rp cookbook

',' 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

), which provides CLI programs with a virtual machine environment that uploads and runs managed code on a variety of possible platforms, is just a specification, for example, Microsoft and Momo have their own implementations. The JIT and GC of the CLR for net should fall into this scope.The. NET Framework is a Microsoft implementation of the CLI, and, of course, the best implementation of the present, the. NET Framework mainly includes the CLR and the BCL,CLR is the core of the implementation of

operation time complexity is O (log N), where n is the size of the heap, so even when N is very large, they are still running fast. In the above code, the queue contains a tuple (-priority, index, item). The goal of a negative priority is to make the element sort from highest to lowest priority. This sort of heap is the opposite of regular sort by priority from low to high. The role of the index variable is to ensure that the same priority elements are sorted correctly. By saving an ever-increa

a Python object to the corresponding C parameter.This section of code uses Python's caching protocol to match any input parameter that looks like a double-precision array(such as numpy arrays, arrays created by array modules, etc.), refer to section 15.3 for more information.Inside the TYPEMAP code, variable substitution such as $ and $ will get the C parameter value of Typemap mode(for example, map to double*a ). $input point to a parameter as input PyObject* ,And $argnum it represents the num

;Fromllvm.eeImportExecutionengine>>>Engine=Executionengine.New(MoD)>>>Ptr=Engine.Get_pointer_to_function(F)>>>Ptr4325863440>>>Foo=cTYPES.Cfunctype(cTYPES.C_double,cTYPES.c_doublectypes. C_double) (ptr) >>> # Call the resulting Function>>> foo (23) 13.0>>> foo (4,5) Span class= "Go" >41.0>>> foo (1 ,2) 5.0>>> It's not that making any mistakes at this level will cause the Python interpreter to hang up.Remember that you are dealing directly with machine-level memory addresses and local machine c

1. Traversing a stringThere is no iterative operation in SQL, so you can implement this process by connecting a table that is used as a traversal pointer.1 Selectsubstr (E.ename, Iter.pos,1) asC2 from(SelectEname fromEmpwhereEname= 'KING') E,3(SelectId asPos fromT10) ITER4 whereIter.posLength (e.ename);There are 10 data in T10, ID from 1-10.The FROM clause provides a Cartesian product, and the resulting table resemblesThe WHERE clause restricts the POS range. SQL

En ~ After all, I learned how to do it in my spare time. VB. the code written in NET 2008 is mainly the VB6 code written by someone a few days ago. It runs well and can be changed to VB. NET 2008 is a bad thing. It runs well on the D325 U of the XP

Let's take a look at the effects of footer to be designed: 1. Create the footer component under the blog garden directory in the Masters panel area, click the "add master" icon, add a master, and rename it "footer ". 2. Double-click the

The problem: Each thing has three attributes, moral value A, threshold B, benefit C, if a>0, less than this threshold B can do this thing, the income C is negative, conversely, if the a Thought: Because the character value can be positive or

The first pro test is available: Licensee: Mi Yecheng (STUDENT) Key:nfmqbbveqdvbiujy8nziywirsg3yo+ptz8c9wdwxwse4wprphvsu9sohadpnnjk5 Licensee:university of Science and Technology of (classroom)

It is well known that before the Win8, Chinese users of the English input method of the switching mode has been: En for the default, and then use Ctrl+space switch en-Chinese main input method, with Ctrl+shift loop to switch all input methods. One

Windows 8 release Preview is no longer like Windows 7, and can be installed even if there is no serial number, but must be filled out as office 20120. Do you want to skip the step of entering the serial number to install Windows 8 release preview?