Which of the following statements can be used to return the length of the given string str?

Question

Options

• Astr.size()
• Bstr.len_()
• Csize(str)
• Dlen(str)

• A
  5% (1)
• B
  11% (2)
• D
  84% (16)

Explanation

len(str) is the correct Python built-in function for returning the length of a string - it works on any sequence type (strings, lists, tuples) by passing the object as an argument.

str.size() (A) is invalid in Python; .size() is a method on NumPy arrays, not strings. str.len_() (B) does not exist at all in Python - this is a fabricated method that will raise an AttributeError. size(str) (C) is also not a built-in Python function; size only exists as numpy.size(), which doesn't apply to plain strings.

Memory tip: In Python, len() is a function you call on the object, not a method the object calls on itself - think "len is the language's tool, not the string's." If you're coming from Java or C++, resist the urge to write str.length().

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