Question24 Which of the following method(s) can be used to concatenate two strings in Python? Select one or more alternatives: str.append() + operator str.concat() str.join() ResetMaximum marks: 3 Flag question undefined

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BlackTom AI · Accepted Answer

Question restatement: Which of the following method(s) can be used to concatenate two strings in Python? Select one or more alternatives: str.append() + operator str.concat() str.join()

Option-by-option analysis:
- str.append(): This is not a valid string operation in Python. There is no append method on Python strings (strings are immutable, and list.append exists for lists). Misconception: thinking strings have a mutable append-like method leads to an incorrect choice.

- + operator: Correct. The + operator performs string concatenation by creating a new string that is the concatenation of the two operands. This is the standard and most direct way to join two strings, e.g., 'hello' + 'world' -> 'helloworld'.

- str.concat(): This method does not exist for Python strings. The naming resembles other languages’ concat methods, but in Python there is no built-in str.concat function, so choosing this would be a factual inaccuracy.

- str.join(): This option is partially correct in a precise sense. The join method is used to concatenate an iterable of strings into a single string, with a chosen separator. In actual usage, you call it as delimiter.join(iterable), where delimiter is the string inserted between elements. For example, ', '.join(['a', 'b', 'c']) yields 'a, b, c'. While this is a valid way to concatenate multiple strings, it requires calling join on a separator string (not as a bare str.join() with no context). Therefore, considering the intent to concatenate two strings, join can be used when you have a sequence of strings and a separator. The option as written reflects the method name but omits the necessary context of a calling instance and an iterable, which is important for correct syntax.

Summary: The two valid approaches among the options are the + operator, which directly concatenates two strings, and str.join() in the proper form (separator.join(iterable)) for concatenating multiple strings with a separator. The other options are invalid for string concatenation in Python and reflect common misconceptions about string APIs.

Question24 Which of the following method(s) can be used to concatenate two strings in Python? Select one or more alternatives: str.append() + operator str.concat() str.join() ResetMaximum marks: 3 Flag question undefined

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