Insert an item into sorted list in Python

Question

I m creating a class where one of the methods inserts a new item into the sorted list  The item is inserted in the corrected  sorted  position in the sorted list  I m not allowed to use any built-in list functions or methods other than             and len though  This is the part that s really confusing to me   What would be the best way in going about this

User · Answer

This is the best way to append the list and insert values to sorted list    a      num   int input  How many numbers      for n in range num        numbers   int input  Enter values          a append numbers    b   sorted a  print b  c   int input  enter value     for i in  range len b         if b i   gt  c           index   i          break d   b  i     c    b i   print d

User · Answer

Use the insort function of the bisect module    import bisect  a    1  2  4  5   bisect insort a  3   print a    Output   1  2  3  4  5

User · Answer

Hint 1   You might want to study the Python code in the bisect module   Hint 2   Slicing can be used for list insertion    gt  gt  gt  s     a    b    d    e    gt  gt  gt  s 2 2      c    gt  gt  gt  s   a    b    c    d    e

User · Answer

I m learning Algorithm right now  so i wonder how bisect module writes  Here is the code from bisect module about inserting an item into sorted list  which uses dichotomy   def insort right a  x  lo 0  hi None          Insert item x in list a  and keep it sorted assuming a is sorted      If x is already in a  insert it to the right of the rightmost x      Optional args lo  default 0  and hi  default len a   bound the     slice of a to be searched               if lo  lt  0          raise ValueError  lo must be non-negative       if hi is None          hi   len a      while lo  lt  hi          mid    lo hi   2         if x  lt  a mid               hi   mid         else              lo   mid 1     a insert lo  x

User · Answer

You should use the bisect module  Also  the list needs to be sorted before using bisect insort left   It s a pretty big difference    gt  gt  gt  l    0  2  4  5  9   gt  gt  gt  bisect insort left l 8   gt  gt  gt  l  0  2  4  5  8  9   timeit timeit  l append 8   l   sorted l   setup  l    4 2 0 9 5   import bisect  l   sorted l   number 10000      1 2235019207000732  timeit timeit  bisect insort left l 8   setup  l    4 2 0 9 5   import bisect  l sorted l   number 10000      0 041441917419433594

User · Answer

function to insert a number in an sorted list   def pstatement value returned       return print  new sorted list     value returned    def insert input  n       print  input list      input      print  number to insert      n      print  range to iterate is     len input        first   input 0      print  first element     first      last   input -1      print  last element     last       if first  gt  n          list    n    input            return pstatement list      elif last  lt  n          list   input       n          return pstatement list      else          for i in range len input                if input i   gt  n                  break     list   input  i     n    input i       return pstatement list     Input values listq    2  4  5  n   1  insert listq  n

User · Answer

This is a possible solution for you   a    15  12  10  b   sorted a  print b   -- gt  b    10  12  15  c   13 for i in range len b        if b i   gt  c          break d   b  i     c    b i   print d   -- gt  d    10  12  13  15

[python] Insert an item into sorted list in Python

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