To write a program that keeps names and email addresses in a dictionary as key-value pairs check the code given below.
<h3>What is
key-value pairs?</h3>
In a key-value pair, two related data elements are combined: a value, which is a variable that belongs to the set (for example, male/female, green, 100), and a key, which is a constant that defines the data set (for example, gender, color, price).
A key-value pair could look something like this when fully formed:
gender = male
color = green
price > 100
↓↓↓//<u>Python code</u>//↓↓↓
import pickle
import sys
try:
f=open('email.dat','rb')
d=pickle.load(f)
f.close()
except:
d={}
while True:
print('\n1. Find a email address')
print('2. Add name and email address')
print('3. Change an email address')
print('4. Delete an email address')
print('5. Exit\n')
choice=input('\nEnter a choice: ')
if choice:
choice=int(choice)
else:
print('\nEnter a number')
continue
if choice == 1:
while True:
name=input('\nEnter the name ')
if name:
if name in d:
print('\n%s is the email id of %s \n' % (d[name],name))
break
else:
print('\n Email not found \n')
break
else:
print('\nName cannot be empty\n')
continue
elif choice==2:
while True:
name=input('\nEnter the name ')
if name:
break;
else:
print('\nName cannot be empty \n')
continue
while True:
email=input('\nEnter the email address ')
if email:
d[name]=email
break
else:
print('\nEmail cannot be empty\n')
continue
elif choice==3:
while True:
name=input('\nEnter the name to change the email address ')
if name:
if name in d:
email=input('\nEnter the new email address ')
d[name]=email
print('\nEmail address changed \n')
break;
else:
print('\nName not found \n')
break
else:
print('\nName cannot be empty \n')
continue
elif choice == 4:
while True:
name=input('\nEnter the name to remove ')
if name:
if name in d:
del d[name]
print('\nName and Email address removed \n ')
break;
else:
print('\nName not found \n')
break
else:
print('\nName cannot be empty\n')
continue
elif choice == 5:
f=open('email.dat','wb')
pickle.dump(d,f)
f.close()
sys.exit()
else:
print('\nEnter a valid choice ')
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