Python 3 - File writelines() Method


The method writelines() writes a sequence of strings to the file. The sequence can be any iterable object producing strings, typically a list of strings. There is no return value.


Following is the syntax for writelines() method −

fileObject.writelines( sequence )


sequence − This is the Sequence of the strings.

Return Value

This method does not return any value.


The following example shows the usage of writelines() method.

Assuming that 'foo.txt' file contains following text:
This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line


# Open a file in read/write mode
fo = open("abc.txt", "r+")
print ("Name of the file: ",

seq = ["This is 6th line\n", "This is 7th line"]
# Write sequence of lines at the end of the file., 2)
line = fo.writelines( seq )

# Now read complete file from beginning.,0)
   for index in range(7):
      line = next(fo)
      print ("Line No %d - %s" % (index, line))

# Close opened file


When we run the above program, it produces the following result −

Name of the file:  foo.txt

Line No 0 - This is 1st line
Line No 1 - This is 2nd line
Line No 2 - This is 3rd line
Line No 3 - This is 4th line
Line No 4 - This is 5th line
Line No 5 - This is 6th line
Line No 6 - This is 7th line