myfile.seek(0)

#opening the file in read ("r") mode
f = open("file.txt",'r')
#get all that is in the text file so far
oldString = f.readlines()
#and close it
f.close()
 
 
#delete it so we can reopen the file in write mode ('w')
del f
f=open("File.txt",'w')
 
#the string we are adding
newString = """
Hello
This will go
At the start"""
 
#writing the new string
 
for line in newString.split("\n"):
    f.write(line+'\n')
 
#writing the old string
for line in oldString:
    f.write(line+'\n')
 
#closing the file
 
f.close()

# exploring Python's file random access
 
text = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
 
fname = 'test103.txt'
 
# create a test file
fout  = open(fname, "w")
fout.write(text)
fout.close()
 
# open the test file for reading
fin = open(fname, "r")
 
# file positions are zero based
# tell the current file position
print( fin.tell() )   # 0
# read the byte at that position
print( fin.read(1) )  # A
# after reading 1 byte the position has advanced by 1
print( fin.tell() )   # 1
# read the next byte
print( fin.read(1) )  # B
print( fin.tell() )   # 2
 
# move the position to 10
fin.seek(10)
# read the byte at position 10
print( fin.read(1) )  # K
 
fin.close()