YouTipPython3 File seek() Method | Tutorial
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Python3.x Python3 File seek() Method
Overview
The seek() method is used to move the file read pointer to a specified position.
Syntax
The syntax for the seek() method is as follows:
fileObject.seek(offset[, whence])
Parameters
- offset -- The starting offset, which represents the number of bytes to move. If it is a negative number, it indicates starting from the nth byte from the end.
- whence: Optional, default value is 0. Defines a parameter for offset, indicating from which position to start the offset; 0 means from the beginning of the file, 1 means from the current position, and 2 means from the end of the file.
Return Value
If the operation is successful, it returns the new file position. If the operation fails, the function returns -1.
Example
The following example demonstrates the use of the seek() method:
Example
>>> f =open('workfile','rb+')
>>> f.write(b'0123456789abcdef')
16
>>> f.seek(5)# Move to the sixth byte of the file
5
>>> f.read(1)
b'5'
>>> f.seek(-3,2)# Move to the third byte from the end of the file
13
>>> f.read(1)
b'd'
The content of the file tutorial.txt is as follows:
1:www. 2:www. 3:www. 4:www. 5:www.
Loop to read the file content:
Example
#!/usr/bin/python3# Open the file fo = open("tutorial.txt", "r+")print("Filename: ", fo.name)line = fo.readline()print("Read data: %s" % (line))# Reset the file read pointer to the beginning fo.seek(0, 0)line = fo.readline()print("Read data: %s" % (line))# Close the file fo.close()
The output of the above example is:
Filename: tutorial.txt Read data: 1:www. Read data: 1:www.