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pythonfunctiondefined
João Silva
João Silva

Reputation: 3

Python error with functions

I'm trying to write a code but there's something wrong. I'm not able to print the result of a function. Here is a mini example of what's wrong in my code:

import math

def area(r):
    "It will display the area of a circle with radius r"
    A = math.pi*r**2
    print("The answer is:", str(A))
    return A

area(3)

print(str(A)) # This line is not working

# NameError: name 'A' is not defined

Upvotes: 0

Views: 327

Answers (2)

Rekoc
Rekoc

Reputation: 438

You can also do :

print "The answer is: " + str(area(3))

Upvotes: 0

Yam Mesicka
Yam Mesicka

Reputation: 6581

When you define a variable within a function, it is defined only within that function and does not leak out to the rest of the program. That is why A is not accessible outside of the area function.

Using return, you are able to send values back to the place where the function was called from.

The last two lines should look like:

total_area = area(3)

print(str(total_area))

Upvotes: 1

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