Python - problem with if/elif and use of default table value

I have a mysql table with one of the columns  ALPAID_ytd  acting as a switch. The default value for the column is 0 (zero) and this represents the off position. The column is changed to a value of 1 when the switch is on. This switch is programmed on/of as the user deploys the application. Below is an image of the mysql panel showing the setup.

While I have no problems switching on/off and updating the table, I have a major probLem in using the values in a set of if/elif filters which  feed a table with purchase information. For example

if ALPAID_ytd != 0 and status == 1:
            print ("elif ALPAID_ytd != 0 and status == 1: fired")
            
        elif ALPAID_ytd != 1 and status == 1:
            print("elif ALPAID_ytd != 1 and status == 1: fired")

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In the above, !=0 gets me the value 1. No problem
However, != 1 does not resolve to 'NOT EQUAL 1' (zero)  but rather  to !=0  which is 1.  ==0 resolves exactly the same way.
Consequently it is not possible to run the filters as I cannot catch the value 0.


mysql panel showing default setting

Here is an output example showing the problem.  Note that the actual value of ALPAID_ytd is 0, but 1 gets inserted into the  if/elif code.

output example from attached code page
Finally, here is the code from my testing page.  I have set the value of ALPAID_ytd to 0 (the problem value). The variable "status"  is a descriptor for the order (mylist). There are three possibilities  which are defined by the mylist sublists

2 ........  eg   mylist = ['1008', [4], [4], [4]]
0.........  eg   mylist = ['1008', [4], [29], [4]]
1 ..........eg   mylist = ['1008', [29], [29], [29]]

You could plug these into line 88 of the code to use different values of "status" - although I do not believe this is connected to the problem

Hopefully you can spot a solution (excluding changing the default value of  ALPAID_ytd to 0  !!)

James




#!C:\Python34\python.exe
import collections
import cgi,cgitb
import mysql.connector as conn
def htmlTop():
    print("""Content-type:text/html\n\n
        <!DOCTYPE html>
        <html lang="en">
            <head>
                <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
                <title> My Server-side template</title>
        </head>
        <body>""")

def htmlTail():
    print(""" its done</body>
        </html>""")

def connectDB():
    db=conn.connect(host='localhost' ,user='root' ,passwd='844cheminduplan' ,db='office')
    cursor = db.cursor()
    return db, cursor 


    
def activityinfo(db,cursor,courseNumber):
    cursor.execute("""select courseNumber,Activity, tariffstwelve, tariffsthirtysix from activities WHERE courseNumber = "%s" """
    %(courseNumber)) 
    activitydata = cursor.fetchall()
    return activitydata



    
def SelectALPAID_ytd(db,cursor):
    cursor.execute("""select ALPAID_ytd from registrations WHERE memberID = "%s" """
    %(memberID)) 
    ALPAID_ytd=cursor.fetchall()
    return ALPAID_ytd



def OrderProfiler(mylist,db,cursor):
    # provides a list of 1s nd 0eros to describe the list in terms of paid and activity libre activities
    OrderProfile = []
    #del mylist[0] # chopping off the memberID
    mylist = mylist[1]  +  mylist[2]  + mylist[3]
    print(mylist, "this is mylist")
    for each in mylist:
        courseNumber = each
        activitydata =  activityinfo(db,cursor,courseNumber)
        #print(activitydata, "this is activity data")
        #Note activitydata[0][2] is price for 12 trim and activitydata[0][3] is for 36 trim
        if activitydata[0][2] == 0 and activitydata[0][3] == 0:
            OrderProfile.append(0) #activityLibre
        elif activitydata[0][2] >0 and activitydata[0][3] > 0:
            OrderProfile.append(1) # paid
    return OrderProfile
    
def StatusFinder (OrderProfile):
    # declares an order as being mixed (0), activity libre only(1) or paid only(2) items
    # uses OrderProfile list from OrderProfiler(mylist, db, cursoro) above
    # this status along with the ALPAID_YTD flag  in registrations table determines if DELTA ORDER should be
    # charged the activity libre registration fee, or should be reimboursed the activity libre registration fee
    print (collections.Counter(OrderProfile))
    OrderProfileCount = (collections.Counter(OrderProfile))
    if OrderProfile.count(1) >0 and OrderProfile.count(0) >0:
        print(OrderProfile, "OrderProfile")
        status = 0 #mixed
    elif OrderProfile.count(1) >0 and OrderProfile.count(0)== 0:
        status = 2 #paid_only
    elif OrderProfile.count(1) ==0 and OrderProfile.count(0)>0:
        status = 1 #free_only
    return status
        
        




#main program
if __name__== "__main__":
    try:
        htmlTop()
        
        print("--------------------------------------------------------------")
        db,cursor=connectDB()
        mylist = ['1008', [29], [29], [29]]
        OrderProfile = OrderProfiler(mylist,db,cursor)
        status = StatusFinder (OrderProfile)
        print(status, "this is order status")
        memberID = mylist[0]
        print (memberID, "this is memberID")
        ALPAID_ytd = SelectALPAID_ytd(db,cursor)
        ALPAID_ytd = ALPAID_ytd [0][0]
        print(ALPAID_ytd, "this is ALPAID_ytd - the on/off switch. Default in table is 0(off) and 1(on)")
            
        print("..........................................")
        
                       
            
        if ALPAID_ytd != 0 and status == 1:
            print ("elif ALPAID_ytd != 0 and status == 1: fired")
            
        elif ALPAID_ytd != 1 and status == 1:
            print("elif ALPAID_ytd != 1 and status == 1: fired")
            
        elif ALPAID_ytd != 0 and status == 2:
            print ("elif ALPAID_ytd != 0 and status == 2: fired")        
            
        elif ALPAID_ytd != 1 and status == 2:
            print ("elif ALPAID_ytd != 1 and status == 2:fired")
            
           
        elif ALPAID_ytd != 0 and status == 0:
            print ("elif ALPAID_ytd != 0 and status == 0: fired")        

        elif ALPAID_ytd != 1 and status == 0:
            print ("elif ALPAID_ytd != 1 and status == 0:fired")        
            
        else:
            print("no result")
            
        
                
        
        htmlTail()
    except:
        cgi.print_exception()

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jameskaneAsked:
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Mark BradyPrincipal Data EngineerCommented:
The first issue I see is that table setup for that field. If you set it up as a varchar you should be single quoting the values because it is expecting a string and you are putting in integers into your query. This filed type should be changed to tinyint with a default of 0
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Nas-BanovCommented:
The table stores the values as strings and as such you get in `ALPAID_ytd` the strings '0' and '1' - not the numbers 0 and 1 your if's are checking for. As such, your != comparisons will be always false
>>> '0'!=0, '0'!=1, '1'!=0, '1'!=1
(True, True, True, True)

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In your code as-is, just change to check for '0' and '1' strings. Long term, maybe check for equality rather than inequality (that might have helped you to spot the problem earlier. maybe)
1
jameskaneAuthor Commented:
Mark and Nas,

PROBLEM SOLVED !!!!

Many thanks to you both for the help. and insight.

Guess I need to swot up some on mysql server !!

James
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