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- 2.7 Encapsulation @info:cursos:pue:python-pcpp1:m1
- r attributes **intentionally** as Python does not deliver true privacy. Why? Guido Van Rossum, best k... attribute, and before the method responsible for deleting the encapsulated attribute. Let's have look... ssible to set negative liquid level') @level.deleter def level(self): if self.__level ... ct has a ''%%__level%%'' attribute, and the class delivers the methods responsible for handling access
- 1.7 Four magic letters: CRUD @info:cursos:pue:python-pcpp1:m4
- hod. == To make our set complete, we need D for Delete. Deletion occurs when you remove your post from the blog, purge a picture from the gallery or cancel a customer’s account. At REST level, deleting existing data is implemented by the DELETE HTTP method. Now we’re ready to carry out some simpl
- 2.6 Abstract classes @info:cursos:pue:python-pcpp1:m1
- d **abstract methods**. * The programmer has to deliver all method definitions and the completeness w... ated by another, dedicated module. The programmer delivers the method definitions by __overriding__ the... code to be polymorphic, so all subclasses have to deliver a set of their own method implementations in ... ework your music player code, you’ll just have to deliver a class supporting the new file format, fulfi
- 2.9 Inheriting properties from built-in classes @info:cursos:pue:python-pcpp1:m1
- methods. Later, you can override the methods by delivering your own modifications for the selected me... ething that’s worth commenting on is that we have delivered: * a static, dedicated method for checking argument types. As we have delegated this responsibility to only one method, the... ction of elements to the object. What have we not delivered? * All the remaining methods have remain
- 4.1 Shallow and deep copy operations @info:cursos:pue:python-pcpp1:m1
- * is implemented by the ''deepcopy()'' function, delivered by the python 'copy' module {{ :info:cursos... lead you to the total weight details of the given delicacy. The input is presented in the editor; * P... then iterate over it to reduce the price of each delicacy by 20% if its weight exceeds the value of 30... w let's rework the code a bit: * introduce the Delicacy class to represent a generic delicacy. The o
- 1.1 SQLite @info:cursos:pue:python-pcpp1:m5
- ng a database structure; * inserting, updating, deleting, and searching data; * ensuring data secur... 0, 1)) c.commit() c.close() </code> == sqlite3 – deleting data After completing a task, we would like ... o do this, we must use the SQL statement called ''DELETE'': <code sql>DELETE FROM table_name WHERE condition;</code> Let's look at what removing the task wi
- 2.2 Inheritance and polymorphism — Inheritance as a pillar of OOP @info:cursos:pue:python-pcpp1:m1
- g, printing, and sending via fax. The methods are delivered by the following classes: * scan(), delivered by the Scanner class; * print(), delivered by the Printer class; * send() and print(), delivered by the Fax class. Each method should print
- 2.1 Python core syntax @info:cursos:pue:python-pcpp1:m1
- the core syntax are translated into magic methods delivered by specific classes. So Python knows what ... ed to the __len__() method. These methods must be delivered by a class (now it’s clear why we treat cla... __and__', '__bool__', '__ceil__', '__class__', '__delattr__', '__dir__', '__divmod__', '__doc__', '__eq... e look somehow familiar, so let's see the details delivered by Python itself. The Python help() functi
- 3.1 The CSV module in Python @info:cursos:pue:python-pcpp1:m5
- ='') as csvfile: reader = csv.reader(csvfile, delimiter=',') for row in reader: print(r... ='') as csvfile: reader = csv.reader(csvfile, delimiter=',') for row in reader: print('... ='') as csvfile: writer = csv.writer(csvfile, delimiter=',') writer.writerow(['Name', 'Pho... ='') as csvfile: writer = csv.writer(csvfile, delimiter=',', quotechar='"', quoting=csv.QUOTE_MINIM
- 4.3 Making Python objects persistent using the shelve module @info:cursos:pue:python-pcpp1:m1
- ith shelves in the pantry is a correct one. Looks delicious, doesn’t it? Using shelve is quite easy an... as when applied to a Python dictionary; * the ''del'' instruction, used to delete a key-value pair. After running the code, you'll notice additionally th
- 1.8 Interacting with widget methods @info:cursos:pue:python-pcpp1:m3
- t usable? Yes, it is, e.g., when you are going to delete the previously planned invocation from the man... as the application is running. Try to change the delay time (the first method’s argument) and check ho... event manager’s memory, as the widget’s object is deleted and becomes inaccessible. <code python> Widg
- 2.4 Shaping the main window and conversing with the user @info:cursos:pue:python-pcpp1:m3
- causes the event manager to run an event named ''<Delete>'', which enables the other widgets to react. ... in the following way: <code python> protocol("WM_DELETE_WINDOW", callback) </code> The sample shows o... .destroy() window = tk.Tk() window.protocol("WM_DELETE_WINDOW", really) window.mainloop() </code> U
- 1.3 JSON – our new friend @info:cursos:pue:python-pcpp1:m4
- difference – **you must not use apostrophes** to delimit the text. The only delimiter allowed is a quote, like here: <code ruby> "Python" </code> This mea... le, it uses square brackets (or just brackets) to delimit array content and uses commas to separate an
- 1.6 Making life easier with the requests module @info:cursos:pue:python-pcpp1:m4
- kages needed to run it, so you should expect some delay – be patient and issue the following command: <... erver something new, ''POST'' is ready to be your deliverer. * ''PUT'', similarly to ''POST'', transf... rrently keeping, ''PUT'' will know the way. * ''DELETE'' – this name leaves no doubt: it is used to o
- 3.1 Advanced techniques of creating and serving exceptions @info:cursos:pue:python-pcpp1:m1
- eve this, we could use the ''format_tb()'' method delivered by the built-in traceback module to get a l... ck. We could use the ''print_tb()'' method, also delivered by the traceback module, to print strings d