adds-edits-list.py

gistfile1.txt

import sys
class InvIn(ValueError): pass
def main():
  filename = get_string("Choose filename", name = "filename", default = "test")
  flagNS = False
  Editing = False
  TheSet = set()
  User = None
  MakeOrFind(filename)
  while(True):
    User = get_string("{0} {1} [Q]uit".format(lambda Editing: "[A]dd, [D]elete" if Editing == True else "", lambda flagNS : "[S]ave" if flagNS == True else ""),
                      name = "entity", default = "a" if Editing ==True else None).lower()
    if Editing == True:
      if User == "a":
        AddNote(get_string("Add an item:"))
        WriteAll()
        flagNS = True
      if User == "d":
        RemNote(get_integer("position of removing? 0 to cancel:"))
        WriteAll()
        flagNS = True
      if User == "s":
        Saving()
        flagNS = False
      break
    if User == "q" and flagNS == True:
      answer = get_string("save changes? y/n", name = "answer", defailt = "y") 
      if answer = "y":
        Saving()
      Quit()
    print("wrong command")
    
    #code else -- "invalid entity"

        
    
def MakeOrFind(filename):
    try:
        #makes or finds files
        stream = open(filename.lst , 'a')
        Editing = True
    except: InvIn
        "sorry, start again"
def MakeASet(): #done
        #makes the set TheSet
    TheSet = set(stream.read().split())
def AddNote(addname):
    #just add the note done
    TheSet.add(addname)
    
def RemNote(number):
    #remove from file and sort done
    if number ! = 0:
        try:
            deleted = sorted(TheSet)[number-1]
            TheSet.remove(deleted)
        except: KeyError:
            print("wrong number")

              
def Saving():
    #saves when S pressed done
    filename.write( " ".join(TheSet)
    print( "Saved {0} item{s} in {1}.lst".format(len(TheSet), filename, s = "" if len(TheSet) = 1 else "s" )
def Quit():
    #quitting done
    sys.exit(0)
def WriteAll():
    #takes a set, sorts it and writes it with numbers done
      if len(TheSet) == 0: print("{0}no elements{0}".format("----------")
      pos = 1
      for item in sorted(TheSet):
          print( "{0}: {1}".format( pos , item))
          pos += 1
    
    
    
    
    
    
    # additional functions, they are OK
def get_string(message, name="string", default=None,
               minimum_length=0, maximum_length=80):
    message += ": " if default is None else " [{0}]: ".format(default)
    while True:
        try:
            line = input(message)
            if not line:
                if default is not None:
                    return default
                if minimum_length == 0:
                    return ""
                else:
                    raise ValueError("{0} may not be empty".format(
                                     name))
            if not (minimum_length <= len(line) <= maximum_length):
                raise ValueError("{0} must have at least {1} and "
                        "at most {2} characters".format(
                        name, minimum_length, maximum_length))
            return line
        except ValueError as err:
            print("ERROR", err)

def get_integer(message, name="integer", default=None, minimum=0, 
                maximum=100, allow_zero=True):

    class RangeError(Exception): pass

    message += ": " if default is None else " [{0}]: ".format(default)
    while True:
        try:
            line = input(message)
            if not line and default is not None:
                return default
            i = int(line)
            if i == 0:
                if allow_zero:
                    return i
                else:
                    raise RangeError("{0} may not be 0".format(name))
            if not (minimum <= i <= maximum):
                raise RangeError("{0} must be between {1} and {2} "
                        "inclusive{3}".format(name, minimum, maximum,
                        (" (or 0)" if allow_zero else "")))
            return i
        except RangeError as err:
            print("ERROR", err)
        except ValueError as err:
            print("ERROR {0} must be an integer".format(name))