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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: File & Data Processing | 15% | - XML & JSON Parsing - Logging & System Interaction - CSV & Configuration Files - SQLite3 Database Operations |
| Topic 2: Advanced Object-Oriented Programming | 25% | - Attribute Access & Descriptors - Advanced Exceptions & Exception Chaining - Metaclasses & Metaprogramming - Shallow vs Deep Copy & Serialization - Abstract Base Classes - Multiple Inheritance & Mixins - Design Patterns |
| Topic 3: GUI Programming | 20% | - Dialogs & Application Structure - Event Handling & Callbacks - Event-Driven Paradigm - Tkinter Basics & Widgets |
| Topic 4: Network Programming | 18% | - REST API Basics - HTTP & Client-Server Communication - TCP/IP & Socket Programming - JSON/XML Data Exchange |
| Topic 5: Modules, Packages & Advanced Features | 10% | - Functional Programming Tools - Decorators & Context Managers - Import System & Namespaces |
| Topic 6: Coding Conventions, Best Practices & Standardization | 12% | - Pythonic Principles - Code Readability & Documentation - PEP 1, PEP 8, PEP 20, PEP 257 |
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68. Frage
Select the true statement related to PEP 257.
Antwort: B
Begründung:
Explanation
The true statement related to PEP 257 is Option B. According to PEP 257, string literals occurring elsewhere in Python code may also act as documentation. They are not recognized by the Python bytecode compiler and are not accessible as runtime object attributes (i.e. not assigned to doc), but two types of extra docstrings may be extracted by software tools: String literals occurring immediately after a simple assignment at the top level of a module, class, or init method are called "attribute docstrings". String literals occurring immediately after another docstring are called "additional docstrings"1.
69. Frage
Select the true statements about the json.-dumps () function. (Select two answers.)
Antwort: B,D
Begründung:
The json.dumps() function is used to convert a Python object into a JSON string 1 . It takes Python data as its argument, such as a dictionary or a list, and returns a JSON string.
Reference: Official Python documentation on json.dumps(): https://docs.python.org/3/library/json.html#json.
dumps
A). It returns a JSON string.
This statement is true because the json.dumps () function takes a Python object as its argument and returns a JSON-formatted string that represents the object. For example, json.dumps ([1, 2, 3]) returns '[1, 2, 3] '.
D). It takes Python data as its argument.
This statement is true because the json.dumps () function accepts any Python object that can be serialized into JSON, such as lists, dictionaries, strings, numbers, booleans, or None. For example, json.dumps ({"name":
"Alice", "age": 25}) returns '{"name": "Alice", "age": 25}'.
70. Frage
Which of the following constants will be used if you do riot define the quoting argument in the writer method provided by the csv module?
Antwort: D
Begründung:
Explanation
If you do not define the quoting argument in the writer method provided by the csv module, the default quoting behavior is set to QUOTE_MINIMAL. This means that fields containing special characters such as the delimiter or newline character will be quoted, while fields that do not contain special characters will not be quoted.
71. Frage
Select the true statements about the following invocation:
(Select two answers.)
Antwort: A,C
Begründung:
Explanation
It addresses a service deployed at localhost (the host where the code is run).
This statement is true because localhost is a special hostname that refers to the local machine or the current host where the code is run. It is equivalent to using the IP address 127.0.0.1, which is the loopback address of the network interface. By using localhost as the hostname, the invocation addresses a service that is deployed on the same machine as the client.
It addresses a service listening at port 3000.
This statement is true because port 3000 is the part of the URL that follows the colon after the hostname. It specifies the port number where the service is listening for incoming requests. A port number is a 16-bit integer that identifies a specific process or application on a host. By using port 3000, the invocation addresses a service that is listening at that port.
It addresses a service whose timeout is set to 3000 ms.
This statement is false because timeout is not a part of the URL, but a parameter that can be passed to the requests.get () function in Python. Timeout specifies how long to wait for the server to send data before giving up. It is measured in seconds, not milliseconds. By using timeout=3, the invocation sets the timeout to 3 seconds, not 3000 ms.
It addresses a service located at the following address local.host.com.
This statement is false because local.host.com is not the same as localhost. Local.host.com is a fully qualified domain name (FQDN) that consists of three parts: local, host, and com. It requires DNS resolution to map it to an IP address. Localhost, on the other hand, is a special hostname that does not require DNS resolution and always maps to 127.0.0.1. By using localhost as the hostname, the invocation does not address a service located at local.host.com.
References:
https://docs.python.org/3/library/requests.html : https://en.wikipedia.org/wiki/Localhost :
https://en.wikipedia.org/wiki/Port_(computer_networking) :
https://en.wikipedia.org/wiki/Fully_qualified_domain_name
72. Frage
If w is a correctly created main application window, which method would you use to foe both of the main window's dimensions?
Antwort: B
Begründung:
C). w.resizable()
The resizable() method takes two Boolean arguments, width and height , that specify whether the main window can be resized in the corresponding directions. Passing False to both arguments makes the main window non-resizable, whereas passing True to both arguments (or omitting them) makes the window resizable.
Here is an example that sets the dimensions of the main window to 500x400 pixels and makes it non-resizable:
import tkinter as tk
root = tk. Tk ()
root. geometry ( "500x400" )
root. resizable (False, False)
root. mainloop ()
References:
Tkinter documentation: https://docs.python.org/3/library/tk.html
Tkinter tutorial: https://www.python-course.eu/python_tkinter.php
The resizable () method of a tkinter window object allows you to specify whether the window can be resized by the user in the horizontal and vertical directions. You can pass two boolean arguments to this method, such as w.resizable (False, False), to prevent both dimensions from being changed. Alternatively, you can pass 0 or 1 as arguments, such as w.resizable (0, 0), to achieve the same effect 1 .
References:
1 : https://stackoverflow.com/questions/36575890/how-to-set-a-tkinter-window-to-a-constant-size Other methods that can be used to control the window size are:
w.geometry () : This method allows you to set the initial size and position of the window by passing a string argument in the format "widthxheight+x+y", such as w.geometry ("500x500+100+100") 1 2 .
w.minsize () and w.maxsize (): These methods allow you to set the minimum and maximum size of the window in pixels, such as w.minsize (500, 500) and w.maxsize (1000, 1000) 1 2 .
w.pack_propagate () and w.grid_propagate (): These methods allow you to enable or disable the propagation of the size of the widgets inside the window to the window itself. By default, these methods are set to True, which means that the window will adjust its size according to the widgets it contains. You can set these methods to False or 0 to prevent this behavior, such as w.pack_propagate (0) or w.grid_propagate (0).
w.place (): This method allows you to place the window at a specific position and size relative to its parent window or screen. You can use keyword arguments such as x, y, width, height, relx, rely, relwidth, and relheight to specify the coordinates and dimensions of the window in absolute or relative terms, such as w.
place (x=0, y=0, relwidth=1, relheight=1).
References:
2 : https://stackoverflow.com/questions/25690423/set-window-dimensions-in-tkinter-python-3 :
https://stackoverflow.com/questions/36575890/how-to-set-a-tkinter-window-to-a-constant-size
/36576068#36576068 : https://www.skotechlearn.com/2020/06/tkinter-window-position-size-center-screen-in- python.html
73. Frage
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