 0 \ n') def progress (

A small problem in the iOS7 programming Cookbook example 15.8 The title of the 15.8 example in this book is Editing Videos on an iOS Device. The code function is to create a UIImagePickerController view that allows users to select a video file from the photo gallery and then edit the video in the UIVideoEditorController view, finally, get the path of the edited video file. It is very easy, but in the actual running code, it is found that when UIIma

ImageThe Background-position property contains two values, separated by commas. The first value determines the coordinates of the point on the x-axis, and the second value determines the coordinates on the y-axis. If only one value is given, then it represents the horizontal position, in which case the vertical position is set to 50%. Setting Background-position to 50% means placing the picture in the center of the browser window. 0% and 100%, respectively, place the picture in the upper-left an

expression, such as the equals sign, plus sign, and valuetokens = [(' NAME ', ' foo '), (' EQ ', ' = '), (' NUM ', ' * '), (' PLUS ', ' + '),(' num ', ' a '), (' Times ', ' * '), (' Num ', 10 ')]The code we tried is as followsPattern_try ():/* First define each matching pattern */R ' (? pR ' (? pR ' (? pR ' (? pR ' (? pR ' (? p/* Then summarize all the regular expressions */Master_pat = Re.compile (' | '). Join ([NAME, NUM, PLUS, Times, EQ, WS]))/* string scanning using scanner */Scanner = Mast

',' Tuesday ',' Wednesday ', ' Thursday ' ,' Friday ',' Saturday ',' Sunday ']Start_date=datetime.today ()#weekday的作用是得出当日在这周中的索引. For example, the Monday to Sunday indexes wereDay_num=start_date.weekday ()#得到目标日期的索引Day_num_target=weekdays.index (Dayname)#求得日期的差距, if the gap is 0, then days_ago=7, that's exactly one weeks apart.days_ago= (7+day_num-day_num_target)%70:days_ago=7Target_date=start_date-timedelta (days=days_ago)Target_date__name__==' __main__ ':#找到上一个周一的时间Get_previous_day (' Monday

,elem.text Since Iterparse is able to scan the elements and get the corresponding text. Then we can convert this function to a builder. The code is modified as follows: defXml_try (Element):Tag_indicate=[]Doc2=iterparse (R ' D:\test_source\rss20.xml ',(' Start ',' End ')) forevent,elem in doc2: if event = = ' start ' : Tag_indicate.append ( Elem.tag) if event = = ' end ' : if tag_indicate.pop () = = element: yield Elem.text __name__==' __main__

follows:E:\python2.7.11\python.exe e:/py_prj/python_cookbook/chapter5.pyCall Decorator_tryCall ExampleWrapperThe result of example.__name__ here is wrapper, not example. That is, the properties of the modified function have changed. Because the adorner can be equivalent to write Example=decorator_try (example). The return value of Decorator_try is wrapper. So the example attribute is then changed to wrapper. To eliminate this effect, we need to use wraps.After modifying the wrapper with wraps,

/her advice.Remember one point: we can not be a master, but definitely can not tell the interviewer we are a rookie, at least to come up with some skills to prove.First off: Pen test iOS basic C + + pen question OBJC Basic Pen Question collection one OBJC Basic Pen Question collection two Treasure trove of iOS development pen questions To leave the company iOS pen questions iOS Advanced pen Question one iOS Advanced pen Question two Nanjing Jingdong Pen Quest

a success to see when the value2 is assigned. In the same way, we can use __setattr__ to prevent subsequent assignments of properties that are already in the class: classGet_try ():def__init__(Self, value):Self. value=valuedef__getattr__(Self, item): Self. Value=itemdef__getattribute__(Self, item):PrintItemdef__setattr__(Self, key, value):offKeyinchSelf.__dict__: Print ' already exist 'else :self. __dict__[Key]=valueif __name__ = = "__main__":G=get_try (' value ')G.value=4g.value1=3Print

1. The default parameters of the function must be immutableIf the default parameter of a function is a mutable object, then the default parameter is modified outside the function and affects the function itself.def spam (A, b=None): # B to be an immutable parameter, you cannot use a variable parameter such as an empty list [] ... if is None: ... = []...2. Anonymous functions1. You can use anonymous functions when you can't think of a function name or want a short operationLambda

Cat/etc/issueCat/etc/redhat-release rpm-qa| grep releaseView versionUname-a-i-r View kernel versionYum Grouplistlang=enYum grouplist This command to list all installed and not installed packagesReboot;init 6 Shutdown-r now offSingle-run mode change passwordpasswd Change PasswordRestart linux,3 seconds, press ENTER. If you have a grub password, you need to press P first, enter the password before you can do the followingPress E, select the second row, and then press eadd single or number 1 or let

string-S: Replace duplicate characters!Example: [Root @test/root]# Last | TR ' [A-z] ' [A-z] ' [Root @test/root]# cat/etc/passwd | Tr-d: [Root @test/root]# Cat/home/test/dostxt | Tr-d ' \ r ' > Dostxt-nomSplitSyntax: [Root @test/root]# split [-BL] input file output file leading characterParameter description:-B: Divide by file size-L: divided by the number of rowsExample: [Root @test/root]# split-l 5/etc/passwd test Description: It's a lot easier under Linux! If you want to split the file, then

14.10 re-throw the caught exception?You caught an except exception in a block and now want to re-throw it.Solution?Simply use a single rasie statement, for example:>>>DefExample():...Try:...int ( ' n/a ' ) ... except valueerror: ... print ( "didn ' t work" ) ... raise ... >>> example () didn ' t work traceback (most recent call last): File "1, in span class= "n" > "3, in Examplevalueerror: invalid literal for int. () with base: ' N/a ' > >> Discuss?The problem is usually when y