rename

Author: NitkarshChourasia

1 File handle/File handle binary/Update a binary file2.py

@@ -27,3 +27,7 @@ def update():
 
 
 update()
+
+# ! Instead of AB use WB?
+# ! It may have memory limits while updating large files but it would be good
+# ! Few lakhs records would be fine and wouln't create any much of a significant issues

1 File handle/File handle binary/Deleting record in a binary file.py renamed to 1 File handle/File handle binary/delete.py

@@ -1,38 +1,44 @@
-import pickle
-import os
-import logging
-
-logging.basicConfig(level=logging.INFO, format='%(levelname)s: %(message)s')
-
-
-def b_read():
-    # Opening a file & loading it
-    if not os.path.exists("student_records.pkl"):
-        logging.warning("File not found")
-        return
-
-    with open("student_records.pkl", "rb") as F:
-        student = pickle.load(F)
-        logging.info("File opened successfully")
-        logging.info("Records in the file are:")
-        for i in student:
-            logging.info(i)
-
-def b_modify():
-    # Deleting the Roll no. entered by user
-    if not os.path.exists("student_records.pkl"):
-        logging.warning("File not found")
-        return
-    roll_no = int(input("Enter the Roll No. to be deleted: "))
-    student = 0
-    with open("student_records.pkl", "rb") as F:
-        student = pickle.load(F)
-
-    with open("student_records.pkl", "wb") as F:
-        rec = [i for i in student if i[0] != roll_no]
-        pickle.dump(rec, F)
-
-
-
-b_read()
-b_modify()
+import logging
+import os
+import pickle
+
+from dotenv import load_dotenv
+
+base = os.path.dirname(__file__)
+load_dotenv(os.path.join(base, ".env"))
+
+logging.basicConfig(level=logging.INFO, format="%(levelname)s: %(message)s")
+student_record = os.getenv("STUDENTS_RECORD_FILE")
+
+
+def b_read():
+    # Opening a file & loading it
+    if not os.path.exists(student_record):
+        logging.warning("File not found")
+        return
+
+    with open(student_record, "rb") as F:
+        student = pickle.load(F)
+        logging.info("File opened successfully")
+        logging.info("Records in the file are:")
+        for i in student:
+            logging.info(i)
+
+
+def b_modify():
+    # Deleting the Roll no. entered by user
+    if not os.path.exists(student_record):
+        logging.warning("File not found")
+        return
+    roll_no = int(input("Enter the Roll No. to be deleted: "))
+    student = 0
+    with open(student_record, "rb") as F:
+        student = pickle.load(F)
+
+    with open(student_record, "wb") as F:
+        rec = [i for i in student if i[0] != roll_no]
+        pickle.dump(rec, F)
+
+
+b_read()
+b_modify()

1 File handle/File handle binary/question 1 (elegible for remedial, top marks).py

@@ -8,10 +8,12 @@
 
 
 """
+
 # also find no. of children who got top marks
 
 import pickle
 
+# ! Making a generator would be lovely a fake data generator for testing purposes
 list = [
     [1, "Ramya", 30],
     [2, "vaishnavi", 60],

1 File handle/File handle binary/File handle binary read (record in non list form).py renamed to 1 File handle/File handle binary/read.py

@@ -1,22 +1,22 @@
-import pickle
-
-
-def binary_read():
-    with open("studrec.dat", "rb") as b:
-        stud = pickle.load(b)
-        print(stud)
-
-        # prints the whole record in nested list format
-        print("contents of binary file")
-
-        for ch in stud:
-            print(ch)  # prints one of the chosen rec in list
-
-            rno = ch[0]
-            rname = ch[1]  # due to unpacking the val not printed in list format
-            rmark = ch[2]
-
-            print(rno, rname, rmark, end="\t")
-
-
-binary_read()
+import pickle
+
+
+def binary_read():
+    with open("studrec.dat", "rb") as b:
+        stud = pickle.load(b)
+        print(stud)
+
+        # prints the whole record in nested list format
+        print("contents of binary file")
+
+        for ch in stud:
+            print(ch)  # prints one of the chosen rec in list
+
+            rno = ch[0]
+            rname = ch[1]  # due to unpacking the val not printed in list format
+            rmark = ch[2]
+
+            print(rno, rname, rmark, end="\t")
+
+
+binary_read()

1 File handle/File handle binary/Update a binary file.py renamed to 1 File handle/File handle binary/update2.py

@@ -1,30 +1,30 @@
-# Updating records in a binary file
-
-import pickle
-
-
-def update():
-    with open("class.dat", "rb+") as F:
-        S = pickle.load(F)
-        found = False
-        rno = int(input("enter the roll number you want to update"))
-
-        for i in S:
-            if rno == i[0]:
-                print(f"the currrent name is {i[1]}")
-                i[1] = input("enter the new name")
-                found = True
-                break
-
-        if found:
-            print("Record not found")
-
-        else:
-            F.seek(0)
-            pickle.dump(S, F)
-
-
-update()
-
-with open("class.dat", "rb") as F:
-    print(pickle.load(F))
+# Updating records in a binary file
+# ! Have a .env file please
+import pickle
+
+
+def update():
+    with open("class.dat", "rb+") as F:
+        S = pickle.load(F)
+        found = False
+        rno = int(input("enter the roll number you want to update"))
+
+        for i in S:
+            if rno == i[0]:
+                print(f"the currrent name is {i[1]}")
+                i[1] = input("enter the new name")
+                found = True
+                break
+
+        if found:
+            print("Record not found")
+
+        else:
+            F.seek(0)
+            pickle.dump(S, F)
+
+
+update()
+
+with open("class.dat", "rb") as F:
+    print(pickle.load(F))