Unit 2.6:Strings

Question 1

What is a string?

Answer 1

An ordered sequence of characters, which can be letters, numbers, or symbols.

Question 2

What is string indexing?

Answer 2

Accessing parts of a string using an index that begins at 0. For example, if aStr = “Python”, aStr[0] will return “P”.

Question 3

What is string slicing (e.g., aStr[0:4])?

Answer 3

This will return a portion of the string, including the character at the first index and not including the character at the last index. For aStr = “Python”, aStr[0:4] returns “Pyth”.

Question 4

What is a len() subprogram?

Answer 4

A built-in subprogram that returns an integer representing the length of the string (the number of characters it contains).

Question 5

What does Immutability of Strings mean?

Answer 5

The concept that once a string has been assigned to a variable, its value cannot be changed. However, the variable can be reassigned a new value.

Question 6

What is String Concatenation?

Answer 6

The process of joining strings together using the + operator.

Question 7

What is .upper() and .lower() methods?

Answer 7

Operators that return a modified string with all letters converted to upper or lower case, respectively, without changing the original string.

Question 8

What is String Slicing with a Step?

Answer 8

An optional third parameter in string slicing that determines the step size when extracting characters. By default, it is set to 1.

Question 9

What is .split() method?

Answer 9

A method used when a string is made of several words to break it down into a list of separate words.

Question 10

What is a List Data Type?

Answer 10

An ordered, mutable sequence of elements.

Question 11

What is typecasting?

Answer 11

A method used to change the data type of a variable to match the operation you want to perform. In Python, you can use built-in functions like int() , str() , float() ,