import os

# change your parent dir accordingly

try:

parent_dir = "E:/GitHub/1) Git_Tutorials_Repo_Projects/core-python/Core_Python/ExFiles/"

fptr = open(os.path.join(parent_dir,"FilePointer.txt"),'w+')

print("Initial File Pointer : ",fptr.tell())

fptr.writelines(["<----This file is for file pointer example---->","\n<----After Writing the pointer change their position---->"])

print("After Writing content, File Pointer is at : ",fptr.tell())

''' So now we have to set pointer to zero by using seek'''

''' seek(offset,whence) : offset-> position to read/write

whence -> default 0 means absolute file positioning

1 means seek relative to current position

2 means seek relative to the file's end '''

fptr.seek(0,0)

print("Read file from beginning : ",fptr.read())

print("After Reading content, File Pointer is at : ",fptr.tell())

''' set position to first line '''

fptr.seek(47)

print("After Setting pointer to 47, File Pointer is at : ",fptr.tell())

fptr.seek(0,1)

print("After Setting offset to 0 and whence to 1, File Pointer is at : ",fptr.tell())

print("Read file from 47th to current position of file : ",fptr.read())

print("After Reading content, File Pointer is at : ",fptr.tell())

fptr.seek(47)

print("After Setting pointer to 47, File Pointer is at : ", fptr.tell())

fptr.seek(0, 2)

print("After Setting offset to 0 and whence to 2, File Pointer is at : ", fptr.tell())

''' Here we don't get data becasue whence = 2 set pointer to end of file '''

print("Read file from 106th to end position of file : ", fptr.read())

print("After Reading content, File Pointer is at : ", fptr.tell())

except (IOError,FileNotFoundError,Exception) as e:

print(e)