Tutorial 14/15 ADVANCED TECHNIQUES

Python: Strings

Strings are lists of characters. You can slice them!

The Hook

Think of a String like a bead necklace.

Each letter is a bead. You can pick one bead (Index) or cut a section of the necklace (Slice).

Remember: Computers start counting from Zero. Index 0 is the first letter!

Extracting parts of a Secret Code.

# Index counts: 0, 1, 2, 3, 4, 5

code = "PYTHON"

print(code[0]) # Gets "P"

print(code[0:3]) # Gets "PYT" (Stops BEFORE 3)

Python doesn't have LEFT() or RIGHT() like other languages. We use slices!

# LEFT(3) -> First 3

text[:3]

# RIGHT(3) -> Last 3

text[-3:]

Logic Gate

What is the value of word[1]?

word = "GALAXY"
print(word[1])

Zero Indexed!

Level 37: Bronze

"Change the index to print the last letter of the string using [-1]."

word = "Python"
print(word[0])

> bronze_stream_standby

Level 38: Silver

"Extract exactly 'Code'. Remember the stop number is NOT included!"

text = "Codebreaker"
# Needs to print "Code"
print(text[0:3])

> debugger_module_monitoring

Level 39: Gold

Independent Search Pattern

> computation_vector_online