CODE OPTIMIZATION (1 File handle scripts)

Author: OfficialAhmed

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

@@ -10,11 +10,7 @@ def bdelete():
     # Deleting the Roll no. entered by user
     rno = int(input("Enter the Roll no. to be deleted: "))
     with open("studrec.dat") as F:
-        rec = []
-        for i in stud:
-            if i[0] == rno:
-                continue
-            rec.append(i)
+        rec = [i for i in stud if i[0] != rno]
         pickle.dump(rec, F)
 
 

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

@@ -4,30 +4,27 @@
 
 
 def update():
-    F = open("class.dat", "rb+")
-    S = pickle.load(F)
-    found = 0
-    rno = int(input("enter the roll number you want to update"))
-    for i in S:
-        if rno == i[0]:
-            print("the currrent name is", i[1])
-            i[1] = input("enter the new name")
-            found = 1
-            break
+    with open("class.dat", "rb+") as F:
+        S = pickle.load(F)
+        found = False
+        rno = int(input("enter the roll number you want to update"))
 
-    if found == 0:
-        print("Record not found")
+        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
 
-    else:
-        F.seek(0)
-        pickle.dump(S, F)
+        if found:
+            print("Record not found")
 
-    F.close()
+        else:
+            F.seek(0)
+            pickle.dump(S, F)
 
 
 update()
 
-F = open("class.dat", "rb")
-val = pickle.load(F)
-print(val)
-F.close()
+with open("class.dat", "rb") as F:
+    print(pickle.load(F))

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

@@ -1,31 +1,30 @@
-# updating records in a bnary file
+# updating records in a binary file
 
 import pickle
 
 
 def update():
-    File = open("studrec.dat", "rb+")
-    value = pickle.load(File)
-    found = 0
-    roll = int(input("Enter the roll number of the record"))
-    for i in value:
-        if roll == i[0]:
-            print("current name", i[1])
-            print("current marks", i[2])
-            i[1] = input("Enter the new name")
-            i[2] = int(input("Enter the new marks"))
-            found = 1
-
-    if found == 0:
-        print("Record not found")
-
-    else:
-        pickle.dump(value, File)
-        File.seek(0)
-        newval = pickle.load(File)
-        print(newval)
-
-    File.close()
+
+    with open("studrec.dat", "rb+") as File:
+        value = pickle.load(File)
+        found = False
+        roll = int(input("Enter the roll number of the record"))
+        
+        for i in value:
+            if roll == i[0]:
+                print(f"current name {i[1]}")
+                print(f"current marks {i[2]}")
+                i[1] = input("Enter the new name")
+                i[2] = int(input("Enter the new marks"))
+                found = True
+
+        if not found:
+            print("Record not found")
+
+        else:
+            pickle.dump(value, File)
+            File.seek(0)
+            print(pickle.load(File))
 
 
 update()

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

@@ -12,7 +12,6 @@
 
 import pickle
 
-F = open("class.dat", "ab")
 list = [
     [1, "Ramya", 30],
     [2, "vaishnavi", 60],
@@ -24,54 +23,46 @@
     [8, "sandhya", 65],
 ]
 
-
-pickle.dump(list, F)
-F.close()
+with open("class.dat", "ab") as F:
+    pickle.dump(list, F)
+    F.close()
 
 
 def remcount():
-    F = open("class.dat", "rb")
-    val = pickle.load(F)
-    count = 0
+    with open("class.dat", "rb") as F:
+        val = pickle.load(F)
+        count = 0
 
-    for i in val:
-        if i[2] <= 40:
-            print(i, "eligible for remedial")
-            count += 1
-    print("the total number of students are", count)
-    F.close()
+        for i in val:
+            if i[2] <= 40:
+                print(f"{i} eligible for remedial")
+                count += 1
+        print(f"the total number of students are {count}")
 
 
 remcount()
 
 
 def firstmark():
-    F = open("class.dat", "rb")
-    val = pickle.load(F)
-    main = []
-    count = 0
-
-    for i in val:
-        data = i[2]
-        main.append(data)
+    with open("class.dat", "rb") as F:
+        val = pickle.load(F)
+        count = 0
+        main = [i[2] for i in val]
 
-    top = max(main)
-    print(top, "is the first mark")
+        top = max(main)
+        print(top, "is the first mark")
 
-    F.seek(0)
-    for i in val:
-        if top == i[2]:
-            print(i)
-            print("congrats")
-            count += 1
+        F.seek(0)
+        for i in val:
+            if top == i[2]:
+                print(f"{i}\ncongrats")
+                count += 1
 
-    print("the total number of students who secured top marks are", count)
-    F.close()
+        print("the total number of students who secured top marks are", count)
 
 
 firstmark()
 
-F = open("class.dat", "rb")
-val = pickle.load(F)
-print(val)
-F.close()
+with open("class.dat", "rb") as F:
+    val = pickle.load(F)
+    print(val)

1 File handle/File handle binary/search record in binary file.py

@@ -4,21 +4,18 @@
 
 
 def binary_search():
-    F = open("studrec.dat", "rb")
-    # your file path will be different
-    value = pickle.load(F)
-    search = 0
-    rno = int(input("Enter the roll number of the student"))
+    with open("studrec.dat", "rb") as F:
+        # your file path will be different
+        search = 0
+        rno = int(input("Enter the roll number of the student"))
 
-    for i in value:
-        if i[0] == rno:
-            print("Record found successfully")
-            print(i)
-            search = 1
+        for i in pickle.load(F):
+            if i[0] == rno:
+                print(f"Record found successfully\n{i}")
+                search = 1
 
-    if search == 0:
-        print("Sorry! record not found")
-    F.close()
+        if search == 0:
+            print("Sorry! record not found")
 
 
 binary_search()

1 File handle/File handle text/counter.py

@@ -0,0 +1,35 @@
+"""
+    Class resposible for counting words for different files:
+    - Reduce redundant code
+    - Easier code management/debugging
+    - Code readability
+"""
+
+class Counter:
+
+    def __init__(self, text:str) -> None:
+        self.text = text
+
+        # Define the initial count of the lower and upper case.
+        self.count_lower = 0
+        self.count_upper = 0
+        self.count()
+
+    def count(self) -> None:
+        
+        for char in self.text:
+            if char.lower():
+                self.count_lower += 1
+            elif char.upper():
+                self.count_upper += 1
+
+        return (self.count_lower, self.count_upper)
+    
+    def get_total_lower(self) -> int:
+        return self.count_lower
+
+    def get_total_upper(self) -> int:
+        return self.count_upper
+
+    def get_total(self) -> int:
+        return self.count_lower + self.count_upper

1 File handle/File handle text/file handle 12 length of line in text file.py

@@ -9,28 +9,28 @@ def write_to_file(file_name):
 
     if os.path.exists(file_name):
         print(f"Error: {file_name} already exists.")
+        return
 
-    else:
-        with open(file_name, "a") as F:
-            while True:
-                text = input("enter any text to add in the file:- ")
-                F.write(
-                    text + "\n"
-                )  # write function takes exactly 1 arguement so concatenation
-                choice = input("Do you want to enter more, y/n")
-                if choice == "n":
-                    break
-        
+    with open(file_name, "a") as F:
+
+        while True:
+            text = input("enter any text to add in the file:- ")
+            F.write( f"{text}\n" )
+            choice = input("Do you want to enter more, y/n").lower()
+            if choice == "n":
+                break
+    
 def longlines():
+
     with open(file_name, encoding='utf-8') as F:
         lines = F.readlines()
+        lines_less_than_50 = list( filter(lambda line: len(line) < 50, lines ) )
 
-        for i in lines:
-            if len(i) < 50:
+        if not lines_less_than_50:
+            print("There is no line which is less than 50")
+        else:
+            for i in lines_less_than_50:
                 print(i, end="\t")
-            else: 
-                print("There is no line which is less than 50 ")
-
 
 if __name__ == "__main__":
     write_to_file(file_name)

1 File handle/File handle text/question 2.py

@@ -8,17 +8,15 @@
 
 def display_words(file_path):
 
-
     try:
-        with open(file_path, 'r') as F:
-            lines = F.read()
-            words = lines.split()
-            count = 0
-            for word in words:
-                if (len(word) < 4):
-                    print(word)
-                    count += 1
-        return "The total number of the word's count which has less than 4 characters", (count) 
+        with open(file_path) as F:
+            words = F.read().split()
+            words_less_than_40 = list( filter(lambda word: len(word) < 4, words) )
+
+            for word in words_less_than_40:
+                print(word)
+        
+        return "The total number of the word's count which has less than 4 characters", (len(words_less_than_40)) 
 
     except FileNotFoundError:
         print("File not found")

1 File handle/File handle text/question 5.py

@@ -1,8 +1,8 @@
 """Write a function in python to count the number of lowercase
 alphabets present in a text file “happy.txt"""
 
-import time
-import os
+import time, os
+from counter import Counter
 
 print("You will see the count of lowercase, uppercase and total count of alphabets in provided file..")
 
@@ -16,30 +16,15 @@
 def lowercase(file_path):
     try:
 
-        with open(file_path, 'r') as F:
-            # Define the initial count of the lower and upper case.
-            lowercase_count = 0
-            uppercase_count = 0
-
-            value = F.read()
-
-            for i in value:
-                if i.islower():
-                    # It will increase the count.
-                    lowercase_count += 1
-                elif i.isupper():
-                    uppercase_count += 1
-            
-
-
-            total_count = lowercase_count+uppercase_count
+        with open(file_path) as F:
+            word_counter = Counter(F.read())
 
-            print("The total number of lower case letters are", lowercase_count)
-            time.sleep(1)
-            print("The total number of upper case letters are", uppercase_count)
-            time.sleep(1)
-            print("The total number of letters are", total_count)
-            time.sleep(1)
+            print(f"The total number of lower case letters are {word_counter.get_total_lower()}")
+            time.sleep(0.5)
+            print(f"The total number of upper case letters are {word_counter.get_total_upper()}")
+            time.sleep(0.5)
+            print(f"The total number of letters are {word_counter.get_total()}")
+            time.sleep(0.5)
 
     except FileNotFoundError:
         print("File is not exist.. Please check AGAIN")