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Review Of Phython

Question
CBSEENCO12011678
Wired Faculty App

How is __init__() different from __del__() ?

Solution

__init__() is the class constructor or initialization method which is automatically invoked when we create a new instance of a class.

__del__() is a destructor which is automatically invoked when an object (instance) goes out of scope.

For Example:

class Sample:
	def __init__(self):
		self.data = 79
		print('Data:',self.data,'created')
	def __del__(self):
		print('Data:',self.data,'deleted')
s = Sample()
del s

Some More Questions From Review of Phython Chapter

Rewrite the following code in python after removing all syntax error(s). Underline each correction done in the code.

STRING=''WELCOME
NOTE''
for S in range[0,8]:
print STRING(S)
print S+STRING

Find and write the output of the following python code:

TXT = ['20','50','30','40']
CNT = 3
TOTAL = 0
for C in [7,5,4,6]:
	T = TXT[CNT]
	TOTAL = float (T) + C
	print

Find and write the output of the following python code:

class INVENTORY:
def __init__(self,C=101,N='Pad',Q=100): #constructor
     self.Code=C
     self.IName=N
     self.Qty=int(Q);
def Procure(self,Q):
     self.Qty = self.Qty + Q
def Issue(self,Q):
     self.Qty -= Q
def Status(self):
print self.Code,':',self.IName,'#',self.Qty
I1=INVENTORY()
I2=INVENTORY(105,'Thumb Pin',50)
I3=INVENTORY(102,'U Clip')
I1.Procure(25)
I2.Issue(15)
I3.Procure(50)
I1.Status()
I3.Status()
I2.Status()

What is the possible outcome(s) executed from the following code? Also, specify the maximum and minimum values that can be assigned to variable N.

import random
NAV = ['LEFT','FRONT','RIGHT','BACK'];
NUM = random.randint(1,3)
NAVG = ''
for C in range(NUM,1,-1):
	NAVG = NAVG+NAV[I]
	print NAVG
(i)BACKRIGHT (ii)BACKRIGHTFRONT
(iii) BACK (iv) LEFTFRONTRIGHT

Write definition of a method EvenSum(NUMBERS) to add those values in the list of NUMBERS, which are odd.

Out of the following, find those identifiers, which can not be used for naming Variable or Functions in a Python program:

_Cost, Price*Qty, float, Switch,
Address One, Delete, Number12, do

Name the Python Library modules which need to be imported to invoke the following functions
(i) load()
(ii) pow()

Rewrite the following code in python after removing all syntax error(s). Underline each correction done in the code.

for Name in [Amar, Shveta, Parag]
     IF Name[0]='S':
          print(Name)

Find and write the output of the following python code:

Numbers=[9,18,27,36]
for Num in Numbers:
	for N in range(1, Num%8):
		print(N,'#',end= '' )
	print()

 

Find and write the output of the following python code:
class Notes:

	def __init__(self,N=100,Nt='CBSE'): #constructor
		self.Nno=N
		self.NName=Nt

	def Allocate(self, N,Nt):
		self.Nno= self.Nno + N
		self.NName= Nt + self.NName

	def Show(self):
		print(self.Nno,'#',self.NName)

s=Notes()
t=Notes(200)
u=Notes(300,'Made Easy')
s.Show()
t.Show()
u.Show()
s.Allocate(4, 'Made ')
t.Allocate(10,'Easy ')
u.Allocate(25,'Made Easy')
s.Show()
t.Show()
u.Show()

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