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Which of the following statements is FALSE about slicing strings using indices and steps in Python?
a.We can use the [start:stop] syntax to get a substring from a string starting from the start index and ending at the stop index (inclusive).
b.We can use negative indices to slice a string from the end instead of the beginning.
c.We can use the [start:stop:step] syntax to get a substring from a string with a specified step size.
d.We can use the [:] syntax to get a copy of the entire string.
Answer:
Answer by student
a.We can use the [start:stop] syntax to get a substring from a string starting from the start index and ending at the stop index (inclusive).
Detailed answer by teachoo
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Let’s look at the options and see why they are correct or incorrect:
- Option a is false because we cannot use the [start:stop] syntax to get a substring from a string starting from the start index and ending at the stop index (inclusive). In Python, slicing follows the principle of half-open intervals, which means that the start index is included but the stop index is excluded. For example, "Hello"[1:4] returns "ell" , not "ello" . The character at index 4, which is “o”, is not part of the substring.
- Option b is true because we can use negative indices to slice a string from the end instead of the beginning. Negative indices start from -1 and go backwards. For example, "Hello"[-1] returns "o" and "Hello"[-2] returns "l" .
- Option c is true because we can use the [start:stop:step] syntax to get a substring from a string with a specified step size. The step size determines how many characters we skip between each index. For example, "Hello"[0:5:2] returns "Hlo" , which is every second character from index 0 to index 4.
- Option d is true because we can use the [:] syntax to get a copy of the entire string. This is equivalent to slicing from the beginning to the end of the string with no step size. For example, "Hello"[:] returns "Hello" .
So, the correct answer is option a .
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