Python函数,参数,变量

func1.py

def sayHello():
    print (‘hello world‘)
sayHello()

func_parm.py

def printMax(a,b):
    if a>b:
        print (a,‘is maximum‘)
    else:
        print (b,‘is maximum‘)
printMax(3,4)
x=5
y=7
printMax(x,y)

func_local.py

def func(x):
    print (‘x is‘,x)
    x=2
    print (‘changed local x to‘,x)
x=50
func(x)
print (‘x is still‘,x)

func_global.py

def func():
    global x
    print (‘x is‘,x)
    x=2
    print (‘changed local x to‘,x)
x=50
func()
print (‘Value of x is ‘,x)

func_default.py

def say(message,times=1):
    print (message*times)

say(‘Hello‘)
say(‘Wolrd‘,5)

func_key.py

def func(a,b=5,c=10):
    print (‘a is ‘,a, ‘and b is‘, b, ‘and c is‘, c)
func(3,7)
func(25,c=24)
func(c=50,a=100)

func_return.py

def maximum(x,y):
    if x>y:
        return x
    else:
        return y
print(maximum(2,3))

func_doc.py

def printMax(x, y):
    ‘‘‘Prints the maximum of two numbers. The two values must be integers.‘‘‘
    x = int(x) # convert to integers, if possible
    y = int(y)
    if x > y:
        print (x, ‘is maximum‘)
    else:
        print (y, ‘is maximum‘)
printMax(3, 5)
print (printMax.__doc__)