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Lab #2-4 Follow-Up: Further into Python

Lab #2-4 Follow-Up: Further into Python. Part 1: Functions. The Sin of Repeating Code. No No No :. motors(1, 1) motors(1, 1) motors(-1, -1) motors(-1, -1). The Sin of Repeating Code. No No No :. motors(1, 1) motors(1, 1) motors(-1, -1) motors(-1, -1) motors(-1, 1).

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Lab #2-4 Follow-Up: Further into Python

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  1. Lab #2-4 Follow-Up:Further into Python

  2. Part 1: Functions

  3. The Sin of Repeating Code No NoNo: motors(1, 1) motors(1, 1) motors(-1, -1) motors(-1, -1)

  4. The Sin of Repeating Code No NoNo: motors(1, 1) motors(1, 1) motors(-1, -1) motors(-1, -1) motors(-1, 1)

  5. Thou Shalt Not Repeat Code! Yes: def forward(pwr): motors(pwr, pwr) defbackward(pwr): motors(-pwr, -pwr) forward(1) backward(1)

  6. def forward(pwr): motors(pwr, pwr) defbackward(pwr): forward(-pwr) Functions support code factoring

  7. def forward(pwr): motors(pwr, pwr) defbackward(pwr): forward(-pwr) Functions support code factoring As in Algebra: ax + bx x (a + b)

  8. r = 2.5 A = pi*r*r # Circle Vc = pi*r*r*h # Cylinder Vs = 4/3 pi*r*r*r # Sphere Factor everywhere!

  9. r = 2.5 A = pi*r*r # Circle Vc = pi*r*r*h # Cylinder Vs = 4/3 pi*r*r*r # Sphere Factor everywhere!

  10. r = 2.5 A = pi*r*r # Circle Vc = A*h # Cylinder Vs = 4/3 A*r # Sphere Factor everywhere!

  11. Anatomy of Python Function Parameter(s) defforward(pwr): motors(pwr, pwr) Mandatory indent (use tab key)

  12. Use helpful comments! # Moves the robot forward with # specified motor power def forward(pwr): motors(pwr, pwr)

  13. Functions can return values, too defareaOfCircle(radius): return pi * radius * radius r = 3 a = areaOfCircle(r) Doesn’t have to be same name!

  14. Functions can call other functions defareaOfCircle(radius): return pi * radius * radius def volumeOfCylinder(radius, height): return areaOfCircle(radius) * height

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