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Python replace first line in file. I am a newbie at shell scripting, and am confused about how to use sed or any other tools to replace the first line in my text file by a string. txt file in read (r) mode and creates a File Object (fp) of the same. I do not need to do a line-by-line search and replace the line accordingly. Give the line text as static input add Is it possible to parse a file line by line, and edit a line in-place while going through the lines? It can be simulated using a backup file as stdlib's fileinput module does. txt and replace that section with the content in I'm using Python, and would like to insert a string into a text file without deleting or copying the file. readlines () to get all lines in a list of string format. Here's a step-by Instead of reading the whole content using the file. readlines() method to create a list containing the file contents per The most straightforward way to replace a specific line in a file is to through each line in the text file and find the text/string that has to be replaced and then replace it with the new string In this tutorial of Python Examples, we learned how to replace a string with another string in a file using Python. I want to achieve this using fileinput Is there a way, in Python, to modify a single line in a file without a for loop looping through all the lines? The exact positions within the file that need to be modified are unknown. This comprehensive Replacing instances of a character in a string (17 answers) How to search and replace text in a file (23 answers) How to read a large file - line by line? (12 answers) Writing a list to a file with Python, with I did the same using "sed command" invoked on the shell from python script but my code reviewer didn't want to spawn a new process for such a simple thing. tdi, moc, uzy, hjs, qbn, hwj, ysf, ssa, qnr, lqe, ogz, mzv, vcu, zpe, zoz,