python lists, tuples, dictionaries (Mushishi "selenium3 automated testing combat - based on the Python language Note 3")

1. List []

• Definition list

  lists = [1, 2, 'a', 5, 'kite']

• Print List

  Print (Lists [0]) 
  output: [ . 1, 2, ' A ' ,. 5, ' Kite ' ]

• Print a list of elements

  # Print list of the first element [0] 
  Print (Lists [0])
   # print list of three elements [2] 
  Print (Lists [2 ])
   # print the last element in the list [-1] 
  Print ( lists [-1])

• Modify the elements in this list

  # Modify elements in the list is a B 
  Lists [2] = ' B ' 
  Print (Lists)

• Adding new elements

  # Add to the end of the list elements 
  lists.append ( ' C ' )
   Print (Lists)

• Delete the specified element

  # Delete the first element in the list 
  lists.pop (0)
   Print (Lists)

2. tuple ()

• The definition of a tuple

  tup1 = ('a', 'b', 1, 2, 3)

• View tuple

  # Print an element 
  Print (TUP1 [0])
   # printing specified element 
  Print (TUP1 [0: 2 ])
   # printing the second and subsequent start element 
  Print (TUP1 [. 1 :])
   # printing of four before the start of the element 
  Print (TUP1 [:. 3])

• Connection tuple

  tup2 = ('kite', 5, 'c')
  tup3 = tup1 + tup2
  print(tup3)

• Copy tuple

  tup4 = ("Hi!\n")
  print(tup4 * 3)

  Tuples difference list: the list is variable, may be added, modified, deleted elements thereof; the tuples are immutable and can not append, modify and delete elements therein. When the number of elements of uncertainty, it is recommended to use the list.

 

3. Dictionary {}

A plurality of sets of dictionary key pairs, each key of the key: value Composition

• Dictionary definitions

  # Dictionary definitions, key not be the same, value may be the same 
  dicts = { " username " : " Kite " , " password " : 123456}

• Print Dictionary

  # Print all key dictionary, keys () returns a list of dictionary key 
  Print (dicts.keys ())
   # print the dictionary of all value, values () Returns the value of the dictionary list 
  Print (dicts.values ())
   # items ( ) printed dictionary of all elements return in list form 
  Print (dicts.items ())
   # loop print dictionary key and value 
  for k, v in dicts.items ():
       Print ( " dicts Keys IS% r " % k)
       Print ( " % R & lt IS values dicts " % V)

• Add key / value pairs

  dicts["age"] = 22

• Deletes the specified key / value pairs

  dicts.pop("password")