foobar

file_handling_3.py

@@ -22,18 +22,29 @@
 # Creating / opening / closing binary files
 #  
 
-dfile = open("student_new.dat","ab")  # b specifies to open it in binary mode
-data = {}  ## creating an empty dictionary
+dfile = open("student_new.dat","rb+")  # b specifies to open it in binary mode
+data_w = {}  ## creating an empty dictionary for writing purpose
+data_r = {}  ## creating an empty dictionary for reading purpose
+ ## reading the file 
+try :
+    print("file student_new.dat conains the following records :")
+    while True:         ## sets to false if end of file is encountered
+        data_r = pickle.load(dfile)
+        print(data_r)
+except EOFError:
+    dfile.close()
+
+dfile = open("student_new.dat","ab+")
 No_of_stdnt = int(input("enter the no of students in class :"))
 for i in range(No_of_stdnt):
     name = input("Enter the name of the student :")
     roll = int(input("enter the roll no of the student :"))
     marks = int(input("eneter the marks obtained by the student :"))
-    data['Name'] = name
-    data['Roll'] = roll
-    data['Marks'] = marks
-    ## the above three lines fillup the dictionary
-    pickle.dump(data,dfile)
+    data_w['Name'] = name
+    data_w[ 'Roll'] = roll
+    data_w[ 'Marks'] = marks
+    ## thedata_r  above three lines fillup the dictionary
+    pickle.dump(data_w,dfile)
 
 dfile.close()