A.super-class constructor is invoked implicitly during constructor execution

B.the constructor can be invoked directly under strictly defined circumstances

C.the constructor's first parameter identifies an object currently being created

D.the constructor cannot use the default values of the parameters

A.class Class_4 (D, A) : pass

B.class Class_3(A,C): pass

C.class Class_2(B,D): pass

D.class Class_1(C,D): pass

A.from pypack import module_a

B.import module_a

C.import pypack.module_a

D.import module_a from pypack

A.lambda (x, y): x ** y

B.def lambda (x, y): return x ** y

C.lambda x, y: x ** y

D.lambda (x, y) = x ** y

A.an exception is raised

B.4

C.3

D.5