COMPUTER SCIENCE PROJECT ON
CERTIFICATE
This is to certify that PUSHPENDER RANA Student at J. D. Tytler
School has persuaded his work and prepared the present dissertation
entitled TELEPHONE BILLING SYSTEMUnder my guidance and supervision
this being submitted for partial fulfilment of the requirement for
senior secondary school certificate.
SupervisionMr. PRAVEEN BHATIAHead of Computer Science
DepartmentJ. D. Tytler School, New Rajinder NagarNew Delhi
110060ACKNOWLEDGEMENT
I would like to express my special thanks and gratitude to my
Computer Science teacher Mr. Praveen Bhatia for his valuable
guidance that leads to the successful completion of this project.
Also I would like to thank the principal of our school Mrs. Tytle
for giving me such an oportunity.
PUSHPENDER RANAXII-C
PYTHON PROGRAMMING LANGUAGEPython was created by Guido Van
Rossum when he was working at CWI (Centrum Wiskunde &
Informatica) which is a National Research Institute for Mathematics
and Computer Science in Netherlands. The language was released in
I991. Python got its name from a BBC comedy series from seventies-
Monty Pythons Flying Circus. Python can be used to follow both
Procedural approach and Object Oriented approach of programming. It
is free to use. Some of the features which make Python so popular
are as follows:- It is a general purpose programming language which
can be used for both scientific and non scientific programming. It
is a platform independent programming language. It is a very simple
high level language with vast library of add-on modules. It is
excellent for beginners as the language is interpreted, hence gives
immediate results. The programs written in Python are easily
readable and understandable. It is suitable as an extension
language for customizable applications. It is easy to learn and
use.
CLASSESClasses are the group of objects with same attributes and
common behaviour. A class is basically a blueprint for creating an
object in abject oriented programming language like python. Classes
allow data encapsulation as it combines the objects and the
associated functions into a single unit itself.Syntax to define a
class in python is as follows:-class :statement 1statement 2
FUNCTIONSFunctions is a set of instructions enclosed in a single
unit which can be executed as and when required by calling the
function.Syntax:-def :statement1statement2
BINARY FILEThe binary file contains arbitrary binary data.the
numbers in a binary file can be used for numerical
operations.Therefore while working on an arbitrary file we have to
convert the binary pattern into the desired data typr as required
by our program.Special methods like LOAD and DUMP help to
accomplish this task
Source
Code:-#=======================================================#
TELEPHONE BILLING
SYSTEM#=======================================================class
customer: cno='' ph='' name='' addr='' city='' def getdata(self):
import os os.system('cls') print("\n"*4)
self.ph=int(input("\n\t\t\tEnter The 8 Digit Telephone No. :"))
self.cno=int(input("\n\t\t\tEnter The Consumer No:"))
self.name=input("\n\t\t\tEnter Name:")
self.city=input("\n\t\t\tEnter City:")
self.addr=input("\n\t\t\tEnter Address:")
self.type=input('''\n\t\t\tEnter 'O' for Office Or 'Enter' for
residential:''') if self.type.upper()=='O': self.type='Office'
else: self.type='Home ' def showdata(self): import os
os.system('cls') print("\n"*4) print("\t\t\tPhone No:",self.ph)
print("\t\t\tConsumer No:",self.cno) print("\t\t\tName:",self.name)
print("\t\t\tCity:",self.city) print("\t\t\tAddress:",self.addr)
print("\t\t\tType:",self.type) def showcust(self):
print("\t\t",self.ph,"\t",self.cno,"\t",self.type,"
",self.name)#======================================================#CLASS
TO CALCULATE AND DISPLAY THE
BILL#=======================================================class
bill: def __init__(self): customer.__init__(self) self.ffcalls=100
self.oprd='' self.clrd='' self.mcalls=0 self.fcalls=100
self.credit='' self.debits='' self.chargec=0 self.chargem=0
self.tax=0 self.grossamt=0 self.surcharge=20 self.netamtbef=0
self.netamtaft=0 self.c=0 self.found=False
#=======================================================#
FUNCTION TO CALCULATE THE
BILL#======================================================= def
calbill(self): import pickle self.c=customer()
self.file=open("bill.dat","rb") self.phone='' import os
os.system('cls') print("\n"*4) while self.phone=='':
self.phone=input("\n\t\t\tEnter Telephone No. :")
self.phone=int(self.phone) self.found=False try: while True:
self.c=pickle.load(self.file) if self.c.ph==self.phone: self.found
=True break except EOFError: pass if self.found==False:
print("\n\t\t\tTelephone Number Not Found In The Records")
input("\n\t\t\tPress Any Key To Continue") return self.file.close()
self.ffcalls=100 while self.oprd=='':
self.oprd=input("\n\t\t\tEnter The Open Meter Reading:") while
self.clrd=='': self.clrd=input("\n\t\t\tEnter The Close Meter
Readng:") self.oprd=int(self.oprd) self.clrd=int(self.clrd)
self.mcalls=self.clrd-self.oprd if self.mcallsself.grossamt:
self.netamtbef=0 self.surcharge=0 else:
self.netamtbef=self.grossamt-self.credit
self.netamtaft=self.netamtbef+self.surcharge
#=======================================================#
FUNCTION TO CALCULATE THE
BILL#======================================================= def
dispbill(self): import os os.system('cls') print("\n"*4) if
self.found: print("\n") print("="*31,"Telephone Bill","="*32)
print("Name:",self.c.name) print("-"*79)
print("Address:",self.c.addr) print("="*79) print("Telephone
Number",end=' '*3) print("Consumer Number",end=' '*3)
print("Previous reading",end=' '*3) print("Current reading:")
print("="*79) print(self.c.ph,end=' '*11) print(self.c.cno,end='
'*12) print(self.oprd,end=' '*18) print(self.clrd) print("-"*79)
print("Metered Calls"," "*30,":"," "*9,self.mcalls) print("Free
Calls"," "*33,":"," "*9,self.fcalls) print("Chargable calls","
"*28,":"," "*9,self.chargec) print("Debits"," "*37,":","
"*9,self.debits) print("Taxes"," "*38,":"," "*9,self.tax)
print("Gross Amount"," "*31,":"," "*9,int(self.grossamt))
print("Credits"," "*36,":"," "*9,self.credit) print("-"*79)
print("Amount payable before"," "*22,":"," "*9,int(self.netamtbef))
print("-"*79) print("Surcharge"," "*34,":"," "*9,self.surcharge)
print("-"*79) print("Amount payable after"," "*23,":","
"*9,int(self.netamtaft)) print("="*79) input("\n\t\t\tPress any key
to continue")
#=======================================================#
FUNCTION TO ADD A NEW
CUSTOMER#=======================================================
def addrec(): import pickle file=open("bill.dat",'ab') c=customer()
import os while True: os.system('cls') print("\n"*4) c.getdata()
pickle.dump(c,file) ch=input("\n\t\t\tDo You Want To Enter More
Records:") if ch.upper()=='N': break
file.close()#=======================================================#
FUNCTION TO SHOW ALL THE CUSTOMERS FROM THE
FILE#=======================================================def
showrec(): import pickle file=open('bill.dat','rb') c=customer()
import os os.system('cls') print("\n"*4) print("\t\tPhone No.\t
Consumer No.\t Type\t Name") try: while True: c=pickle.load(file)
print('\n') c.showcust() except EOFError: pass file.close()
input("\n\t\t\tPress Any Key To Continue")def searchrec(): import
pickle file=open("bill.dat","rb") c=customer() import os
os.system('cls') print("\n"*4) phn=int(input("\n\t\t\tEnter The
Telephone No. :")) found=False try: while True: c=pickle.load(file)
if phn==c.ph: found=True break except EOFError: pass if found:
c.showdata() input("\n\t\t\tPress Enter To Continue") else:
print("\n\t\t\tRecord not found:") input("\n\t\t\tPress Enter To
Continue")
file.close()#=======================================================#
FUNCTION TO DELETE RECORD OF A CUSTOMER FROM THE
FILE#=======================================================def
delrec(): import pickle import os file=open("bill.dat","rb")
temp=open('temp.dat','ab') import os os.system('cls') print("\n"*4)
phone=int(input("\n\t\t\tEnter The Phone Number:")) c=customer()
try: while True: c=pickle.load(file) if c.ph==phone:
print("\n\t\t\tRecord Successfully Deleted") c.showdata()
input("\n\t\t\tPress any key to continue") pass elif c.ph!=phone:
pickle.dump(c,temp) except EOFError: pass file.close() temp.close()
os.remove('bill.dat')
os.rename('temp.dat','bill.dat')#=======================================================#
FUNCTION TO MODIFY DETAILS OF A
CUSTOMER#=======================================================def
modrec(): import pickle file = open("bill.dat", 'rb') clist =
list() i = 0 c = customer() import os os.system('cls')
print("\n"*4) phn = int(input("\n\t\t\tEnter The Telephone Number :
")) try: while True : c = pickle.load(file) clist.append(c); except
EOFError : pass file.close() found = False i = 0 for c in clist :
if ( c.ph==phn ) : found = True break else : i = i+1 if ( not found
) : print("\n\t\t\tInvalid Phone Number ") return import os
os.system('cls') print("\n"*4) print("\n\t\t\tEnter The New Details
About The Customer:") clist[i].getdata() file = open("bill.dat",
'wb') for c in clist : pickle.dump(c,file)
file.close()#=======================================================#
MAIN
MENU#=======================================================def
menu(): import os os.system('cls') print("\n"*4)
print("\n\t\t\t\tMAIN MENU") print("\n\t\t\tPress 1 : To Generate a
Bill") print("\n\t\t\tPress 2 : To List all Customers")
print("\n\t\t\tPress 3 : To Manage Customers") print("\n\t\t\tPress
4 : To
Exit")#=======================================================#
CUSTOMER
MENU#=======================================================def
menurec(): import os os.system('cls') print("\n"*4)
print("\n\t\t\t\tCUSTOMER MENU") print("\n\t\t\tPress 1 : To List
All Customer") print("\n\t\t\tPress 2 : To Add a Customer")
print("\n\t\t\tPress 3 : To Show Details About A Customer")
print("\n\t\t\tpress 4 : To Delete a Customer")
print("\n\t\t\tPress 5 : To Modify a Existing Customer")
print("\n\t\t\tPress 6 : To Go Back To Previous
Menu")#=======================================================#
MAIN#=======================================================opt=0while
opt!=4: menu() opt=int(input("\n\t\t\tEnter Your Choice:")) if
opt==1: b=bill() b.calbill() b.dispbill() elif opt==2: showrec()
elif opt==3: ropt=0 while ropt!=4: menurec()
ropt=int(input("\n\t\t\tEnter Your Choice:")) if ropt==1: showrec()
elif ropt==2: addrec() elif ropt==3: searchrec() elif ropt==4:
delrec() elif ropt==5: modrec() elif ropt==6: break else:
print("\n\t\t\tInvalid Choice") input("\n\t\t\tPress Any Key To
Continue") elif opt==4: print("\n\t\t\tGood Bye")
input("\n\t\t\tPress Any Key To Continue") break else:
print("\n\t\t\tInvalid Choice") input("\n\t\t\tPress Any Key To
Continue")
Output
