Exploring String Operations

What function is used to find the length of a string?

• size()

• count()

• lengthOf()

• len()

Answer explanation

The function used to find the length of a string in Python is 'len()'. The other options, such as 'size()', 'count()', and 'lengthOf()', are not valid for this purpose.

If fruit = 'Mango', what will len(fruit) return?

• 7

• 6

• 5

• 4

Answer explanation

The string 'Mango' has 5 characters: M, a, n, g, o. Therefore, len(fruit) returns 5, which is the correct answer.

How can you access the first character of a string?

• Call the first() method on the string.

• Access the string using string[1] for the first character.

• Use string.charAt(0) to get the first character.

• Use indexing, e.g., string[0] to access the first character.

Answer explanation

To access the first character of a string, you should use indexing with string[0]. This retrieves the character at the first position. The other options are incorrect as they either use the wrong index or refer to non-existent methods.

What does slicing a string mean?

• Slicing a string means converting it to uppercase.

• Slicing a string is the process of reversing the string.

• Slicing a string is the process of obtaining a substring by specifying a range of indices.

• Slicing a string refers to removing all whitespace from it.

Answer explanation

Slicing a string refers to obtaining a substring by specifying a range of indices, allowing you to extract specific portions of the string. The other options describe different string manipulations, not slicing.

Given pie = 'ApplePie', what does pie[:5] return?

• ApplePie

• Appl

• Apple

• Pie

Answer explanation

The expression pie[:5] returns a substring of 'ApplePie' starting from index 0 up to, but not including, index 5. This gives 'Apple', which is the correct answer.

What will pie[6] return if pie = 'ApplePie'?

• A

• P

• e

• i

Answer explanation

In Python, string indexing starts at 0. Therefore, pie[6] accesses the 7th character of 'ApplePie', which is 'i'. Thus, the correct answer is 'i'.

How do you slice a string from the start to a specific index?

• Use 'string[index:index+length]' to slice a string from a specific index with a given length.

• Use 'string[:index]' to slice a string from the start to a specific index.

• Use 'string[-index:]' to slice a string from the end to a specific index.

• Use 'string[index:]' to slice a string from a specific index to the end.

Answer explanation

The correct way to slice a string from the start to a specific index is by using 'string[:index]'. This syntax extracts all characters from the beginning of the string up to, but not including, the specified index.

What does pie[5:] return for pie = 'ApplePie'?

• Pies

• PieApple

• Pie

• Apple

Answer explanation

The expression pie[5:] returns a substring starting from index 5 to the end of the string 'ApplePie'. The character at index 5 is 'P', so it returns 'Pie', which is the correct answer.

If pie = 'ApplePie', what does pie[2:6] return?

• pleP

• Pie

• Apple

• App

Answer explanation

The expression pie[2:6] slices the string 'ApplePie' from index 2 to 5 (6 is not included). This results in 'pleP', which is the correct answer.

What is the output of pie[-8:] if pie = 'ApplePie'?

• ApplePie

• Applesauce

• Apple

• Pie

Answer explanation

The slice pie[-8:] starts from the 8th character from the end of the string 'ApplePie', which includes all characters from that point to the end. Thus, it returns 'ApplePie', making it the correct answer.