The dictionary makes it less cubersome:
def my_form_processing(form):
    times=dict({'single_session_times':['0830-0930hrs', '0930-1030hrs', 
'1100-1200','1200-1300', '1400-1500', '1500-1600', '1600-1700'], 
'evening_single_session_times':['1730-1830', '1830-1930'],
'double_session_times':['0830-1030', '1100-1300', '1400-1700'],
'evening_double_session_times':['1730-1930']})


    if form.vars.class_session=='single session':
        the_time=random.choice(times['single_session_times'])
        form.vars.the_time2=the_time

    if form.vars.class_session=='evening single session':
        the_time=random.choice(times['evening_single_session_times'])
        form.vars.the_time2=the_time

    if form.vars.class_session=='double session':
        the_time2=random.choice(times['double_session_times'])
        form.vars.the_time2=the_time2

    if form.vars.class_session=='evening double session':
        the_time=random.choice(times['evening_double_session_times'])
        form.vars.the_time2=the_time

@auth.requires_login()
def index():
    form=SQLFORM(db.lecture)
    if form.process(onvalidation=my_form_processing).accepted:
        response.flash=T('Lecture Entered')
    return locals()

Thank you guys, much appreiated.

On Wednesday, July 15, 2020 at 11:20:01 PM UTC+2, villas wrote:
>
> We all have our styles of programming.  I would probably create a dict of 
> times. 
> But any idea which works is fine. Everyone looks at their old code and 
> sees a better way. 
> My motto is:  get something working and move on!  
>
>
>
> On Wednesday, 15 July 2020 19:26:33 UTC+1, mostwanted wrote:
>>
>> Thank you Villas, i updated my controller like this & its giving results. 
>> I a sure there is a better way to do this, a ore cleaner way & if anyone 
>> cares to improve my code please dont hesitate so i could update mine & 
>> learn more:
>>   
>> def my_form_processing(form):
>>     if form.vars.class_session=='single session':
>>         single_session_times=['0830-0930hrs', '0930-1030hrs', '1100-1200'
>> ,'1200-1300', '1400-1500', '1500-1600', '1600-1700']
>>         the_time=random.choice(single_session_times)
>>         form.vars.the_time2=the_time
>>
>>     if form.vars.class_session=='evening single session':
>>         evening_single_session_times=['1730-1830', '1830-1930']
>>         the_time=random.choice(evening_single_session_times)
>>         form.vars.the_time2=the_time
>>
>>     if form.vars.class_session=='double session':
>>         double_session_times=['0830-1030', '1100-1300', '1400-1700']
>>         the_time2=random.choice(double_session_times)
>>         form.vars.the_time2=the_time2
>>
>>     if form.vars.class_session=='evening double session':
>>         evening_double_session_times=['1730-1930']
>>         the_time=random.choice(evening_double_session_times)
>>         form.vars.the_time2=the_time
>>
>> @auth.requires_login()
>> def index():
>>     form=SQLFORM(db.lecture)
>>     if form.process(onvalidation=my_form_processing).accepted:
>>         response.flash=T('Lecture Entered')
>>     return locals()
>> Regards;
>>
>> Mostwanted
>>
>> On Wednesday, July 15, 2020 at 5:47:18 PM UTC+2, villas wrote:
>>>
>>> Before submission of form, use JS.
>>> or
>>> After submission,  allocate the time in the controller using 
>>> *onvalidation*.  See  
>>> http://www.web2py.com/books/default/chapter/29/07/forms-and-validators#onvalidation
>>>
>>> On Wednesday, 15 July 2020 13:58:28 UTC+1, mostwanted wrote:
>>>>
>>>> I thought it would be easy but its not, wrong values are being selected 
>>>> from wrong lists! After submitting a form I wanna check to see if the 
>>>> session field is either a single_session, double_session, 
>>>> evening_single_session or evening_double_session, depending on what it is 
>>>> I 
>>>> want time to be selected randomly from an appropriate list and inputted 
>>>> into the session_time field but wrong values from wrong lists are entered, 
>>>> information gets mixed up!
>>>>
>>>> model code:
>>>> db.define_table('lecture',
>>>>                 Field('subject_name', 'reference subject'),
>>>>                 Field('department', 'reference departments'), #HERE
>>>>                 Field('theLevels', label=SPAN('Levels'), requires=
>>>> IS_IN_SET(['1.1', '1.2', '2.1', '2.2', '3.1', '3.2', '4.1', '4.2'], 
>>>> zero='---Select A Level---')), #HERE
>>>>                 Field('lecturer', 'reference lecturer'),
>>>>                 Field('class_session', requires=IS_IN_SET(['single 
>>>> session', 'double session', 'evening single session', 'evening double 
>>>> session'], zero='----Select A Session Period----')),
>>>>                 Field('session_time', readable=False, writable=False),
>>>>                 Field('class_room', readable=False, writable=False),
>>>>                 Field('controller', readable=False, writable=False)
>>>>                )
>>>>
>>>> single_session_times=['0830-0930hrs', '0930-1030hrs', '1100-1200',
>>>> '1200-1300', '1400-1500', '1500-1600', '1600-1700']
>>>> double_session_times=['0830-1030', '1100-1300', '1400-1700']
>>>>
>>>> evening_single_session_times=['1730-1830', '1830-1930']
>>>> evening_double_session_times=['1730-1930']
>>>> '''
>>>> After submitting the form, have system scheck the session, if the 
>>>> session is any of whats defined give it a proper time
>>>> '''
>>>> if db.lecture.class_session=='single session':
>>>>     the_time=random.choice(single_session_times)
>>>>     db.lecture.session_time.default=the_time
>>>>
>>>>     
>>>> elif db.lecture.class_session=='evening single session':
>>>>     the_time=random.choice(evening_single_session_times)
>>>>     db.lecture.session_time.default=the_time
>>>>
>>>>     
>>>> elif db.lecture.class_session=='double session':
>>>>     the_time=random.choice(double_session_times)
>>>>     db.lecture.session_time.default=the_time
>>>>
>>>>     
>>>> elif db.lecture.class_session=='evening double session':
>>>>     the_time=random.choice(evening_double_session_times)
>>>>     db.lecture.session_time.default=the_time
>>>>
>>>>
>>>>
>>>> How can i achieve this with proper results from the intended list
>>>>
>>>> Mostwanted
>>>>
>>>

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