def varkw(var1, var2='a', **kwargs):
    print('var1 =', var1)
    print('var2 =', var2)
    print('kwargs =', kwargs)
    print('-----')

varkw(1)
varkw(1, 2)
varkw(1, var2='b')
varkw(1, 'b', var3 = 'c', var4=5,var5=10, cat='Felus catus')