Python Institute PCPP-32-101 Fragen und Antworten, PCPP1 - Certified Professional in Python Programming 1 Prüfungsfragen

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Python Institute PCPP-32-101 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: GUI Programming	20%	- Graphical user interfaces with Tkinter 1. Widgets and layouts 2. User interaction 3. Application structure 4. Event handling
Topic 2: Python Standard Library and Best Practices	10%	- Advanced Python development 1. Code organization 2. Error handling and debugging 3. Using standard library modules 4. Professional programming practices
Topic 3: Multithreading and Concurrency	10%	- Concurrent programming 1. Synchronization mechanisms 2. Thread creation and management 3. Thread communication 4. Concurrency considerations
Topic 4: Advanced Object-Oriented Programming	25%	- Object-oriented concepts 1. Class and instance attributes 2. Inheritance and polymorphism 3. Encapsulation and abstraction 4. Method overriding and extension
Topic 5: File Processing and Serialization	15%	- Data storage and transfer 1. JSON processing 2. CSV handling 3. Pickle serialization 4. Persistent data management
Topic 6: Network Programming	20%	- Communication and networking 1. Socket programming 2. Network services 3. Protocols and data exchange 4. Client-server communication

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Python Institute PCPP1 - Certified Professional in Python Programming 1 PCPP-32-101 Prüfungsfragen mit Lösungen (Q55-Q60):

55. Frage
A socket object is usually created by which one of the following invocations?

A. socket = socket.socket(server address)
B. socket = socket. socket (socket_domain, socket_type, server_address)
C. socket = socket. socket (socket_number)
D. socket. socket (socket_domain, socket_type)

Antwort: D

Begründung:
Explanation
A socket object is usually created using the socket() constructor provided by the socket module in Python. The correct invocation is socket.socket(socket_domain, socket_type). This creates a new socket object with the specified socket domain and type.

56. Frage
Select the true statements related to PEP 8 naming conventions. (Select two answers.)

A. Modules should have short names written in CameICase.
B. Function and variable names should be lower-case with words separated by underscores.
C. Constants should be written in all lower-case letters with words separated by underscores
D. You should always use self as the first argument to instance methods, and cls as the first argument to class methods.

Antwort: B,C

Begründung:
Option A is true because PEP 8 recommends that function and variable names should be lowercase, with words separated by underscores .
Option D is true because PEP 8 recommends that constants should be written in all capital letters with words separated by underscores .
PEP 8 is the official style guide for Python code. It provides guidelines for how to write readable code that follows consistent naming conventions. The aim of PEP 8 is to improve the readability of Python code and make it easier to understand and maintain.
According to PEP 8, variable and function names should be written in all lower-case letters with words separated by underscores, as stated in A. Constants, which are variables whose value is expected to remain constant throughout the code, should be written in all upper-case letters with words separated by underscores, as stated in D.
References:
PEP 8 -- Style Guide for Python Code: https://www.python.org/dev/peps/pep-0008/ Python Documentation: https://docs.python.org/3/tutorial/classes.html#classmethods-and-staticmethods

57. Frage
Look at the following code snippets and decide which ones follow PEP 8 recommendations for whitespaces in expressions and statements (Select two answers.) A) No whitespace immediately before the opening parenthesis that starts the list of arguments of a function call:

B)
A whitespace immediately before a comma, semicolon, and colon:

C)
No whitespace between a trailing comma and a following closing parenthesis:

D)
A whitespace immediately after the opening parenthesis that starts indexing or slicing:

A. Option D
B. Option B
C. Option A
D. Option C

Antwort: C,D

Begründung:
Option A is true because PEP 8 recommends avoiding extraneous whitespace immediately inside parentheses, brackets or braces 1 .
Option C is true because PEP 8 recommends avoiding extraneous whitespace between a trailing comma and a following close parenthesis 1 .

58. Frage
Select the true statements about the connection-oriented and connectionless types of communication. (Select two answers.)

A. Using walkie-talkies is an example of a connection-oriented communication
B. In the context of TCP/IP networks, the communication side that initiates a connection is called the client, whereas the side that answers the client is called the server
C. A phone call is an example of a connection-oriented communication
D. Connectionless communications are usually built on top of TCP

Antwort: B,C

Begründung:
A). In the context of TCP/IP networks, the communication side that initiates a connection is called the client, whereas the side that answers the client is called the server.
This statement is true because TCP/IP networks use a client-server model to establish connection-oriented communications. The client is the device or application that requests a service or resource from another device or application, which is called the server. The server responds to the client's request and provides the service or resource. For example, when you browse a website using a web browser, the browser acts as a client and sends a request to the web server that hosts the website. The web server acts as a server and sends back the requested web page to the browser 1 .
B). Connectionless communications are usually built on top of TCP.
This statement is false because TCP (Transmission Control Protocol) is a connection-oriented protocol that requires establishing and terminating a connection before and after sending data. Connectionless communications are usually built on top of UDP (User Datagram Protocol), which is a connectionless protocol that does not require any connection setup or teardown. UDP simply sends data packets to the destination without checking if they are received or not 2 .
C). Using walkie-talkies is an example of a connection-oriented communication.
This statement is false because using walkie-talkies is an example of a connectionless communication. Walkie- talkies do not establish a dedicated channel or connection between the sender and receiver before transmitting data. They simply broadcast data over a shared frequency without ensuring that the receiver is ready or available to receive it. The sender does not know if the receiver has received the data or not 3 .
D). A phone call is an example of a connection-oriented communication.
This statement is true because a phone call is an example of a connection-oriented communication. A phone call requires setting up a circuit or connection between the caller and callee before exchanging voice data. The caller and callee can hear each other's voice and know if they are connected or not. The phone call also requires terminating the connection when the conversation is over 4 .
References:
1 : https://www.techtarget.com/searchnetworking/definition/client-server 2 : https://www.javatpoint.com
/connection-oriented-vs-connectionless-service 3 : https://en.wikipedia.org/wiki/Walkie-talkie 4 : https://en.
wikipedia.org/wiki/Telephone_call
A is true because in the context of TCP/IP networks, the communication side that initiates a connection is called the client, and the side that answers the client is called the server. This is the basis for establishing a connection-oriented communication.
D is true because a phone call is an example of a connection-oriented communication. Like TCP/IP, a phone call establishes a connection between two devices (in this case, two phones) before communication can occur.
A is true because in the context of TCP/IP networks, the communication side that initiates a connection is called the client, and the side that answers the client is called the server. This is the basis for establishing a connection-oriented communication.
D is true because a phone call is an example of a connection-oriented communication. Like TCP/IP, a phone call establishes a connection between two devices (in this case, two phones) before communication can occur.
B is false because connectionless communications are usually built on top of UDP, not TCP. UDP is a connectionless protocol that does not establish a connection before sending data.
C is false because using walkie-talkies is an example of a connectionless communication. Walkie-talkies do not establish a connection before communication begins, and messages are simply broadcasted to all devices within range.
Here is a sample code in Python using the socket module to create a TCP server and client to demonstrate the connection-oriented communication:
Server-side code:
import socket
HOST = '127.0.0.1'
PORT = 8080
with socket. socket (socket.AF_INET, socket.SOCK_STREAM) as s:
s. bind ((HOST, PORT))
s. listen ()
conn, addr = s. accept ()
with conn:
print ( 'Connected by' , addr)
while True:
data = conn. recv ( 1024 )
if not data:
break
conn. sendall (data)
Client-side code:
import socket
HOST = '127.0.0.1'
PORT = 8080
with socket. socket (socket.AF_INET, socket.SOCK_STREAM) as s:
s. connect ((HOST, PORT))
s. sendall (b ' Hello, world ' )
data = s. recv ( 1024 )
print ( 'Received' , repr (data))
The server listens for incoming connections on port 8080, and when a connection is established, it prints the address of the client that has connected. The server then continuously receives data from the client and sends it back to the client until the connection is closed.
The client establishes a connection with the server and sends the message "Hello, world" encoded as bytes. It then waits for a response from the server and prints the data it receives.

59. Frage
In the JSON processing context, the term serialization:

A. names a process in which a JSON string is remodeled and transformed into a new JSON string
B. names a process in which a JSON string is turned into Python data.
C. refers to nothing, because there is no such thing as JSON serialization.
D. names a process in which Python data is turned into a JSON string.

Antwort: D

Begründung:
In the JSON processing context, the term serialization: A. names a process in which Python data is turned into a JSON string.
Serialization refers to the process of converting a data object, such as a Python object, into a format that can be easily transferred over a network or stored in a file. In the case of JSON, serialization refers to converting Python data into a string representation using the JSON format. This string can be sent over a network or stored as a file, and later deserialized back into the original Python data object.
Reference: Official Python documentation on json: https://docs.python.org/3/library/json.html#json- serialization

60. Frage
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