Merge pull request #1393 from Biancaa-R/master

Python(basic,file handling)

Author: geekcomputers

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

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+import pickle
+def Bdelete():
+    F= open("studrec.dat","rb")
+    stud = pickle.load(F)
+    F.close()
+    print(stud)
+    rno= int(input("Enter the roll number 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()
+Bdelete()

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

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+import pickle
+
+def binaryread():
+    B=open("studrec.dat","rb")
+    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")
+    
+        B.close
+
+binaryread()

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

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+#Updating records in a binary file
+
+import pickle
+
+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
+
+    if found==0:
+        print("Record not found")
+
+    else:
+       F.seek(0)
+       pickle.dump(S,F)
+
+    F.close()    
+
+update()
+
+F=open("class.dat","rb")
+val=pickle.load(F)
+print(val)
+F.close()

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

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+#updating records in a bnary file
+
+import pickle
+
+def update():
+    F=open("studrec.dat","rb+")
+    value=pickle.load(F)
+    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,F)
+        F.seek(0)
+        newval=pickle.load(F)
+        print(newval)
+        
+    F.close()
+update()
+
+    

1 File handle/File handle binary/class.dat

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+'''Amit is a monitor of class XII-A and he stored the record of all
+the students of his class in a file named “class.dat”.
+Structure of record is [roll number, name, percentage]. His computer
+teacher has assigned the following duty to Amit
+
+Write a function remcount( ) to count the number of students who need
+ remedial class (student who scored less than 40 percent)
+
+ 
+ '''
+#also find no. of children who got top marks
+
+import pickle
+F=open("class.dat",'ab')
+list=[[1,"Ramya",30],[2,"vaishnavi",60],[3,"anuya",40],[4,"kamala",30],[5,"anuraag",10],[6,"Reshi",77],[7,"Biancaa.R",100],[8,"sandhya",65]]
+
+
+pickle.dump(list,F)
+F.close()
+
+def remcount():
+    F=open("class.dat","rb")
+    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()
+
+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)
+        
+    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
+        
+    
+    print("the total number of students who secured top marks are",count)
+    F.close()
+firstmark()
+
+F=open("class.dat","rb")
+val=pickle.load(F)
+print(val)
+F.close()
+
+
+  

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

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+#binary file to search a given record
+
+import pickle
+
+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"))
+
+    for i in value:
+        if i[0]== rno:
+            print("Record found successfully")
+            print(i)
+            search=1
+
+    if search==0:
+        print("Sorry! record not found")
+    F.close()
+
+binary_search()    

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

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+def longlines():
+    F=open("story.txt","r")
+    line=F.readlines()
+
+    for i in line:
+        if len(i)<50:
+            print(i,end="   ")
+            
+    F.close()
+longlines()     

1 File handle/File handle binary/studrec.dat

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+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
+Take a walk in the park
+In the end of the day you are more important than anything else.
+Many moments of happiness are waiting
+You are amazing!
+Its true believe.