python- code reuse (Function)

First, the function

1, the function definition

def function name (parameter list):

<body>

2, returns the return value

The return value can have a plurality of

## a plurality of return value 
DEF sumDiff (X, Y): 
    return X + Y, XY 

N1, N2 = the eval (INPUT ( 'Enter two numbers:')) 
S, D = sumDiff (N1, N2) 
Print ( ' and {} is the difference for the {} '. format (s, d))

Calculating perimeter of the triangle ## 
Import Math 

DEF Square (X): 
    return X * X 
# calculating the distance between two points 
DEF Distance (X1, X2, Y1, Y2): 
    dist = Math.sqrt (Square (X1-X2) Square + (Y1-Y2)) 
    return dist 
# determines whether or not three points triangles 
DEF isTriangle (X1, Y1, X2, Y2, X3, Y3): 
    In Flag = ((X1-X2) * (Y2-Y3) - ( X2-X3) * (Y1-Y2)) = 0! 
    return In Flag 

DEF main (): 
    Print ( 'enter three coordinate point (X, Y):') 
    X1, Y1 = the eval (iNPUT ( '1 coordinate point ( X1, Y1) = ')) 
    X2, Y2 = the eval (INPUT (' coordinate point 2 (X2, Y2) = ')) 
    X3, Y3 = the eval (INPUT (' coordinate point 3 (x3, y3) = ' )) 
    # determines whether or not the three points form a triangle 
    iF (isTriangle (X1, Y1, X2, Y2, X3, Y3)): 
        ## calculated perimeter of the triangle 
        Perim Distance = (X1, Y1, X2, Y2) + Distance (X2, Y2, X3, Y3) + distance (x3, y3, x1, y1) 
        Print ( 'the perimeter of the triangle as: {:. 2f}'. the format (Perim)) 
    the else: 
        Print ( 'not three points form a triangle') 

main ()

3, parameter

If the variable is an object variable [list], returns to the calling program, the state of the object will appear after being modified

def addInterest(balances,rate):
    for i in range(len(balances)):
        balances[i] = balances[i] * (1+rate)
def test():
    amounts = [1000,500,1200,789]
    rate = 0.05
    addInterest(amounts,rate)
    print(amounts)
test()  ##[1050.0, 525.0, 1260.0, 828.45]

python- code reuse (Function)

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