Deck 5: For Loops

What does this loop print?
samples = ['sample_A', 'sample_B', 'sample_C']

for s in samples:

print('Processing:', s)

"Processing: sample_A", "Processing: sample_B", "Processing: sample_C" → one line per item

In a for s in samples: loop, what is s?

A temporary variable that takes on each value in samples, one at a time, reassigned each pass → not a fixed name for one item.

What values does i take in for i in range(5):?

0, 1, 2, 3, 4 → five values, starting at 0.

Why does range(5) produce 0 through 4, not 1 through 5?

Same "up to but not including" logic as slicing → range(5) produces exactly as many indices as there are valid positions in a 5-item list.

What's the typical pattern for processing a list of files in a loop?

Loop over the list of filenames, load each one, compute something, and print or store the result → a template for most batch data-processing tasks.