I have a function that contains several variables, but I only want to run it for one variable at the time. For example only for "exrate". The idea is to pass "exrate" into the function and then for-loop "exrate" only and calculate the result. Unfortunately the the value "turnover" does not change.
exrate = 100
sales = 0
def sim(var, min, max):
for var in range(min, max):
turnover = 1000 * (exrate/100) + sales
print(turnover)
sim(exrate, 100, 105)
sim(sales, 1000, 1100)
Let's try to refactor your original code a bit:
exrate = 100
sales = 0
def sim(var, min, max):
for var in range(min, max):
turnover = 1000 * (exrate/100) + sales
print(turnover)
First, we can factor out the function used in sim, which would be:
def f(exrate, sales):
return 1000 * (exrate/100) + sales
and that function can be simplified further 1000/100=10:
def f(exrate, sales):
return 10 * exrate + sales
You're using globals exrate=100, sales=0 but that's not a good idea, so lets' get rid of those globals by just using default parameters:
def f(exrate=100, sales=0):
return 10 * exrate + sales
Now, at this point we've got a mathy function we can use as input to another functions, it's a function with one single responsability.
So let's say we want to see how this function evolves with respect to one of its independent variables (exrate or sales):
for i in range(100, 1000, 100):
print(f(exrate=i))
for i in range(0, 1000, 200):
print(f(sales=i))
Or both:
for i in range(0, 1000, 200):
print(f(exrate=200, sales=i))
The main idea would be, when simulating something is a good idea to split the code into code that does the simulation (plotting the function in a graph, print values onto a console, ...) and the code which is the simulation itself (in this case, a simple linear function of the form f(x)=ax+b)
You are using a variable external to the function in the definition. Consider replacing exrate with var within the function definition.
turnoverdefined? the variablevarisexrateinside the function. You may first need to clean up variable names.self.exrateandself.salesin the function you define?varargument it's passed because it creates a local variable of the same name. What would you want the function to do with the variable (or variable name) it's passed?