from packname import func1, func2, func3

import packname.func1, packname.func2, packname.func3

some_var = 'var1'
if some_var ==  'var1':
    from packeg1 import func
elsif some_var ==  'var2':
    from packeg2 import func
elsif some_var ==  'var3':
    from packeg3 import func
.....