Variables can be reassigned, given a new value that replaces the old one. The container keeps its name; its contents change. The computer only remembers the most recent assignment.
EXAMPLE
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YOUR TURN
Your turn → The JavaScript tab hides a saboteur line. Delete it, run both tabs, and confirm both print 25.
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Syntax has to be exact. Every quote, bracket and parenthesis needs its partner, and in Python the spaces at the start of a line count. One slip and the program won't run; the message will say where.
One subtlety that trips everyone up once: copying a variable copies its current value, not a live link.
EXAMPLE
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YOUR TURN
Your turn → Make a variable called first that holds your first name, copy it into a variable called original, then change first to a nickname. Print both to see that original kept the first value.
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Syntax has to be exact. Every quote, bracket and parenthesis needs its partner, and in Python the spaces at the start of a line count. One slip and the program won't run; the message will say where.
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