modified file_handling

file_handling.py

@@ -1,7 +1,20 @@
 from os import read
+import os
+
+### checkout python docs for more https://docs.python.org/3/library/filesys.html
+### file = open('filename' , 'mode')
+""" 
+ modes = r (read only)
+         r+ (read and write)
+         w (write)  ## the W mode overwrites the entire file.....so beware 
+         a (append)  ## append mode appends text at the end of file
+         x (create)
+         t (text)
+         b (binary)
+"""
 
 # file reading 
-file = open('trial.txt' , 'r')
+file = open('trial.txt' , 'r+')
 
 for each in file:
     print(each)
@@ -10,14 +23,45 @@
 
 # file writing 
 
-file.write("this is the write function")
-file.write("this lets us write to the file")
+file.write("this is the write function\n")
+file.write("this lets us write to the file\n")
 file.close   # the close function lets us close all the resources in use
 
 
 ## Append mode 
 
 file = open('trial.txt','a')
 
-file.write("writing this in append mode")
+file.write("writing this in append mode\n")
 file.close
+
+## using write with with()
+
+with open('trial.txt','r+') as file:
+    text = file.read()
+    file.write("writing from within with()\n")
+
+## creating a file using x mode
+
+file2 = open('newfile','x') ## creates the file ...returns error if the file already exists
+os.remove("newfile")   ## this removes the file
+
+## readline()
+
+file3 =  open('trial.txt')
+print(file3.readline())
+print(file3.readline())    ## this would print the first two lines of the file
+
+## create a file , add a line and a string , read them , split the string and store it in a list , delete the file by checking if it exists atfirst
+
+file4 = open("myfile","x")
+file4 = open("myfile","r+")
+file4.write("this is the line\n")
+file4.write("apple , banana , cherry , mango")
+content = file4.read()
+print(content)  #TODO debug here...
+
+if os.path.exists("myfile"):
+    os.remove("myfile")
+else:
+    print("the file doesnt exist\n")

trial.txt

@@ -1,2 +1,3 @@
 helloo brooo
 this is just a simple text file for testing purposes
+