adding and variable assignment in Python

def sumOfStudentDigits():  
    studentdigit = (studentdigit1 + studentdigit2 + studentdigit3 + studentdigit4 + studentdigit5 + studentdigit6 + studentdigit7)

    studentdigit1=3 studentdigit2=6 studentdigit3=9 studentdigit4=3 
           studentdigit5=1 studentdigit6=0 studentdigit7=0

I need to assign seven digits to seven variables and add them together.

If your confusion is how to get the studentdigits into your function, you can pass them into the function like this:

def sumOfStudentDigits(studentdigit1, studentdigit2, studentdigit3,
                       studentdigit4, studentdigit5, studentdigit6,
                       studentdigit7):
    studentdigit = (studentdigit1
                    + studentdigit2
                    + studentdigit3
                    + studentdigit4
                    + studentdigit5
                    + studentdigit6
                    + studentdigit7)

My advice would be to have all those digits stored in a list, and then pass merely that list to the function, then iterate over the list:

listofdigits = [studentdigit1,
                studentdigit2,
                studentdigit3,
                studentdigit4,
                studentdigit5,
                studentdigit6,
                studentdigit7]

def sumOfStudentDigits(studentdigitlist):
    sum = 0
    for digit in studentdigitlist:
        sum += digit
        return sum

print(sumOfStudentDigits(listofdigits))

We have to set sum = 0 before we can use sum because python wants to know what sum is before it uses it, so we assign it 0 so that we can count up from there. Notice how studentdigitlist and listofdigits are different? You can pass a list of any name to the function, all that matters is that you use the variable (ie a list in this case) name that you have used in def myfunction(yourvariable): throughout the function definition. Python with substitute whatever you pass into the function for where you have that placeholder name within the function. Then when you run the function: eg

def myfunction(yourvariable):
    # do stuff with yourvariable
    myvariable = myvariable + 7

somenumber = 2
myfunction(somenumber)
# now somenumber will equal 9