Learn about Python's list and tuple today

   1:  "'
   2:   arrays have list and tuple points
   3:  "'
   4:  
   5:  classmates=[' A ', ' B ', ' C ', ' d ']
   6:  print (classmates)
   7:  Length=len (classmates)
   8:  print (length) #4
   9:  print (classmates[0]+classmates[1]) # AB
  :  #print (classmates[5]) #IndexError: List index out of range
One   :  print (classmates[-1]) #! The index of the last element is-1
  :  classmates.append (#在最后加个元素88)
  :  print (classmates)
  :  classmates.insert (2,45)
  :  "'
  :      Add a 45 to the second position
  :  "
  :  print (classmates)
  :  Classmates.pop (-2)
  :  "'
Seven   :   Delete the second-to-last    element
A   :  "'
At   :  print (classmates)
  :  a=[[1,2,3],[4,5,6],[7,8,9]]
  :  print (a)
  £ º  
  :  
  :  "
  :  Tuple cannot change, once definition cannot be changed. Once a tuple is defined, the element must be fixed.
  :  "'
  :  classmates= (' A ', ' B ', ' C ')
  :  p=[' asp ', ' php '
  :  s=[' python ', ' Java ', p, ' scheme '
  :  print (s[2][1])
  :  a= ()
A   :  print (a)
  Panax notoginseng  :#定义只有一个元素的tuple的时候必须在定义后面加一个 ","
  :  a= (1,)
Section   :  print (a)
Max   :  "'
All   :   output is (1,)
"   :  "
  :  
  :  a= (1)
  :  Print (a) #输出为1
#但是这样可以变:   
A   :  l= (' A ', ' B ', [up])
  :  print (L)
  :  l[2].append (54)
  :  print (L)
  Wuyi:  #但这样变的只是L中的tuple.
  :  L = [
  :      [' Apple ', ' Google ', ' Microsoft ',
Si   :      [' Java ', ' Python ', ' Ruby ', ' PHP '],
  :      [' Adam ', ' Bart ', ' Lisa ']
  :  ]
  £ º  print (l[0][0],l[1][1],l[2][2])

Learn about Python's list and tuple today