Python Crash Course: A Beginner’s Guide to Master the Basics of Python and Data Science. Learn Coding with This Machine Learning Tool. Discover the Endless Possibilities of Computers and Codes. by Wall Eric

Author:Wall, Eric [Wall, Eric]
Language: eng
Format: epub, azw3, pdf
Published: 2020-09-27T16:00:00+00:00

Note that we had instructed the method to read only 10 bytes from the file, and that is why not all the file contents were read.

File Positions

You may use the tell() method to tell the current position in a file. This tells where the next read or write will start from the next time you attempt to do so on the file.

If you need to change this position, you can use the seek(offset[, from]) method. The argument is that offset specifies the number of bytes that should be moved. The argument from specifies the reference position from which bytes should be moved.

If the value of from is 0, then the reference position is the starting point of the file. If you set it to 1, then the current position will be used as a reference position. If it is set to 2, the file’s end will be used as a reference position.

Example

#!/usr/bin/Python3

# Openig the file

p = open("friends.txt", "r+")

str = p.read(10)

print ("The function read the string : ", str)

# Checking the current position

pos = p.tell()

print ("The current position for the file is : ", pos)

# Reposition the pointer to the beginning

pos = p.seek(0, 0)

str = p.read(10)

print ("The read String again is : ", str)

# Close the opened file

p.close()

Run the code from the directory you have stored the file names.txt in. In my case, it returns the following:

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