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Build class to make a Smart list - trying
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Build class to make a Smart list - trying
#1
Class

import datetime as dt


class Defaults:
    """Storage of Default Values"""

    dbConStr = "pass:Name:Database;"
    baseDate = dt.datetime(2000,12,31)
    baseVal = int(100)


class myStructure:
    """ My custom data structure for arrays """

    def __init__(self, date1=dt.datetime(2000,12,31), num1=0, str1="Nothing"):
        self.date1 = date1
        self.num1 = num1
        self.str1 = str1

        

class MySmartList():
        """ Smart list with field data IDs """

        def __init__(self):
            data = []

        def AddNewRec(self, date1="05/01/1950", num1=0, str1="Nothing"):
            #Accepted date format 05/01/1950
            zDate = dt.datetime.strptime(date1,"%m/%d/%Y")
            k = myStructure(zDate, num1, str1)
            data.append(k)
            
            
trying it out

# Smart List   
myData =[]
my.MySmartList.AddNewRec(myData,date1 = "05/01/1950",num1=100,str1='Test0')
my.MySmartList.AddNewRec(myData,date1 = "05/02/1950",num1=101,str1='Test1')
my.MySmartList.AddNewRec(myData,date1 = "05/03/1950",num1=102,str1='Test2')
Get error on bold line 5 >> data.append(k)

     def AddNewRec(self, date1="05/01/1950", num1=0, str1="Nothing"):
            #Accepted date format 05/01/1950
            zDate = dt.datetime.strptime(date1,"%m/%d/%Y")
            k = myStructure(zDate, num1, str1)
             data.append(k)
Newbie here, what am i doing wrong?
Reply
#2
Add self. in front of both data in MySmartList
Note: when you have an error, please post the full error traceback in error tags.
Reply
#3
changed the data.append(k) to self.data.append(k)

class MySmartList():
        """ Smart list with field data IDs """

        def __init__(self):
            self.data = []


        def AddNewRec(self, date1="05/01/1950", num1=0, str1="Nothing"):
            #Accepted date format 05/01/1950
            zDate = dt.datetime.strptime(date1,"%m/%d/%Y")
            k = myStructure(zDate, num1, str1)
            self.data.append(k)
My error now is
Error:
Traceback (most recent call last): File "C:\Users\RTT\Documents\Visual Studio 2017\Projects\Python_Test_Project\Python_Test_Project\Test1.py", line 48, in <module> my.MySmartList.AddNewRec(myData,date1 = "05/01/1950",num1=100,str1='Test0') File "C:\Users\RTT\Documents\Visual Studio 2017\Projects\Python_Test_Project\Python_Test_Project\myClass.py", line 33, in AddNewRec self.data.append(k) AttributeError: 'list' object has no attribute 'data'
From prev post, what do you mean self infront of MySmartList??
Reply
#4
Make an instance of MySmartList
then call the instance's AddNewRec method
Don't pass in a list to MySmartListit has its own internal list
my_smart_list = my.MySmartList()
my_smart_list.AddNewRec(date1 = "05/01/1950",num1=100,str1='Test0')
my_smart_list.AddNewRec(date1 = "05/02/1950",num1=101,str1='Test1')
my_smart_list.AddNewRec(date1 = "05/03/1950",num1=102,str1='Test2')
Reply
#5
Getting there

my class
import datetime as dt


class Defaults:
    """Exaample of Storage of Default Values"""

    dbConStr = "pass:Name:Database;"
    baseDate = dt.datetime(2000,12,31)
    baseVal = int(100)


class myStructure:
    """ My custom data structure for arrays """

    def __init__(self, date1=dt.datetime(2000,12,31), num1=0, str1="Nothing"):
        self.date1 = date1
        self.num1 = num1
        self.str1 = str1

        

class MySmartList():
        """ Smart list with field data IDs """

        def __init__(self): 
            self.data0 =[]

        #Add new records to data0 list via data structure object
        def AddNewRec(self,date1="05/01/1950", num1=0, str1="Nothing"):
            #Accepted date format 05/01/1950
            zDate = dt.datetime.strptime(date1,"%m/%d/%Y")
            self.data0.append(myStructure(zDate, num1, str1))
My smart list with a structure
myData=my.MySmartList()
myData.AddNewRec(date1 = "05/01/1950",num1=100,str1='Test0')
myData.AddNewRec(date1 = "05/02/1950",num1=101,str1='Test1')
myData.AddNewRec(date1 = "05/03/1950",num1=102,str1='Test2')


for index, myData in enumerate(myData):
   print(index, myData.str1 +  ' -- '  + str(myData.num1)  + ' -- ' + str(myData.date1))
Error on this line: for index, myData in enumerate(myData):

Traceback (most recent call last):
File "C:\Users\RTT\Documents\Visual Studio 2017\Projects\Python_Test_Project\Python_Test_Project\Test1.py", line 54, in <module>
for index, myData in enumerate(myData):
TypeError: 'MySmartList' object is not iterable

any ideas?
Reply
#6
You need enumerate(myData.data). Your class isn't a list, it just contains one. This is what I was saying in the other thread about overriding the other magic methods that sequences use (in this case __iter__) or sub-classing from a class that already has those methods.
Craig "Ichabod" O'Brien - xenomind.com
I wish you happiness.
Recommended Tutorials: BBCode, functions, classes, text adventures
Reply
#7
for index, myData in enumerate(myData.data0):
Reply
#8
SUCCESS
Reply


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