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1. What does this print, using decode from this lesson? ``

python
print(decode("2[x3[y]]"))

``

xyyyxyyxyyyxyyyxyyxyyyxxyyyxyyy

2. When the decoder reads [, what does it save?

Only the count that came before the bracketThe closing bracket, so it can be matched laterThe count and the text built so farA copy of the whole input string

3. What does this print, using simplify from this lesson? ``

python
print(simplify("/x//y/../z/."))

``

/x/y/z/z/x/../z/x/z

4. What does this print, using evaluate from the calculator lesson? ``

python
print(evaluate("20 / 3 * 3"))

``

292018

5. If the .. check in simplify is replaced by this loop, what does simplify return for /a/..bak/b? Assume the empty parts and . are skipped, as in the lesson's simplify. ``

python
if part.startswith(".."):
    if stack:
        stack.pop()
else:
    stack.append(part)

``

/a/..bak/b/a/b/b/..bak/b

Two-stack calculators and string decoding