# Python tutorial (learning Python) --2.3.5 Python returns a value problem Recommended for you: Get network issues from WhatsUp Gold. Not end users.

Function this section to learn Python is how to return more than one value problem.

Found surprised when learning Python, Python function can return multiple values, very interesting.

```#define function sum
def sum(x, y):
z = x + y
x = x ^ y
y = x ^ y
x = x ^ y
return z, x, y

#define function main
def main():
a = int(raw_input("plz input a "))
b = int(raw_input("plz input b "))
c = sum(a, b)
print(c)

#entry of programme
main()
```

Have a look first to the execution of the program results

```plz input a 12
plz input b 13
(25, 13, 12)
```

Results (25,13,12) this seems strange, this is Python tuple (tuples), a new term, we will never mind behind list will mention. In the function sum, in addition to sum (line third) in addition to exchange X and the y value of the operation (fourth ~ 6), return to the Z, x, y (seventh lines) to the main function of the C (line thirteenth) print results (line fourteenth), indeed X and y exchange the value of.

The main function in the A and B change? A or 12, B or 13? We in the main function in the print (c) (Fourteenth) after two print statements, print a and b values (line 15,16), a and B did not have a look?

```#define function sum
def sum(x, y):
z = x + y
x = x ^ y
y = x ^ y
x = x ^ y
return z, x, y

#define function main
def main():
a = int(raw_input("plz input a "))
b = int(raw_input("plz input b "))
c = sum(a, b)
print(c)
print(a)
print(b)

#entry of programme
main()
```

The operation results

```plz input a 12
plz input b 13
(25, 13, 12)
12
13
```

The conclusion is not affected a and b values. Call the sum function, the A and b values for X and y a (A and X point to 12 local data unit (b) and Y point to 13 local data unit), in the sum function x and Y through the exchange operation, change the data unit to perform X and Y direction.

Zhi Pu education Python www.jeapedu.com

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Posted by Frances at November 21, 2013 - 5:54 AM