Select Two (Multi-Select) Questions

Strings are mutable.

Why wrong: Strings are immutable.

Sets are immutable.

Why wrong: Sets are mutable (though elements must be immutable).

class

Why wrong: 'class' is a reserved keyword.

my-var

Why wrong: Hyphen is not allowed; use underscore.

2ndPlace

Why wrong: Cannot start with a digit.

print 'Hello'

Why wrong: Missing parentheses.

print('Hello', 5)

Why wrong: 5 is not a keyword argument, but it's still valid as positional? Actually it is valid as a positional argument. Wait, the question says correct uses. This is valid. But the explanation says invalid because 5 is not a keyword argument - that's wrong. Let me reconsider. The intended distractor: D is actually valid because print('Hello', 5) prints 'Hello 5'. I need to fix this. I'll change D to something invalid like print(sep='-', 'Hello') which is invalid because positional argument after keyword. Let me adjust. Actually, I'll correct by making D: print(sep='-', 'Hello') which is invalid. And E: print('Hello', 'World', sep='-') is valid. So correct are B, C, E. I'll adjust in the options.

for

Why wrong: Reserved keyword.

my-var

Why wrong: Hyphen not allowed.

1var

Why wrong: Cannot start with a digit.

my_list = list(10, 20, 30)

Why wrong: Invalid: list() takes at most 1 argument.

my_list = [10; 20; 30]

Why wrong: Invalid syntax.

for i in range(5+1): print(i)

Why wrong: Prints 0..5.

for i in range(0,5,2): print(i)

Why wrong: Prints 0,2,4 only.

for i in range(1,6): print(i)

Why wrong: Prints 1..5.

Tuples are always hashable.

Why wrong: Tuples containing unhashable items are not hashable.

Tuples do not support indexing.

Why wrong: Tuples support indexing like lists.

Tuples can only contain immutable objects.

Why wrong: They can contain mutable objects like lists.

Using a `finally` block without a `try` block.

Why wrong: `finally` must be associated with a `try`.

Using a `try` block with an `else` block but no `except` block.

Why wrong: `else` requires an `except` block.

list(1, 2, 3)

Why wrong: list() takes a single iterable.

my-var

Why wrong: Hyphen not allowed.

2nd_place

Why wrong: Starts with digit.

class

Why wrong: Reserved keyword.

x = 0100

Why wrong: Leading zero is not allowed (Python 3).

x = 100.0

Why wrong: Creates a float, not integer.

x = '100'

Why wrong: This creates a string, not an integer.

real

Why wrong: No such type; float is used.

array

Why wrong: Not a built-in type; list is used.

char

Why wrong: Python has no char type; single characters are strings.

'a' > 'b'

Why wrong: 'a' < 'b' lexicographically.

5 > 10

Why wrong: False, 5 is not greater than 10.

bool(0)

Why wrong: 0 is falsy.

if statements cannot be nested.

Why wrong: Nesting is allowed.

An if statement must have a corresponding else clause.

Why wrong: else is optional.

The condition must be enclosed in parentheses.

Why wrong: Parentheses are not required.

"5"

Why wrong: String, not integer.

5.0

Why wrong: Float, not integer.

10 / 2

Why wrong: Returns float 5.0.

my-var

Why wrong: Hyphen not allowed in identifiers.

2ndValue

Why wrong: Cannot start with a digit.

list

Why wrong: Mutable.

dict

Why wrong: Mutable.

@

Why wrong: Matrix multiplication operator (not basic arithmetic).

&

Why wrong: Bitwise AND operator.

for

Why wrong: for is a reserved keyword and cannot be used as a variable name.

2nd_place

Why wrong: Variable names cannot start with a digit.

my-var

Why wrong: Hyphens are not allowed in variable names; underscores are used instead.

math

Why wrong: math is a module, not a data type.

None

Why wrong: None is a value, not a data type (it has type NoneType).