Select Two (Multi-Select) Questions

raise

Why wrong: Valid only inside except block to re-raise.

raise Exception

Why wrong: Missing parentheses; should be Exception().

throw ValueError('error')

Why wrong: 'throw' is not Python; use 'raise'.

str.upper()

Why wrong: Returns a string.

str.find()

Why wrong: Returns integer index or -1.

D does not have a method named 'method'

Why wrong: D inherits method from B.

The super() call in B would call C.method

Why wrong: super() in B would call the next class in MRO, which is C, but only if B calls super(). Here, B does not call super().

str.join()

Why wrong: Returns a new string; does not modify in place.

str.replace()

Why wrong: Returns a new string; does not modify in place.

str.strip()

Why wrong: Returns a new string; does not modify in place.

obj.attr = 5 on an instance

Why wrong: This creates an instance attribute.

class MyClass: def method(self): pass

Why wrong: This defines a method, not an attribute.

class MyClass: def __init__(self): self.attr = 5

Why wrong: This creates an instance attribute.

CustomException

Why wrong: User-defined, not built-in.

InputError

Why wrong: Not a built-in exception.

FileReadError

Why wrong: Not a built-in exception.

str.upper()

Why wrong: Returns a new string, not a boolean.

str.split()

Why wrong: Returns a list of strings.

str.join()

Why wrong: Returns a string.

Set

Why wrong: Sets are mutable.

Dictionary

Why wrong: Dictionaries are mutable.

List

Why wrong: Lists are mutable.

lines = list(f)

Why wrong: Converts iterator to list, loading all lines.

contents = f.read().split('\n')

Why wrong: Reads entire file and splits.

lines = f.readlines()

Why wrong: Reads all lines into memory.

IOError is a separate class from OSError.

Why wrong: IOError is an alias for OSError.

GeneratorExit inherits from Exception.

Why wrong: GeneratorExit inherits from BaseException.

It can only be used with file objects.

Why wrong: It works with any context manager.

It automatically opens the file without needing open().

Why wrong: open() is still required.

It prevents any exception from occurring during file operations.

Why wrong: Exceptions can still occur; they are not suppressed.

import Math

Why wrong: Python module names are case-sensitive; 'Math' is not a standard module.

import math,

Why wrong: Trailing comma is invalid syntax in import statement.

from math import

Why wrong: Incomplete; a name to import must be specified.

__init__

Why wrong: __init__ initializes the object but is not required for iteration or membership.

__contains__

Why wrong: Optional; membership can be implemented via __iter__.

They can access instance attributes via self.

Why wrong: They have no self.

They can access class variables only via cls.

Why wrong: They have no cls.

They can only be defined inside a metaclass.

Why wrong: They are defined in any class.

\x

Why wrong: Incomplete hex escape; must be followed by two hex digits.

\q

Why wrong: Not a recognized escape sequence; would be treated as literal backslash and q.

count()

Why wrong: Incorrect: count() returns the number of non-overlapping occurrences.

find()

Why wrong: Incorrect: find() returns the index of a substring, not a Boolean.

index()

Why wrong: Incorrect: index() returns the index of a substring or raises ValueError.

bytearray

Why wrong: Bytearrays are mutable.

list

Why wrong: Lists are mutable.

s[0] == 'p'

Why wrong: Incorrect: The first character is 'P', not lowercase 'p'.

s.isupper()

Why wrong: Incorrect: Not all characters are uppercase.

'x' in 'abc'

Why wrong: Character 'x' is not in 'abc'.

'ab' not in 'abc'

Why wrong: 'ab' is in 'abc', so not in is false.

'abc' in 'ab'

Why wrong: 'abc' is longer than 'ab', so not a substring.

"Hello $s" % "World"

Why wrong: Invalid: $ is not a valid placeholder.

f"Hello {world}"

Why wrong: Requires the variable 'world' to be defined, which is not guaranteed.

"Hello {name}".format("World")

Why wrong: Raises KeyError because 'name' is not provided as a keyword argument.