Setting financial year start month for UK format

I created this python code to create a python list with the financial year with quarters for a given range of dates for a given country format. It works with the USA, Australia, and Canada because all these countries' financial years start with 1 day each month. But in the UK it is the 6th of April of one particular year. So how do I solve this problem?

here is the full code of my custom function:

 def to_financial_year(start_date:str=None,start_end:str=None,current_format:str=None, financial_year_format:str=None):
    if current_format==None:
        return print('Please include the start_date in function argument')
        return
    elif start_date==None:
        return print('Please include the start_end in function argument')
        return
    elif start_end==None:
        return print('Please include the current_format in function argument')
        return
    elif financial_year_format==None:
        return print('Please include the financial_year_format in function argument')
        return
    else:
        start_date = start_date
        start_end=start_end
        
    if financial_year_format=="Australia":
        fiscalyear.START_MONTH = 7 
    elif financial_year_format=="USA":
        fiscalyear.START_MONTH = 10
    elif financial_year_format=="Canada":
        fiscalyear.START_MONTH = 4 
    elif financial_year_format=="UK":
        fiscalyear.START_MONTH = 4
    else:
        return print('Please enter valid financial_year_format country')
        return
        
    
    
    fiscalyear.START_MONTH = 7 
    
    try:
        date_obj1 = dt.strptime(start_date, current_format)
    except:
        return print(
            'Mismatch between in input start_date time and format that you entered or \n',sys.exc_info()[0],'error')
    try:
        date_obj2 = dt.strptime(start_end, current_format)
    except:
        return print(
             'Mismatch between in input start_end time and format that you entered or \n',sys.exc_info()[0],'error')
    list=[]
    step = dd.timedelta(days=1)
    while date_obj1 <= date_obj2:
        day=int(dt.strftime(date_obj1,"%d"))
        month=int(dt.strftime(date_obj1,"%m"))
        year=int(dt.strftime(date_obj1,"%Y"))
        jul_dt = fiscalyear.FiscalDate(year,month,day)
        k=str(jul_dt.fiscal_year)+"-"+"Q"+str(jul_dt.fiscal_quarter)
        list.append(k)
        date_obj1 += step
    print(list)