def foo():print('from foo')foo()

def Foo(x):print(x)Foo()

def func():passdef upload():passdef download():passdef login():passdef register():passdef ls():pass

1 pass语句什么也不做,一般作为占位符或者创建占位程序,pass语句不回执行任何操作2 保证格式完整3 保证语义完整

def foo()print('andy')
foo()

def foo(x,y):return x+yresult=foo(1,2)
print(result)

def f1(x):return x*2def f2(x)return x+10result=f2(f1(2))
print(result)

 def f1():print('first')return 1print('second')return 2print('third')return 3res=f1()print(res)#1

def foo():count=1while True:print(count)if count == 3:returncount+=1foo()

def bar():passdef foo():return [1,2],1,1.3,{'x':1},barres=foo()
print(res)#([1, 2], 1, 1.3, {'x': 1}, <function bar at 0x000001F597E51E18>)

def foo(x,y): #x=1 y=2x=1y=2print(x,y)foo(1,2)

def foo(x,y):print(x,y)
foo(1,2)#1，2
foo(1,2,3)#多，报错
foo(1,)#少，报错

def foo(x,y):print(x,y)foo(2,1)

def foo(name,age):print(name,age)foo('egon',18)#name='egon' age=18
foo(18,'egon')#name='18 age='egon'
foo(age=18,name='egon')#name='egon' age=18

foo('egon',age=18)#name='egon' age=18
foo(name='egon',18)#报错
foo('egon',age=18,name='lxx')#报错

def foo(x,y=2):print(x,y)foo(1)#x=1,y=2
foo(1,3)#x=1,y=3
foo(y=3,x=1)#x=1,y=3

m=10
def foo(x,y=m):#y=m=10print(x,y)m=20
foo(1)　#x=1,y=10

def register(name,hobby,l=[]):l.append(hobby)print('%s 的爱好为 %s' %(name,l))register('alex','piao')
register('lxx','喝腰子汤')
register('yxx','不洗澡')
register('egon','read')#alex 的爱好为 ['piao']
#lxx 的爱好为 ['piao', '喝腰子汤']
#yxx 的爱好为 ['piao', '喝腰子汤', '不洗澡']
#egon 的爱好为 ['piao', '喝腰子汤', '不洗澡', 'read']def register(name, hobby, l=None):if l is None:l=[]l.append(hobby)print('%s 的爱好为 %s' % (name, l))register('alex', 'piao')
register('lxx', '喝腰子汤')
register('yxx', '不洗澡')
register('egon', 'read')#alex 的爱好为 ['piao']
#lxx 的爱好为 ['喝腰子汤']
#yxx 的爱好为 ['不洗澡']
#egon 的爱好为 ['read']

def register(name,age,sex='男'):print(name,age,sex)register('李铁蛋',18,)
register('李银蛋',28)
register('张铜蛋',38)
register('刘卤蛋',48)
register('刘二丫',19,'女')#李铁蛋 18 男
#李银蛋 28 男
#张铜蛋 38 男
#刘卤蛋 48 男
#刘二丫 19 女

def foo(x,y,*z): #z=(3,4,5,6)print(x,y,z)foo(1,2,3,4,5,6)

def foo(x,y,z):print(x,y,z)
foo(1,*(2,3,4,5,6)) #foo(1,2,3,4,5,6)报错，需要3个，给了6个
foo(*(1,2,3)) #foo(1,2,3)
foo(*'hello')#  foo(‘h’，'w','l','l','o')报错，需要3个，给了6个
foo(*'abc') #foo('a','b','c')#解决方案
def foo(x,y,*z): #z=(3,4,5,6)print(x,y,z)
foo(1,*[2,3,4,5,6]) #foo(1,2,3,4,5,6)

def foo(x,y,**z): #z={'z':3,'a':1,'b':2}print(x,y,z)foo(1,y=2,a=1,b=2,c=3)

def foo(x,y,**z):# z={'a':100,'b':200}print(x,y,z)#1 111 {'a': 100, 'b': 200}
foo(1,**{'a':100,'b':200,'y':111})# foo(1,b=200,a=100,y=111)def foo(x,y,z):print(x,y,z)#222 111 333
foo(**{'y':111,'x':222,'z':333})# foo(z=333,x=222,y=111)

def foo(*args,**kwargs): #args=(1,2,3,4,5) kwargs={'a':1,'b':2,'c':3}print(args)print(kwargs)
foo(1,2,3,4,5,a=1,b=2,c=3)def bar(x,y,z):print(x,y,z)def wrapper(*args,**kwargs): #args=(1,2,3,4,5,6) kwargs={'a':1,'b':2,'c':3}bar(*args,**kwargs)bar(*(1,2,3,4,5,6),**{'a':1,'b':2,'c':3}) #bar(1,2,3,4,5,6,a=1,b=2,c=3)
wrapper(1,2,3,4,5,6,a=1,b=2,c=3)

def bar(x,y,z):print(x,y,z)def wrapper(*args,**kwargs): #args=(1,2) kwargs={'z':3}bar(*args,**kwargs)bar(*(1,2),**{'z':3}) #bar(1,2,z=3)
wrapper(1,2,z=3) #虽然调用的是wrapper,但是要遵循的确是bar的参数标准

def foo(x,y,*args,m,n,**kwargs): #args=(3,4,5,6,7,8)print(x,y)#  1,2print(args)# (3,4,5,6,7,8)print(m,n) #222,333print(kwargs)foo(1,2,3,4,5,6,7,8,n=333,m=222,a=1,b=2)