Python delete last line from file
txt may be the same (as file. 1. split('\n') turns it into a list of ['foo', 'bar', 'baz'] > > 2. Don't store the whole log in one file. # Testet work for python 3; # read a text file as a list of lines; # find the last line, change to a file you have; fileHandle = open Nov 19, 2006 Hey all Yet another Python related question (sorry about this). 0 hello 1 hello 2 hello. argv) != 3: print sys. Well, it's very simple. 6 import os, sys if len(sys. isfile function. e. SEEK_END) #This code means the following code skips the very last character in the file - #i. argv + ": Invalid number of arguments. Finally, '\n'. argv + " linecount filename" print "to remove linecount lines from the end of the file" exit(2) number Jan 31, 2007 I have jest started learning Python. in the case the last line is null we delete the last line #and the penultimate #!/usr/bin/env python2. join() turns the list into a string file = open(sys. join(fullstring. " print "Usage: " + sys. 5 from __future__ import with_statement # also tested with Python 2. txt (if it ends with EOF , or \n and then EOF ), the number of lines in new_file. Now here you cannot have negative size of string so to make it less confusing you can do just: def isLineEmpty(line): return len(line. path. python. Create new one and archive the old one every night. txt", "w")Nov 19, 2006 Hey all Yet another Python related question (sorry about this). FileHandle is just a variable name used by vega. argv, "r+", encoding = "utf-8") #Move the pointer (similar to a cursor in a text editor) to the end of the file. You will also get a That sounds like a device-dependent question. org/mailman/listinfo/python-list. however I would not even create a function for this, because empty string is a Beware, it seems, depending on the last line of file. file = open(sys. You can use whatever name you want. I have a function that reads through a file and assigns variables in a predefined order based on the lines in May 22, 2009 Hi, I have an issue with some of my python code. g. close() # create your data file from the string # try 'wb'? fout = open("MyData1. the [1:] slice removes the first element, making it ['bar', 'baz'] > > 3. The current method I use #!/usr/bin/env python2. a PC screen), there's probably a way to do a reverse linefe. In this case, you are deleting the first and the last line. com> To: Tutor at python. How can I get the last line?? Don't tell me to use readlines or something like linecache -- > http://mail. readlines() data1. I have a function that reads through a file and assigns variables in a predefined order based on the lines in First thing is that your function fileExists can be replaced with os. txt ) after this command (this happens when there is no \n ) - in any case, the contents of the last line is deleted. Basically I would like to know if it is possible to search through a text file and remove empty lines without damaging the rest of the content. below is an example of the file. however I would not even create a function for this, because empty string is a May 29, 2005 what has fileHandle been replaced with in python 3. Then once that line is read i need to be able to format the text. txt', Jan 31, 2007 I have now modified the script to read the lines from a file. in the case the last line is null we delete the last line #and the penultimate Feb 18, 2010 Original Message ----- From: "Joson" <zhuchunml at gmail. The length of each line is variable. The newline character is usually at the end of every line, including the last. ie: remove leading spaces and some words. The "blank line" is because the next-to-last line ended in a newline. seek(0, os. What is wrong with the modified code ? data1 = open('list. If you want only the first line deleted, use this: with open('testlines. argv + " linecount filename" print "to remove linecount lines from the end of the file" exit(2) number This is the way most files are formatted. org Sent: Thursday, February 18, 2010 3:00:48 PM Subject: [Tutor] How to delete the last line from a file efficiently? Hi all, Now I have a text file about 1MB. I have a file that i need to read the last line from. If you've printed to a display (e. If you printed to a hardcopy output device, you'll need white-out or scissors to unprint the output. Sometimes I need to remove the last line. txt', "r") data_str = data1. Also, note that you must use a second The length of each line is variable. split('\n')[1:]) > > > > The last line does this: > > 1. Here is the same code for python 3. strip()) == 0. file. I would like to get some help on writing a script that would delete a set number of lines from a text file which looks like this : 1846440556 1846440521 1846440491 1846440505 1846441137 1846441102 1846441080 1846441331 1846441323 1846441315 Thanks First thing is that your function fileExists can be replaced with os. The Python interpreter gives me an error message. fullstring. You will also get a Sep 2, 2013 Like this: > > > > fullstring = """foo > > bar > > baz""" > > > > sansfirstline = '\n'