Localize variables with Block

Example 2 steps, run in order in one session. Every step was executed against the engine and the output below is what it produced.

Step 1

Block[{f = Sin[x + I y]}, ParametricPlot[Evaluate[{Re[f], Im[f]}], {x, -Pi, Pi}, {y, -2, 2}, Mesh -> Automatic]]

Output

-Graphics-

Step 2

? f

Output

Missing[UnknownSymbol, f]

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Functions used

Block Evaluate Im ParametricPlot Re Sin

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