Write a python program that asks a user to enter the value for three resistors R$1,$ R$2$ and R$3.$ Include one or more functions that:

Validates the data by ensuring a positive numeric value was entered. If the entered number is negative or zero, a message should display that this is not a valid resistance. Please enter a positive number.

Calculates the total resistance when R$1$ & R$2$ & R$3$ are in series configuration. Then display a message: $$if R$1,$ R$2$ and R$3$ are in series, then the total resistance is$\_\_\_\_\_\_.$ Refer to the figure below. You can use the following equation. R$\_$total$=$R$1+$R$2+$R$3$

Calculate the total resistance when R$1$ & R$2$ & R$3$ are in a parallel configuration. And display a message that $$if R$1,$ R$2$ and R$3$ are in parallel, then the total resistance is$\_\_\_\_\_\_.$ Refer to the diagram below. You can use the equation. R$\_$total$=($R$1^(-1)+$R$2^(-1)+$R$3^(-1))^(-1)$

Calculate the total resistance when R$1$ & R$2$ are in parallel, and the result is in series with R$3.$ And display a message that $$if R$1,$ R$2$ are in parallel and the result to be in series with R$3,$ then total resistance is$\_\_\_\_\_\_.$ Refer to the figure below. You can use the equation:

R$\_$total$=($R$1^(-1)+$R$2^(-1))^(-1)+$R$3$

Calculate the total resistance when R$1$ & R$2$ are in series and the result is in parallel with R$3.$ And display a message that $$if R$1,$ R$2$ are in series and the result to be in parallel with R$3,$ then total resistance is$\_\_\_\_\_\_.$ Hint: You can use the following equation.

R$\_$total$=(($R$1+$R$2)^(-1)+$R$3^(-1))^(-1)$