Question11 Which syntax is a valid list comprehension? Select one alternative: (a) [x in range(5)] (b) [x for x in range(5)] (c) {for x in range(5) x} (d) (x in range(5)) (e) (x for x in range(5)) ResetMaximum marks: 3 Flag question undefined单项选择题
A
(a) [x in range(5)]
B
(b) [x for x in range(5)]
C
(c) {for x in range(5) x}
D
(d) (x in range(5))
E
(e) (x for x in range(5))

Question

Question11 Which syntax is a valid list comprehension? Select one alternative: (a) [x in range(5)] (b) [x for x in range(5)] (c) {for x in range(5) x} (d) (x in range(5)) (e) (x for x in range(5)) ResetMaximum marks: 3 Flag question undefined单项选择题

A

(a) [x in range(5)]

B

(b) [x for x in range(5)]

C

(c) {for x in range(5) x}

D

(d) (x in range(5))

E

(e) (x for x in range(5))

BlackTom AI · Accepted Answer

To determine which option represents a valid Python list comprehension, we must look at the syntax rules for list comprehensions in Python.
Option (a) '[x in range(5)]' resembles a condition or membership test, not a comprehension. It would create a list with a single element that is the boolean result of the test 'x in range(5)' if it were used with an x defined, but as written it is not valid Python syntax for a comprehension.
Option (b) '[x for x in range(5)]' is the standard form of a list comprehension: it iterates over the iterable 'range(5)' and collects each produced value 'x' into a new list. This matches the correct structural pattern: [ expression for variable in iterable ]. This is the valid option here.
Option (c) '{for x in range(5) x}' uses curly braces, which denote a set or dictionary, not a list. Additionally, the syntax inside is not valid for creating a set or dict from a for-loop; the arrangement is incorrect for Python’s comprehension syntax.
Option (d) '(x in range(5))' appears as a parenthesized boolean expression that would test membership of 'x' in 'range(5)' if 'x' existed, but it does not form any comprehension and is not valid for producing a list.
Option (e) '(x for x in range(5))' looks like a generator expression due to the parentheses, which yields a generator object rather than a list. While this is valid Python syntax for a generator, it does not create a list directly, so it is not a list comprehension.
In summary, only option (b) adheres to the exact syntax of a list comprehension intended to build a list by applying an expression to each item in an iterable, without using parentheses that change the type to a generator or curly braces that imply a set/dict.

Question11 Which syntax is a valid list comprehension? Select one alternative: (a) [x in range(5)] (b) [x for x in range(5)] (c) {for x in range(5) x} (d) (x in range(5)) (e) (x for x in range(5)) ResetMaximum marks: 3 Flag question undefined单项选择题

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