A brief introduction to the use of the readline () method in Python

Source: Internet
Author: User
This article briefly introduces the use of the readline () method in Python. it is the basic knowledge of getting started with Python. For more information, see readline () method to read a whole line from the file. The linefeed at the end is kept in the string. If the size parameter is not negative, a maximum number of bytes, including the ending line breaks and incomplete rows, may be returned.

Returns an empty string immediately when EOF is encountered.

The syntax of the readline () method is as follows:

fileObject.readline( size );


  • Size -- the number of bytes that can be read from the file.

Return value

This method returns the rows read from the file.

The following example shows how to use the readline () method.

#!/usr/bin/python# Open a filefo = open("foo.txt", "rw+")print "Name of the file: ", fo.name# Assuming file has following 5 lines# This is 1st line# This is 2nd line# This is 3rd line# This is 4th line# This is 5th lineline = fo.readline()print "Read Line: %s" % (line)line = fo.readline(5)print "Read Line: %s" % (line)# Close opend filefo.close()

When we run the above program, it will produce the following results:

Name of the file: foo.txtRead Line: This is 1st lineRead Line: This

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