Write a function in to search and display details of all trains,whose destination is Delhi from a bi
Q. Write a function in to search and display details of all trains, whose destination is Delhi from a binary file TRAIN.DAT. Assuming the binary file is containing the objects of the following dictionary type:
Train = { 'Tno': ___, ‘From’: ____, 'To' : ____}
Website Link :-
https://www.pathwalla.com/2020/10/wri...
Answer :-
import pickle
def search() :
file = open("TRAIN.DAT","rb")
found = 0
try :
while True :
Train = pickle.load(file)
if Train [ "To" ] == 'Delhi':
print(Train)
found=1
except EOFError :
if found == 0:
print("Not found !!!")
file.close()
search()
Program for writing in the binary file :-
import pickle
f = open("TRAIN.DAT","wb")
while True :
Tno = int(input("Enter Train number ( 1 for exit ) : "))
if Tno == -1 :
break
From = input("Enter Station name :- ")
To = input("Enter Station name where that train will go:- ")
Train = { 'Tno': Tno , 'From': From , 'To' : To }
pickle.dump( Train , f)
print("Your file is ready.")
f.close()
The output of the above program :-
Enter Train number ( 1 for exit ) : 456365
Enter Station name :- Kota
Enter the Station name where that train will go:- Mub
Enter Train number ( 1 for exit ) : 53764
Enter Station name :- Kota
Enter the Station name where that train will go:- Delhi
Enter Train number ( 1 for exit ) : 45343
Enter Station name :- Pray
Enter the Station name where that train will go:- JK
Enter Train number ( 1 for exit ) : 34356
Enter Station name :- Delhi
Enter the Station name where that train will go:- Mub
Enter Train number ( 1 for exit ) : 93641
Enter Station name :- JK
Enter the Station name where that train will go:- Delhi
Enter Train number ( 1 for exit ) : 63444
Enter Station name :- Mub
Enter the Station name where that train will go:- Delhi
Enter Train number ( 1 for exit ) : -1
Your file is ready.
The output of Main progarm :-
{'Tno': 53764, 'From': 'Kota', 'To': 'Delhi'}
{'Tno': 93641, 'From': 'JK', 'To': 'Delhi'}
{'Tno': 63444, 'From': 'Mub', 'To': 'Delhi'}