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- 2.3 A small lexicon of widgets - Part 3 @info:cursos:pue:python-pcpp1:m3
- ain menu item: an empty (as far) submenu sub_menu_file = tk.Menu(main_menu) main_menu.add_cascade(label="File", menu=sub_menu_file) # 2nd main menu item: a simple callback sub_menu_help = tk.Menu(main_menu) main_... at strange dashed line visible when you click the File main menu item? Don’t worry, this it’s normal. W
- 3.1 The CSV module in Python @info:cursos:pue:python-pcpp1:m5
- parated Values) format is one of the most popular file formats used to store and transfer data between d... r data import and export in this format. The CSV file is a plain text file with the .csv extension. A typical file contains comma-separated values, but other separators such as s
- 4.2 Serialization of Python objects using the pickle module @info:cursos:pue:python-pcpp1:m1
- ay to persist outcomes is to generate a flat text file and to write your outcomes. It’s a very simple th... e into a stream of bytes to store the object in a file or database, or to transmit it via a network. Thi... u run the code presented in the right pane, a new file should be created. Remember to run the code local... 100, 1000]] with open('multidata.pckl', 'wb') as file_out: pickle.dump(a_dict, file_out) pickle
- 5.1 The configparser module @info:cursos:pue:python-pcpp1:m5
- e. A better solution is to use the configuration file, which will be read by the code. In Python, this ... t familiarize ourselves with the structure of the file in which they're stored. Are you curious how this is done? == What does the configuration file look like? The structure of the configuration file is very similar to Microsoft Windows INI files. It c
- 4.1 Logging in Python @info:cursos:pue:python-pcpp1:m5
- ifferent places. Most often it's in the form of a file, but it can also be an output stream, or even an ... ging logging.basicConfig(level=logging.CRITICAL, filename='prod.log', filemode='a') logger = logging.getLogger() logger.critical('Your CRITICAL message') l... ur DEBUG message')</code> Result in ''prod.log'' file: <code>CRITICAL:root:Your CRITICAL message</code>
- 2.1 File processing - XML files @info:cursos:pue:python-pcpp1:m5
- = 2.1 File processing - XML files == XML processing in Python Python is commonly used to process various types of ... programmer, you'll have to read or create a data file in the XML format. Soon, doing that will be a pie... ta></code> == XML parsing (part 1) Processing XML files in Python is very easy thanks to the ''ElementTr
- 3.1 Advanced techniques of creating and serving exceptions @info:cursos:pue:python-pcpp1:m1
- re you get data from an external source (console, file, etc.) you should not trust the data types, so it... e imported; * path – represents the path to any file which triggered the exception, respectively. Coul... de ; output> Traceback (most recent call last): File "exceptions#030.py", line 6, in <module> prin... n occurred: Traceback (most recent call last): File "exceptions#030.py", line 8, in <module> prin
- 1.7 Four magic letters: CRUD @info:cursos:pue:python-pcpp1:m4
- a simple relational database residing in a single file, or on the contrary, a huge, distributed cloud of... ction of retro cars written down in the cars.json file (Download ''cars.json'' zip file); the ''json-server'' will read the file in and will handle its contents according to our actions; *
- 1.6 Making life easier with the requests module @info:cursos:pue:python-pcpp1:m4
- wnload, download and run the Windows installer (a file with a name that looks like ''node-vxx.yy.z-x86.m... ps://nodejs.org/en/download, download the ''pkg'' file and run the installer. Whole process looks the sa... Do the following actions: * download the JSON file cars.json from here: Download {{ :info:cursos:pue... h>json-server --watch cars.json</code> Note: the file name you put after ''–-watch'' should be specifie
- 1.5 What is XML and why do we prefer to use JSON? @info:cursos:pue:python-pcpp1:m4
- ced by MS Office applications (the newer one with file extensions ending with x like docx) utilizes XML ... to this line, a program responsible for parsing a file’s content is calm about the future. It knows what... n needed about it is its URI (which may be just a file name recognizable by the target server); * the ... you to create, write, read, parse, and modify XML files. Most of them treat an XML document as a tree co
- 4.3 Making Python objects persistent using the shelve module @info:cursos:pue:python-pcpp1:m1
- de by the order of all the elements placed into a file or database, or sent via a network. There is ano... rings. Therefore, you can open your shelved data file and access your pickled objects via the keys the ... priate module and create an object representing a file-based database: <code python> import shelve my_sh... shelve.close() </code> Now let's open the shelve file to demonstrate direct access to the elements (con
- 3.1 PEP 8 – Introduction @info:cursos:pue:python-pcpp1:m2
- all pycodestyle </code> * You can run it on a file or files to obtain information about non-conformance (and indicate errors in the source code and their ... khanov which lets you paste your code or upload a file, and validate it against the PEP 8 style guidelin... length, line breaks, and blank lines; * source file encoding and module imports. === Indentation The
- 4.1 PEP 257 – Docstring Conventions @info:cursos:pue:python-pcpp1:m2
- gs in the module docstring of the %%__init__%%.py file in the package folder. As we've said before, doc... ings (in the sense of stand-alone programs/single file executables) should document the script's functio... , command line syntax, environment variables, and files. The description should be balanced in a way tha... e installation guidelines; * an **examples.py** file, which is a script that demonstrates a few exampl
- 1.1 SQLite @info:cursos:pue:python-pcpp1:m5
- ows the user to read and write data directly to a file. You're surprised? The complete SQLite database is stored in only one file. Unlike other database management systems, SQLite... s a self-contained library enclosed in one source file. SQLite also supports transactions, which are a s... ing software for cars and airplanes. The database file is cross-platform, which means it can be copied b
- 2.4 Shaping the main window and conversing with the user @info:cursos:pue:python-pcpp1:m3
- .tk.call('wm', 'iconphoto', window._w, PhotoImage(file='logo.png')) window.bind("<Button-1>", lamb... PhotoImage'' class constructor to convert the PNG file into an internal ''tkinter'' representation (''Ph... .tk.call('wm', 'iconphoto', window._w, PhotoImage(file='logo.png')) window.bind("<Button-1>;", lambda e:... ter as tk window = tk.Tk() photo = tk.PhotoImage(file = 'logo.png') window.wm_iconphoto(False, photo) w