The readlines method doesn’t return an iterator in Python 3, it returns a list Help on built-in function readlines: readlines(…) Return a list of lines from the stream. To check, just call it from an interactive session – it will return a list, rather than an iterator: >>> type(f.readlines()) <class ‘list’> Dive into Python appears … Read more
You have to remember the position by calling file.tell() before the readline and then calling file.seek() to rewind. Something like: fp = open(‘myfile’) last_pos = fp.tell() line = fp.readline() while line != ”: if line == ‘SPECIAL’: fp.seek(last_pos) other_function(fp) break last_pos = fp.tell() line = fp.readline() I can’t recall if it is safe to call … Read more
The short version is: The efficient way to use readlines() is to not use it. Ever. I read some doc notes on readlines(), where people has claimed that this readlines() reads whole file content into memory and hence generally consumes more memory compared to readline() or read(). The documentation for readlines() explicitly guarantees that it … Read more
You can do this using list: new_list = list(fL) Be aware that any spaces in the line will be included in this list, to the best of my knowledge.
This should do what you want (file contents in a list, by line, without \n) with open(filename) as f: mylist = f.read().splitlines()
You can read the whole file and split lines using str.splitlines: temp = file.read().splitlines() Or you can strip the newline by hand: temp = [line[:-1] for line in file] Note: this last solution only works if the file ends with a newline, otherwise the last line will lose a character. This assumption is true in … Read more
This code will read the entire file into memory and remove all whitespace characters (newlines and spaces) from the end of each line: with open(filename) as file: lines = file.readlines() lines = [line.rstrip() for line in lines] If you’re working with a large file, then you should instead read and process it line-by-line: with open(filename) … Read more