Python函数,参数,变量

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

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)

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

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)

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

say('Hello')
say('Wolrd',5)

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)

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

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__)