Added better file handling and fixed some spelling/grammatical errors

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

@@ -1,24 +1,21 @@
 import pickle
 
 
-def Bdelete():
+def bdelete():
     # Opening a file & loading it
-    F = open("studrec.dat", "rb")
-    stud = pickle.load(F)
-    F.close()
-
-    print(stud)
+    with open("studrec.dat") as F:
+        stud = pickle.load(F)
+        print(stud)
 
     # Deleting the Roll no. entered by user
     rno = int(input("Enter the Roll no. to be deleted: "))
-    F = open("studrec.dat", "wb")
-    rec = []
-    for i in stud:
-        if i[0] == rno:
-            continue
-        rec.append(i)
-    pickle.dump(rec, F)
-    F.close()
+    with open("studrec.dat") as F:
+        rec = []
+        for i in stud:
+            if i[0] == rno:
+                continue
+            rec.append(i)
+        pickle.dump(rec, F)
 
 
-Bdelete()
+bdelete()

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

@@ -1,25 +1,23 @@
 import pickle
 
 
-def binaryread():
-    B = open("studrec.dat", "rb")
-    stud = pickle.load(B)
-    print(stud)
+def binary_read():
+    with open("studrec.dat") as b:
+        stud = pickle.load(b)
+        print(stud)
 
-    # prints the whole record in nested list format
-    print("contents of binary file")
+        # prints the whole record in nested list format
+        print("contents of binary file")
 
-    for ch in stud:
+        for ch in stud:
 
-        print(ch)  # prints one of the chosen rec in list
+            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]
+            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")
+            print(rno, rname, rmark, end="\t")
 
-        B.close
 
-
-binaryread()
+binary_read()

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

@@ -1,12 +1,10 @@
 def longlines():
-    F = open("story.txt", "r")
-    line = F.readlines()
+    with open('story.txt', encoding='utf-8') as F:
+        line = F.readlines()
 
-    for i in line:
-        if len(i) < 50:
-            print(i, end="   ")
-
-    F.close()
+        for i in line:
+            if len(i) < 50:
+                print(i, end="   ")
 
 
 longlines()

1 File handle/File handle text/happy.txt

@@ -2,10 +2,10 @@ hello how are you
 what is your name
 do not worry everything is alright
 everything will be alright
-please dont loose hope
-Wonders are in the way
+please don't lose hope
+Wonders are on the way
 Take a walk in the park
-In the end of the day you are more important than anything else.
+At the end of the day you are more important than anything else.
 Many moments of happiness are waiting
 You are amazing!
-Its true believe.
+If you truly believe.

1 File handle/File handle text/input,output and error streams.py

@@ -4,17 +4,13 @@
 sys.stdout.write("Enter the name of the file")
 file = sys.stdin.readline()
 
-F = open(file.strip(), "r")
+with open(file.strip(), ) as F:
+
+    while True:
+        ch = F.readlines()
+        for (i) in ch:  # ch is the whole file,for i in ch gives lines, for j in i gives letters,for j in i.split gives words
+            print(i, end="")
+        else:
+            sys.stderr.write("End of file reached")
+            break
 
-while True:
-    ch = F.readlines()
-    for (
-        i
-    ) in (
-        ch()
-    ):  # ch is the whole file,for i in ch gives lines, for j in i gives letters,for j in i.split gives words
-        print(i, end="")
-    else:
-        sys.stderr.write("End of file reached")
-        break
-F.close()

1 File handle/File handle text/story.txt

@@ -1,5 +1,5 @@
 once upon a time there was a king.
 he was powerful and happy.
 he had a garden.
-all the flowers in his garden was beautiful.
-he lived happily forever.
+all the flowers in his garden were beautiful.
+he lived happily ever after.