如何将变量从一个 function 导入 Python 中的另一个变量？

Question

I'm working on a project and I need to import a variable that I got in a function and use it in another one. Here's an example of what I'm trying to do.(this is not my code, just an example)

     def interest(day,month,year):
        interest = x          #I got X by requesting a web data base.

     def calc(debt,time):
        result = (debt*x)/time

Is there a way to import X from one function to another?

Thanks!

Answer 1

Have you considered using a class? Classes are extremely useful if you have variables that must be passed around to many functions.

class Foo:
    def __init__(self):
        pass

    def set_x(self):
        self.x = 5 # Whatever your source is!

    def calculate_something(self, foo, bar):
        return foo * bar * self.x

q = Foo()
q.set_x()
print(q.calculate_something(2, 3))

Output: 30

In case you aren't interested in using classes you could do the following:

1. Fetch x.
2. Pass it to both interest and calc rather than fetching it within interest

Answer 2

You don't import variables from a function to another. Functions are for returning values and variables, and you can always call a function to get its return value. For example:

def interest(amt):
    return amt * FIXED_INT

def calc(debt, time):
    return debt * interest(debt) ** time

Answer 3

You can pass your variable into arguments

 def interest(day,month,year):
    interest = x
    return interest


 def calc(debt,time, interest):
    result = (debt*interest)/time

 ...     

 x = interest(day,month,year)
 calc(debt,time, x)

Answer 4

Here's how I did it:

def grades_sum(scores):
    sum1 = 0
    for i in scores:
        sum1 = sum1 + i
    print sum1
    return sum1

grades_sum([100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5])

def grades_average(grades):

    average = grades_sum(grades)/float(len(grades))

    print average

    return average

grades_average([100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5])

Basically, I returned sum1 in the first function, so that when I call it in the second function, sum1 will be divided by float(len(grades)). Hope I helped! PS Apologies for the ugly formatted text, this is my first post.