Python implements function calling methods with similar structures.

Python implements function calling methods with similar structures.

Python dict is easy to use. You can customize the key value and access it through subscript, for example:
Copy codeThe Code is as follows:
>>> D = {'key1': 'value1 ',
... 'Key2': 'value2 ',
... 'Key3': 'value3 '}
>>> Print d ['key2']
Value2
>>>

Lambda expressions are also very useful, for example:
Copy codeThe Code is as follows:
>>> F = lambda x: x ** 2
>>> Print f (2)
4
>>>

The combination of the two can implement function calls with similar structures, which is convenient to use. The example is as follows:

Example 1: Without Parameters
Copy codeThe Code is as follows:
#! /Usr/bin/python
 
MsgCtrl = "1: pause \ n2: stop \ n3: restart \ nother to quit \ n"
 
CtrlMap = {
'1': lambda: doPause (),
'2': lambda: doStop (),
'3': lambda: doRestart ()}
 
Def doPause ():
Print 'do pause'
 
Def doStop ():
Print 'do stopped'
 
Def doRestart ():
Print 'do restart'
 
If _ name _ = '_ main __':
While True:
Print msgCtrl
Export CTRL = raw_input ('input :')
If not ctrlMap. has_key (partition CTRL): break
CtrlMap [Export CTRL] ()

Example 2: With Parameters

Copy codeThe Code is as follows:
#! /Usr/bin/python
 
MsgCtrl = "1: + \ n2:-\ n3: * \ nother to quit \ n"
 
CtrlMap = {
'1': lambda x, y: x + y,
'2': lambda x, y: x-y,
'3': lambda x, y: x * y}
 
 
If _ name _ = '_ main __':
While True:
Print msgCtrl
Export CTRL = raw_input ('input :')
If not ctrlMap. has_key (partition CTRL): break
Print ctrlMap [Export CTRL] (), "\ n"