Python Programming Practice Exam

Question 1 Python Programming

What is a package?

They include + (addition), - (subtraction), * (multiplication), / (division), // (floor division), % (modulo), and ** (exponentiation). Strings are immutable: s[1:3] gets substring from index 1 to 3 (exclusive). Use step: s[::2]. Package is directory with __init__.py containing modules. Import as from pkg.module import func. for item in iterable: iterates over sequences like lists or range(). range(n) generates 0 to n-1.

Question 2 Python Programming

How do you write an if statement?

Use if condition: followed by indented block. Condition evaluates to boolean; non-empty/non-zero is truthy. Lists are mutable: mylist = [1, 2, 3]. Access via index: mylist[0]; negative for reverse. raise ValueError('message'). Used for custom error conditions. Dynamic typing means variable types are determined at runtime, not compile-time. A variable can hold different types sequentially, e.g., x = 5; x = 'hello'.

Question 3 Python Programming

What are elif and else?

while condition: repeats indented block while condition is truthy. Use with caution to avoid infinite loops. elif is else-if for additional conditions; else executes if no prior conditions match. They chain after if. Manages resources: with open() as f:. Custom via class with __enter__ __exit__ or @contextmanager. Lists are mutable: mylist = [1, 2, 3]. Access via index: mylist[0]; negative for reverse.

Question 4 Python Programming

How do you create and access lists?

Lists are mutable: mylist = [1, 2, 3]. Access via index: mylist[0]; negative for reverse. try: ... except ValueError: ... else: ... finally: .... Catches specific exceptions. Basic immutable types include int (integers), float (floating-point), str (strings), and bool (True/False). Mutable types include lists and dictionaries. for item in iterable: iterates over sequences like lists or range(). range(n) generates 0 to n-1.

Question 5 Python Programming

How does the print() function work?

Dicts map keys to values: d = {'key': 'value'}. Keys are immutable; access with d['key']. class MyClass: followed by methods. Instances created with obj = MyClass(). Functions wrapping others: @decorator def func():. Modify behavior without changing code, e.g., @staticmethod. print() outputs objects to stdout. It converts them to strings, with sep=' ' between arguments and end='\n' at the end.

Question 6 Python Programming

What is the value of None in Python?

None is a singleton object representing the absence of a value, often used as a default return for functions without explicit returns. Python features dynamic typing, automatic memory management, extensive standard library, and cross-platform compatibility. It emphasizes code readability with significant whitespace. REPL stands for Read-Eval-Print Loop, an interactive shell for executing Python code line-by-line. Access it by typing python in the terminal. F-strings format strings: f'Hello {name}'. Introduced in Python 3.6 for efficient interpolation.

Question 7 Python Programming

What is inheritance in Python?

Subclass: class Child(Parent):. Child inherits methods; override with same name. Variables are names that reference objects storing data. They are created on first assignment, like x = 5, and are dynamically typed. Tuples are immutable sequences: t = (1, 2, 3). Created with comma or parentheses; useful for fixed data. def __init__(self, args): is constructor called on instance creation. 'self' refers to instance.

Question 8 Python Programming

Explain generators.

*args packs extra positional args as tuple; **kwargs packs keyword args as dict. print() outputs objects to stdout. It converts them to strings, with sep=' ' between arguments and end='\n' at the end. Generators yield values lazily: def gen(): yield 1. Use next() or for loop; saves memory. Python is a high-level, interpreted programming language known for its readability and simplicity. It supports multiple paradigms including procedural, object-oriented, and functional programming.

Question 9 Python Programming

What are tuples?

Tuples are immutable sequences: t = (1, 2, 3). Created with comma or parentheses; useful for fixed data. Variables are names that reference objects storing data. They are created on first assignment, like x = 5, and are dynamically typed. Python features dynamic typing, automatic memory management, extensive standard library, and cross-platform compatibility. It emphasizes code readability with significant whitespace. Subclass: class Child(Parent):. Child inherits methods; override with same name.

Question 10 Python Programming

What are instance vs class variables?

Comparison operators like ==, !=, >, <, >=, <= return a boolean value: True or False. Python features dynamic typing, automatic memory management, extensive standard library, and cross-platform compatibility. It emphasizes code readability with significant whitespace. Methods include append(x), pop(), insert(i,x), remove(x), sort(), and reverse(). Instance vars unique per object (self.var); class vars shared (MyClass.var).

Question 11 Python Programming

How does exception handling work?

Functions wrapping others: @decorator def func():. Modify behavior without changing code, e.g., @staticmethod. try: ... except ValueError: ... else: ... finally: .... Catches specific exceptions. Define as def func(param=default):. Caller can omit if using default. Concise lists: [x*2 for x in range(5) if x%2==0]. Faster and readable than loops.

Question 12 Python Programming

What are lambda functions?

Python features dynamic typing, automatic memory management, extensive standard library, and cross-platform compatibility. It emphasizes code readability with significant whitespace. Anonymous functions: lambda x: x*2. Single expression, often for map(), filter(), sorted(). Concise lists: [x*2 for x in range(5) if x%2==0]. Faster and readable than loops. Lists are mutable: mylist = [1, 2, 3]. Access via index: mylist[0]; negative for reverse.

Question 13 Python Programming

How do you write to a file?

Save the code in a file with .py extension, then run python filename.py in the terminal. Use python3 if Python 2 is also installed. with open('file.txt', 'w') as f: f.write('text'). 'w' overwrites; 'a' appends. Anonymous functions: lambda x: x*2. Single expression, often for map(), filter(), sorted(). Lists are mutable: mylist = [1, 2, 3]. Access via index: mylist[0]; negative for reverse.

Question 14 Python Programming

What are f-strings?

Dynamic typing means variable types are determined at runtime, not compile-time. A variable can hold different types sequentially, e.g., x = 5; x = 'hello'. *args packs extra positional args as tuple; **kwargs packs keyword args as dict. input(prompt) reads a line from stdin, strips the newline, and returns it as a string. Use int() or float() to convert. F-strings format strings: f'Hello {name}'. Introduced in Python 3.6 for efficient interpolation.

Question 15 Python Programming

How do methods work in classes?

Dynamic typing means variable types are determined at runtime, not compile-time. A variable can hold different types sequentially, e.g., x = 5; x = 'hello'. Methods include append(x), pop(), insert(i,x), remove(x), sort(), and reverse(). Methods take 'self' first: def method(self):. Called as obj.method(). Subclass: class Child(Parent):. Child inherits methods; override with same name.

Question 16 Python Programming

What is the init method?

def __init__(self, args): is constructor called on instance creation. 'self' refers to instance. Subclass: class Child(Parent):. Child inherits methods; override with same name. with open('file.txt', 'r') as f: then f.read() or f.readlines(). 'with' auto-closes. Lists are mutable: mylist = [1, 2, 3]. Access via index: mylist[0]; negative for reverse.

Question 17 Python Programming

What are *args and **kwargs?

None is a singleton object representing the absence of a value, often used as a default return for functions without explicit returns. Logical operators are and (both true), or (either true), and not (negation). They short-circuit evaluate. *args packs extra positional args as tuple; **kwargs packs keyword args as dict. Methods take 'self' first: def method(self):. Called as obj.method().

Question 18 Python Programming

How do you import modules?

Asyncio for concurrency: async def func(): await asyncio.sleep(1). Runs non-blocking I/O. Guido van Rossum created Python, with the first version released in 1991. It was named after the British comedy series Monty Python. class MyClass: followed by methods. Instances created with obj = MyClass(). import module or from module import func. Standard lib: math, os, sys.

Question 19 Python Programming

What is the difference between parameters and arguments?

Use if condition: followed by indented block. Condition evaluates to boolean; non-empty/non-zero is truthy. Parameters are variables in function definition; arguments are values passed when calling. Keyword arguments use name=value. Define as def func(param=default):. Caller can omit if using default. Concise lists: [x*2 for x in range(5) if x%2==0]. Faster and readable than loops.

Question 20 Python Programming

What does input() return?

input(prompt) reads a line from stdin, strips the newline, and returns it as a string. Use int() or float() to convert. class MyClass: followed by methods. Instances created with obj = MyClass(). def __init__(self, args): is constructor called on instance creation. 'self' refers to instance. print() outputs objects to stdout. It converts them to strings, with sep=' ' between arguments and end='\n' at the end.

Question 21 Python Programming

What are common list methods?

Methods include append(x), pop(), insert(i,x), remove(x), sort(), and reverse(). *args packs extra positional args as tuple; **kwargs packs keyword args as dict. Parameters are variables in function definition; arguments are values passed when calling. Keyword arguments use name=value. Python is a high-level, interpreted programming language known for its readability and simplicity. It supports multiple paradigms including procedural, object-oriented, and functional programming.

Question 22 Python Programming

How do you convert data types in Python?

Package is directory with __init__.py containing modules. Import as from pkg.module import func. Use functions like int(), float(), str(), or bool(). For example, int('42') converts string '42' to integer 42. Comparison operators like ==, !=, >, <, >=, <= return a boolean value: True or False. Asyncio for concurrency: async def func(): await asyncio.sleep(1). Runs non-blocking I/O.

Question 23 Python Programming

How do you run a Python script from the command line?

REPL stands for Read-Eval-Print Loop, an interactive shell for executing Python code line-by-line. Access it by typing python in the terminal. Logical operators are and (both true), or (either true), and not (negation). They short-circuit evaluate. Save the code in a file with .py extension, then run python filename.py in the terminal. Use python3 if Python 2 is also installed. Comparison operators like ==, !=, >, <, >=, <= return a boolean value: True or False.

Question 24 Python Programming

What are sets in Python?

Sets are unordered collections of unique elements: s = {1, 2}. Support add(), remove(), union, intersection. while condition: repeats indented block while condition is truthy. Use with caution to avoid infinite loops. Dynamic typing means variable types are determined at runtime, not compile-time. A variable can hold different types sequentially, e.g., x = 5; x = 'hello'. Methods: upper(), lower(), strip(), split(), join(), find(), replace().

Question 25 Python Programming

How do you slice strings?

Methods take 'self' first: def method(self):. Called as obj.method(). break exits loop; continue skips to next iteration; pass is a no-op placeholder. Manages resources: with open() as f:. Custom via class with __enter__ __exit__ or @contextmanager. Strings are immutable: s[1:3] gets substring from index 1 to 3 (exclusive). Use step: s[::2].

Question 26 Python Programming

What are async and await?

class MyClass: followed by methods. Instances created with obj = MyClass(). Guido van Rossum created Python, with the first version released in 1991. It was named after the British comedy series Monty Python. F-strings format strings: f'Hello {name}'. Introduced in Python 3.6 for efficient interpolation. Asyncio for concurrency: async def func(): await asyncio.sleep(1). Runs non-blocking I/O.

Question 27 Python Programming

What are variables in Python?

Variables are names that reference objects storing data. They are created on first assignment, like x = 5, and are dynamically typed. print() outputs objects to stdout. It converts them to strings, with sep=' ' between arguments and end='\n' at the end. Strings are immutable: s[1:3] gets substring from index 1 to 3 (exclusive). Use step: s[::2]. F-strings format strings: f'Hello {name}'. Introduced in Python 3.6 for efficient interpolation.

Question 28 Python Programming

How do default parameters work?

Define as def func(param=default):. Caller can omit if using default. Instance vars unique per object (self.var); class vars shared (MyClass.var). try: ... except ValueError: ... else: ... finally: .... Catches specific exceptions. Use functions like int(), float(), str(), or bool(). For example, int('42') converts string '42' to integer 42.

Question 29 Python Programming

What do comparison operators return?

Comparison operators like ==, !=, >, <, >=, <= return a boolean value: True or False. Anonymous functions: lambda x: x*2. Single expression, often for map(), filter(), sorted(). Use functions like int(), float(), str(), or bool(). For example, int('42') converts string '42' to integer 42. Methods: upper(), lower(), strip(), split(), join(), find(), replace().

Question 30 Python Programming

What is a context manager?

F-strings format strings: f'Hello {name}'. Introduced in Python 3.6 for efficient interpolation. *args packs extra positional args as tuple; **kwargs packs keyword args as dict. They include + (addition), - (subtraction), * (multiplication), / (division), // (floor division), % (modulo), and ** (exponentiation). Manages resources: with open() as f:. Custom via class with __enter__ __exit__ or @contextmanager.

Question 31 Python Programming

How do you define a class?

*args packs extra positional args as tuple; **kwargs packs keyword args as dict. Subclass: class Child(Parent):. Child inherits methods; override with same name. Python features dynamic typing, automatic memory management, extensive standard library, and cross-platform compatibility. It emphasizes code readability with significant whitespace. class MyClass: followed by methods. Instances created with obj = MyClass().

Question 32 Python Programming

What is Python?

Python is a high-level, interpreted programming language known for its readability and simplicity. It supports multiple paradigms including procedural, object-oriented, and functional programming. def __init__(self, args): is constructor called on instance creation. 'self' refers to instance. while condition: repeats indented block while condition is truthy. Use with caution to avoid infinite loops. REPL stands for Read-Eval-Print Loop, an interactive shell for executing Python code line-by-line. Access it by typing python in the terminal.

Question 33 Python Programming

What do break, continue, and pass do?

Logical operators are and (both true), or (either true), and not (negation). They short-circuit evaluate. Strings are immutable: s[1:3] gets substring from index 1 to 3 (exclusive). Use step: s[::2]. Methods: upper(), lower(), strip(), split(), join(), find(), replace(). break exits loop; continue skips to next iteration; pass is a no-op placeholder.

Question 34 Python Programming

What are logical operators in Python?

elif is else-if for additional conditions; else executes if no prior conditions match. They chain after if. Use functions like int(), float(), str(), or bool(). For example, int('42') converts string '42' to integer 42. Manages resources: with open() as f:. Custom via class with __enter__ __exit__ or @contextmanager. Logical operators are and (both true), or (either true), and not (negation). They short-circuit evaluate.

Question 35 Python Programming

What are list comprehensions?

Python features dynamic typing, automatic memory management, extensive standard library, and cross-platform compatibility. It emphasizes code readability with significant whitespace. class MyClass: followed by methods. Instances created with obj = MyClass(). Concise lists: [x*2 for x in range(5) if x%2==0]. Faster and readable than loops. try: ... except ValueError: ... else: ... finally: .... Catches specific exceptions.

Question 36 Python Programming

What is the Python REPL?

REPL stands for Read-Eval-Print Loop, an interactive shell for executing Python code line-by-line. Access it by typing python in the terminal. Sets are unordered collections of unique elements: s = {1, 2}. Support add(), remove(), union, intersection. Manages resources: with open() as f:. Custom via class with __enter__ __exit__ or @contextmanager. Define as def func(param=default):. Caller can omit if using default.

Question 37 Python Programming

How do dictionaries work?

Methods: upper(), lower(), strip(), split(), join(), find(), replace(). Dicts map keys to values: d = {'key': 'value'}. Keys are immutable; access with d['key']. while condition: repeats indented block while condition is truthy. Use with caution to avoid infinite loops. Methods take 'self' first: def method(self):. Called as obj.method().

Question 38 Python Programming

Name key string methods.

Basic immutable types include int (integers), float (floating-point), str (strings), and bool (True/False). Mutable types include lists and dictionaries. Tuples are immutable sequences: t = (1, 2, 3). Created with comma or parentheses; useful for fixed data. Methods: upper(), lower(), strip(), split(), join(), find(), replace(). Instance vars unique per object (self.var); class vars shared (MyClass.var).

Question 39 Python Programming

What are decorators?

*args packs extra positional args as tuple; **kwargs packs keyword args as dict. Methods include append(x), pop(), insert(i,x), remove(x), sort(), and reverse(). Functions wrapping others: @decorator def func():. Modify behavior without changing code, e.g., @staticmethod. Dynamic typing means variable types are determined at runtime, not compile-time. A variable can hold different types sequentially, e.g., x = 5; x = 'hello'.

Question 40 Python Programming

Who created Python and when?

Package is directory with __init__.py containing modules. Import as from pkg.module import func. Comparison operators like ==, !=, >, <, >=, <= return a boolean value: True or False. They include + (addition), - (subtraction), * (multiplication), / (division), // (floor division), % (modulo), and ** (exponentiation). Guido van Rossum created Python, with the first version released in 1991. It was named after the British comedy series Monty Python.

Question 41 Python Programming

What are the basic data types in Python?

def __init__(self, args): is constructor called on instance creation. 'self' refers to instance. Strings are immutable: s[1:3] gets substring from index 1 to 3 (exclusive). Use step: s[::2]. Basic immutable types include int (integers), float (floating-point), str (strings), and bool (True/False). Mutable types include lists and dictionaries. Functions wrapping others: @decorator def func():. Modify behavior without changing code, e.g., @staticmethod.

Question 42 Python Programming

Explain dynamic typing in Python.

class MyClass: followed by methods. Instances created with obj = MyClass(). Python features dynamic typing, automatic memory management, extensive standard library, and cross-platform compatibility. It emphasizes code readability with significant whitespace. Dynamic typing means variable types are determined at runtime, not compile-time. A variable can hold different types sequentially, e.g., x = 5; x = 'hello'. They include + (addition), - (subtraction), * (multiplication), / (division), // (floor division), % (modulo), and ** (exponentiation).

Question 43 Python Programming

What does the return statement do?

Functions wrapping others: @decorator def func():. Modify behavior without changing code, e.g., @staticmethod. return value exits function and sends value back. Without it, returns None. Tuples are immutable sequences: t = (1, 2, 3). Created with comma or parentheses; useful for fixed data. input(prompt) reads a line from stdin, strips the newline, and returns it as a string. Use int() or float() to convert.

Question 44 Python Programming

What are the key features of Python?

Python features dynamic typing, automatic memory management, extensive standard library, and cross-platform compatibility. It emphasizes code readability with significant whitespace. Generators yield values lazily: def gen(): yield 1. Use next() or for loop; saves memory. Package is directory with __init__.py containing modules. Import as from pkg.module import func. *args packs extra positional args as tuple; **kwargs packs keyword args as dict.

Question 45 Python Programming

How do you define a function?

Lists are mutable: mylist = [1, 2, 3]. Access via index: mylist[0]; negative for reverse. Use def function_name(parameters): followed by indented body. Call with function_name(args). print() outputs objects to stdout. It converts them to strings, with sep=' ' between arguments and end='\n' at the end. Manages resources: with open() as f:. Custom via class with __enter__ __exit__ or @contextmanager.

Question 46 Python Programming

How do you open and read a file?

Use def function_name(parameters): followed by indented body. Call with function_name(args). Parameters are variables in function definition; arguments are values passed when calling. Keyword arguments use name=value. with open('file.txt', 'r') as f: then f.read() or f.readlines(). 'with' auto-closes. Dynamic typing means variable types are determined at runtime, not compile-time. A variable can hold different types sequentially, e.g., x = 5; x = 'hello'.

Question 47 Python Programming

Explain the for loop in Python.

Manages resources: with open() as f:. Custom via class with __enter__ __exit__ or @contextmanager. They include + (addition), - (subtraction), * (multiplication), / (division), // (floor division), % (modulo), and ** (exponentiation). def __init__(self, args): is constructor called on instance creation. 'self' refers to instance. for item in iterable: iterates over sequences like lists or range(). range(n) generates 0 to n-1.

Question 48 Python Programming

How does a while loop work?

while condition: repeats indented block while condition is truthy. Use with caution to avoid infinite loops. Strings are immutable: s[1:3] gets substring from index 1 to 3 (exclusive). Use step: s[::2]. with open('file.txt', 'w') as f: f.write('text'). 'w' overwrites; 'a' appends. *args packs extra positional args as tuple; **kwargs packs keyword args as dict.

Question 49 Python Programming

What are arithmetic operators in Python?

Parameters are variables in function definition; arguments are values passed when calling. Keyword arguments use name=value. They include + (addition), - (subtraction), * (multiplication), / (division), // (floor division), % (modulo), and ** (exponentiation). for item in iterable: iterates over sequences like lists or range(). range(n) generates 0 to n-1. Define as def func(param=default):. Caller can omit if using default.

Question 50 Python Programming

How do you raise an exception?

raise ValueError('message'). Used for custom error conditions. print() outputs objects to stdout. It converts them to strings, with sep=' ' between arguments and end='\n' at the end. break exits loop; continue skips to next iteration; pass is a no-op placeholder. Subclass: class Child(Parent):. Child inherits methods; override with same name.