[ Show class of custom sequence type ,iter , iterables and iterator using example of tuple ]
show class of custom sequence type ,iter , iterables and iterator using example of tuple
class CustomTupleIter:
"""
This is the space to do documentation related to class.
"""
def __init__(self):
self.list_ = (1,2,3,4)
def __len__(self):
return len(self.list_)
def __getitem__(self, i):
if isinstance(i, int):
if i<0:
i = len(self.list_) + i
if i<0 or i>=len(self.list_):
raise IndexError('Invalid Input')
else:
return self.list_[i]
def __iter__(self):
return self.CustomTupleIterator(self)
class CustomTupleIterator:
def __init__(self, other):
self.count = 0
self.other = other
def __iter__(self):
return self
def __next__(self):
if self.count < len(self.other.list_):
self.count += 1
return self.other.list_[self.count]
else:
raise StopIteration
clone of orginal list with two functionality i. iterating and sequence
class CustomListIter:
"""
This is the space to do documentation related to class.
"""
def __init__(self):
self.list_ = [1,2,3,4]
def __len__(self):
return len(self.list_)
def __getitem__(self, i):
if isinstance(i, int):
if i<0:
i = len(self.list_) + i
if i<0 or i>=len(self.list_):
raise IndexError('Invalid Input')
else:
return self.list_[i]
def __iter__(self):
return self.CustomListIterator(self)
class CustomListIterator:
def __init__(self, other):
self.count = 0
self.other = other
def __iter__(self):
return self
def __next__(self):
if self.count < len(self.other.list_):
self.count += 1
return self.other.list_[self.count]
else:
raise StopIteration
Write a class that act like squares and should print the squares of values and and cuustom sequence type.
class Square:
def __init__(self, n):
self.n = n
def __iter__(self):
return self.show_sq(self.n)
@staticmethod
def show_sq(n):
for i in range(n):
yield i**2
def __getitem__(self, i):
if isinstance(i, int):
if i < = self.n:
print(i**2)
else:
raise ValueError('Index out of bound')
fibonaaci using generator
def fibo(n):
x = 0
yield x
y = 1
yield y
for i in range(n-1):
x, y = y, x+y
yield y
show generator is faster than list
def show_gen_fast():
from timeit import timeit
dt = timeit("[num for num in fib(100) ]", globals = globals(), number=1)
return dt
Add two strings
def add_str(str1,str2):
return str1 + str2
we are dealing with multiple inheritance
class A(object):
def foo(self):
print("class A")
class B(object):
def foo(self):
print("class B")
class C(A, B):
pass
This is how pass works in case of multiple inheritance
class A1(object):
def foo(self):
print("class A1")
class B1(A1):
pass
class C1(A1):
def foo(self):
print("class C1")
class D1(B1,C1):
pass
