(Sep-28-2018, 08:34 PM)ichabod801 Wrote: I'm going to back down to simple things, and rewrite your three function example with parameters:

def Main(CustomerIndex, LoadedSales, InxLoc):
    CustomerSaleID = CustomerSaleOBJID(LoadedSales, InxLoc)
    Vin = FindVin(CustomerIndex, LoadedSales, InxLoc)
    Fnum = FindFnum(CustomerIndex, CustomerSaleID)

def FindVin(CustomerIndex, LoadedSales, InxLoc):
    Vin = str(CustomerIndex[int(float(LoadedSales['CC'][InxLoc]))][2])[-8:]
    return Vin
 
def FindFnum(CustomerIndex, CustomerSaleID):
    Fnum = str(CustomerIndex[CustomerSaleID][3])
    return Fnum
 
def CustomerSaleOBJID(LoadedSales, InxLoc):
    CustomerSaleID = int(float(LoadedSales['CC'][InxLoc]))
    return CustomerSaleID

So each value that a function needs is passed to that function as a parameter when it is called. To do this, you have to specify that the function is expecting that parameter when it is defined. You say this Fnum is needed in 13 different functions. So each one of those would be defined with Fnum as a parameter, and when each one is called, Fnum would get passed to that function as a parameter. All of this is explained in more detail in the functions tutorial linked to in my signature below. Including what Nilamo alluded to, where you can assign default values to parameters, so that the function can be called without that parameter, if it is a common (but not always) used parameter.

(Sep-28-2018, 08:36 PM)volcano63 Wrote: Use OOP, with properly designed classes.

And write according to PEP-8 - because otherwise quite a few Pythonista (myself included) will refuse looking at your code