python __repr__ vs __str__ and cast variable, isinstance tuple vs list, dict for repr(), str(), int(), eval(code or string)

class Point3D(object):

def __init__(self, x, y, z):

self.x = x

self.y = y

self.z = z

def __repr__(self):

return str(self.z)

def __str__(self):

return "(%s, %s, %s)" % (self.x, self.y, self.z)

my_point = Point3D(1, 2, 3)

print(my_point)

v = str(repr(my_point))

b = isinstance(v, str)

if b:

v1 = int(v) + 1

s = str(v1) + ';'

print(s)

else:

print(b, ";")

print(isinstance(('a', 'b'), tuple))

print(isinstance(['a', 'b'], list))

dic = {'abc': 'abc', 'def': {'a1': 'a1v', 'a2': 'a2v'}}

for elem in dic.values():

if isinstance(elem, dict):

for ndx, item in elem.items():

print(ndx, ' => ', item, 'is ')

for i in item:

print(i)