seek() and tell() in python
Data file handling Within a file, we can get the current position of cursor and move the cursor. To do this python gives us two functions, tell()and seek().
Highlights
- tell() method
- seek() method
- Example Program
tell() method
This function returns an integer that specifies the current position of the file object in the file. The position so specified is the byte position from the beginning of the file till the current position of the file object.
The syntax of using tell() is: file_object.tell()
seek() method
This method is used to position the file object at a particular position in a file. The syntax of seek() is:
file_object.seek(offset [, reference_point]) In the above syntax, offset is the number of bytes by which the file object is to be moved. reference point indicates the starting position of the file object. That is, with reference to which position, the offset has to be counted. It can have any of the following values:
- 0 - beginning of the file
- 1 - current position of the file
- 2 - end of file
By default, the value of reference_point is 0, i.e. the offset is counted from the beginning of the file. For example, the statement fileObject.seek(5,0) will position the file object at 5th byte position from the beginning of the file. The code in Program 2-2 below demonstrates the usage of seek() and tell().
offset - Required parameter. Sets the cursor to the specified position and starts reading after that position. whence - Optional parameter. It is used to set the point of reference to start from which place.
Application of seek() and tell()
print("Learning to move the file object")
fileobject=open("testfile.txt","r+")
str=fileobject.read()
print(str)
print("Initially, the position of the file object is: ",fileobject.
tell())
fileobject.seek(0)
print("Now the file object is at the beginning of the file:
",fileobject.tell())
fileobject.seek(10)
print("We are moving to 10th byte position from the beginning of
file")
print("The position of the file object is at", fileobject.tell())
str=fileobject.read()
print(str)
Output of Program 2-2:
>>>
RESTART:
Path_to_file\Program2-2.py
Learning to move the file object
roll_numbers = [1, 2, 3, 4, 5, 6]
Initially, the position of the file object is: 33
Now the file object is at the beginning of the file: 0
We are moving to 10th byte position from the beginning of
file
The position of the file object is at 10
numbers = [1, 2, 3, 4, 5, 6]
Example 2:
fh = open ("text.txt", "r+")
print ("Name of the file: ", fh.name)
line_1 = fh.readline()
print ("Read Line: %s" % (line_1))
# Again, set the pointer to the beginning
fh.seek (0, 1)
line_2 = fh.readline()
print ("Read Line: %s" % (line_2))
# Close opend file
fh.close()
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