pythonswitchcase语句的用法？ |python求取时间序嵌入维数

使用Python模拟实现的方法：

代码示例：

defswitch_if(fun,x,y):

iffun==’add’:

returnx+y

eliffun==’sub’:

returnx-y

eliffun==’mul’:

returnx*y

eliffun==’div’:

returnx/y

else:

returnNone

defswitch_dict(fun,x,y):

return{

‘add’:lambda:x+y,

‘sub’:lambda:x-y,

‘mul’:lambda:x*y,

‘div’:lambda:x/y,

}.get(fun,None)()

print(“switch_if(‘add’,1,2):”,switch_if(‘add’,1,2))

print(“switch_if(‘sub’,1,2):”,switch_if(‘sub’,1,2))

print(“switch_if(‘mul’,1,2):”,switch_if(‘mul’,1,2))

print(“switch_if(‘div’,1,2):”,switch_if(‘div’,1,2))

print(“switch_dict(‘add’,1,2):”,switch_dict(‘add’,1,2))

print(“switch_dict(‘sub’,1,2):”,switch_dict(‘sub’,1,2))

print(“switch_dict(‘mul’,1,2):”,switch_dict(‘mul’,1,2))

print(“switch_dict(‘div’,1,2):”,switch_dict(‘div’,1,2))

switch_if(‘add’,1,2):3

switch_if(‘sub’,1,2):-1

switch_if(‘mul’,1,2):2

switch_if(‘div’,1,2):0.5

switch_dict(‘add’,1,2):3

switch_dict(‘sub’,1,2):-1

switch_dict(‘mul’,1,2):2

switch_dict(‘div’,1,2):0.5