Worksheet

F3.1 String handling

Strings, lists and records · GCSE · OCR J277 2.2.3, AQA 8525 3.2.8, Edexcel 1CP2 6.3.3 · about 15 min

What this lesson is about

Length, indexing, slicing, searching and joining strings, and f-strings.

• Joining strings
• Length and indexing
• Slicing
• Searching
• Building reports with f-strings

Questions 11 marks in all

1. [1 mark]What does this program print?

   first = "Bug"
   second = "Bot"
   print("Hello, " + first + second + ".")

2. [1 mark]What happens with print("battery: " + 92)?

   1. ATypeError: text and a number cannot be joined with +
   2. BIt prints battery: 92
   3. CIt prints battery: + 92
   4. DSyntaxError

3. [1 mark]What does this program print?

   speed = 45
   print(f"driving at {speed} and half is {speed / 2}")

4. [1 mark]What does this program print?

   word = "BugBot"
   print(len(word))
   print(word.upper())

5. [1 mark]What does this program print?

   print("-" * 5)

6. [1 mark]What does this program print?

   print(f"{10 / 3:.2f}")

7. [1 mark]What does this program print?

   word = "BugBot"
   print(word[0], word[3], word[-1])

8. [1 mark]What does this program print?

   word = "BugBot"
   print(word[1:4])

9. [1 mark]What does this program print?

   message = "wall ahead"
   print(message.find("ahead"), message.find("ball"))

10. [1 mark]OCR's name.substring(3, 3) on "BugBot" gives "Bot". What does the second 3 mean?

    1. ATake 3 characters
    2. BStop at index 3
    3. CStart at index 3
    4. DRepeat 3 times

11. [1 mark]What is joining two strings together called?

    1. AConcatenation
    2. BSlicing
    3. CCasting
    4. DIteration

The task: status report

Drive 10 cm, then print one line in exactly this shape (your numbers will differ):

# the two lines every program starts with: the commands, then the robot
from bugbot import *
connect()

forward(50, distance=10)
x, y = position()
print(f"BugBot at x={x} ...")

Plan your program here, then type it in and press Run.

Do it on the robot
www.bugbotlab.com/learn/f3-1-string-handling/
The simulator checks it and tells you when it passes. Nothing to install, no account.

Challenges

1. Print a name backwards. (Hint: a slice can have a third number, the step, and -1 walks backwards.)
2. Ask for a sentence and print how many times the letter e appears in it, using count.
3. Print a report with the heading rounded to a whole number, framed by lines of =.