Data Types And String Manipulation

Question 1

What is a data type?

Answer 1

A classification that tells the computer what kind of data is being used and how it should be stored and processed.

Question 2

What are the main data types in Python?

Answer 2

• Integer (int): Whole numbers (e.g., 5, -10)
• Float: Decimal numbers (e.g., 3.14, -0.01)
• String (str): Text enclosed in quotes (e.g., “hello”)
• Boolean (bool): True or False

Question 3

What is a string in Python?

Answer 3

A sequence of characters enclosed in quotation marks (e.g., “Computer”).

Question 4

How can you access characters in a string in Python?

Answer 4

Using indexing: string[index], where indexing starts at 0.

For example, “hello”[1] returns “e”.

Question 5

How do you get the length of a string in Python?

Answer 5

Use the len() function — e.g., len(“hello”) returns 5.

Question 6

How do you slice a string in Python?

Answer 6

Using string[start:end], which returns characters from the start index up to but not including the end index.

Example: “hello”[1:4] returns “ell”.

Question 7

What does string.upper() do in Python?

Answer 7

Converts all letters in the string to uppercase.

Question 8

What does string.lower() do in Python?

Answer 8

Converts all letters in the string to lowercase.

Question 9

What does string.strip() do in Python?

Answer 9

Removes whitespace (or other characters) from the beginning and end of the string.

Question 10

What does string.replace(old, new) do in Python?

Answer 10

Replaces all instances of the old substring with new.

Example: “hello”.replace(“l”, “x”) → “hexxo”.

Question 11

What does string.find(sub) do in Python?

Answer 11

Returns the index of the first occurrence of the substring sub. If not found, it returns -1.

Question 12

How do you concatenate (join) strings in Python?

Answer 12

Use the + operator.

Example: “Hello “ + “World” → “Hello World”.

Question 13

How do you convert a string to an integer in Python?

Answer 13

Use int(string).

For example: int(“5”) → 5.

Question 14

How do you convert an integer to a string in Python?

Answer 14

Use str(integer).

For example: str(10) → “10”.

Question 15

What is string iteration in Python?

Answer 15

Using a loop to go through each character in a string, e.g.:
for letter in “hello”:
print(letter)

Question 16

Why is it important to understand string manipulation in programming?

Answer 16

Because strings are used frequently in input/output, data processing, and communication with.