CHAINMAP PROGRAMMĀ PYTHON

Python satur konteineru ar nosaukumu " Ķēdes karte ' kas iekapsulē daudzus vārdnīcas vienā vienībā. ChainMap ir moduļa 'loceklis kolekcijas '. Piemērs: Python3

    # Python program to demonstrate    # ChainMap    from   collections   import   ChainMap   d1   =   {  'a'  :   1     'b'  :   2  }   d2   =   {  'c'  :   3     'd'  :   4  }   d3   =   {  'e'  :   5     'f'  :   6  }   # Defining the chainmap    c   =   ChainMap  (  d1     d2     d3  )   print  (  c  )

Izvade:

ChainMap({'a': 1 'b': 2} {'c': 3 'd': 4} {'e': 5 'f': 6})

Apskatīsim dažādas operācijas ChainMap

Piekļuves operācijas

atslēgas

vērtības

atslēgas ar atbilstošām vērtībām

Python3

    # Please select Python 3 for running this code in IDE   # Python code to demonstrate ChainMap and   # keys() values() and maps   # importing collections for ChainMap operations   import   collections   # initializing dictionaries   dic1   =   {   'a'   :   1     'b'   :   2   }   dic2   =   {   'b'   :   3     'c'   :   4   }   # initializing ChainMap   chain   =   collections  .  ChainMap  (  dic1     dic2  )   # printing chainMap using maps   print   (  'All the ChainMap contents are : '  )   print   (  chain  .  maps  )   # printing keys using keys()   print   (  'All keys of ChainMap are : '  )   print   (  list  (  chain  .  keys  ()))   # printing keys using keys()   print   (  'All values of ChainMap are : '  )   print   (  list  (  chain  .  values  ()))

Izvade:

All the ChainMap contents are : [{'b': 2 'a': 1} {'c': 4 'b': 3}] All keys of ChainMap are : ['a' 'c' 'b'] All values of ChainMap are : [1 4 2]

Piezīme: Ņemiet vērā, ka atslēga ar nosaukumu “b” pastāv abās vārdnīcās, taču tikai pirmā vārdnīcas atslēga tiek uzskatīta par “b” atslēgas vērtību. Pasūtīšana tiek veikta, kad vārdnīcas tiek nodotas funkcijā.

Manipulācijas operācijas

Python3

    # Please select Python 3 for running this code in IDE   # Python code to demonstrate ChainMap and   # reversed() and new_child()   # importing collections for ChainMap operations   import   collections   # initializing dictionaries   dic1   =   {   'a'   :   1     'b'   :   2   }   dic2   =   {   'b'   :   3     'c'   :   4   }   dic3   =   {   'f'   :   5   }   # initializing ChainMap   chain   =   collections  .  ChainMap  (  dic1     dic2  )   # printing chainMap using map   print   (  'All the ChainMap contents are : '  )   print   (  chain  .  maps  )   # using new_child() to add new dictionary   chain1   =   chain  .  new_child  (  dic3  )   # printing chainMap using map   print   (  'Displaying new ChainMap : '  )   print   (  chain1  .  maps  )   # displaying value associated with b before reversing   print   (  'Value associated with b before reversing is : '    end  =  ''  )   print   (  chain1  [  'b'  ])   # reversing the ChainMap   chain1  .  maps   =   reversed  (  chain1  .  maps  )   # displaying value associated with b after reversing   print   (  'Value associated with b after reversing is : '    end  =  ''  )   print   (  chain1  [  'b'  ])

Izvade:

All the ChainMap contents are : [{'b': 2 'a': 1} {'b': 3 'c': 4}] Displaying new ChainMap : [{'f': 5} {'b': 2 'a': 1} {'b': 3 'c': 4}] Value associated with b before reversing is : 2 Value associated with b after reversing is : 3