Some scripts you will write for cybersecurity encryption and decryption will need to access each character in a string. As a warmup for this, let's try a script that checks and displays a certain character in a string.
Example script: char_access_intro
- Enter, name, and save char_access_intro.
- Click the Send to micro:bit button.
# char_access_intro
from microbit import *
sleep(1000)
s = "ABCDEF 12345"
print("Fifth character in s:")
c = s[5]
print("c = s[5] =", c)
print()
- Check the results in the serial monitor.
- Verify that it displays c = s[5] = F.
- Try replacing 5 with other values, like 0, 1, 2, ...and anything up to 11. What happens with each value?
How char_access_intro Works
The string s is "ABCDEF 12345". The string name, followed by a positive index value in square brackets, returns the character at that location in the string. The index starts with A at s[0], B is at s[1], and so on up to the character 5 at s[11]. You can also use -1 through -12 to index characters from rightmost to left.
