# Python tutorial (learning Python) --2.3.5 Python returns a value problem

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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.

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