Lichen

Annotated tests/methods_changing.py

886:43f7a46d1e0d
267:4abc21c107cb
2019-02-01 Paul Boddie file changeset files shortlog Merged changes from trailing-data. float-preallocation
paul@267 1 
class C:
paul@267 2 
    def f(self):
paul@267 3 
        return 1
paul@267 4 
 
 paul@267      5 
    def g(self):
 
 paul@267      6 
        return self.f()
 
 paul@267      7 
 
 paul@267      8 
class D(C):
 
 paul@267      9 
    pass
 
 paul@267     10 
 
 paul@267     11 
def f():
 
 paul@267     12 
    return 2
 
 paul@267     13 
 
 paul@267     14 
c = C()
 
 paul@267     15 
d = D()
 
 paul@267     16 
 
 paul@267     17 
# Invoke a method that calls the default version of f.
 
 paul@267     18 
 
 paul@267     19 
print c.g()                 # 1
 
 paul@267     20 
print d.g()                 # 1
 
 paul@267     21 
 
 paul@267     22 
# Replace f in C and invoke the method again. For C, f will have changed,
 
 paul@267     23 
# but for D, f will retain its original value.
 
 paul@267     24 
 
 paul@267     25 
C.f = f
 
 paul@267     26 
 
 paul@267     27 
print c.g()                 # 2
 
 paul@267     28 
print d.g()                 # 1