Hi,
I am quite new to Python, and the following puzzles me, maybe there is someone here who can tell me what is wrong?
I have a list of words in a plain textfile (encoded in latin-1). There is one word per line, and 106299 words in total. I want to load the words to a list because I want to manipulate them, and then write them to a different file...
The mystery for me is that the new file only contains 106211 lines, even though I have not done anything with the list yet, and the last line contains a word that has been truncated.
I have tried many different version of the program, but this is the most basic one, and it gives the error mentioned above: -
f = open("list.txt", "r")
-
wordlist = [w.lower() for w in f.readlines()]
-
f.close
-
-
f = open("new_list.txt", "w")
-
f.writelines(wordlist)
-
f.close
-
I am running this from Windows XP in Python 2.5.1, using IDLE.
4  1561 
An update: I was just told that IDLE is basically "useless" by a fellow programmer, so I tried running the script directly from the terminal instead of using IDLE. So this seems to be just an IDLE bug? (Sorry for not realizing that the results would differ, I thought IDLE used the same python as the terminal.)
bvdet 2,851
Recognized Expert Moderator Specialist
An update: I was just told that IDLE is basically "useless" by a fellow programmer, so I tried running the script directly from the terminal instead of using IDLE. So this seems to be just an IDLE bug? (Sorry for not realizing that the results would differ, I thought IDLE used the same python as the terminal.)
The problem is not with IDLE. You did not close the file. You must include ' ()' when closing the file. - f = open('file_name')
-
f.close()
The data is flushed through the buffer when the file is close. All the data was not written in your case.
Oh, thank you for that information. I also tried changing the buffering mode to none, which made it work in IDLE, so your explanation makes much sense. So I understand that you should always close a file after writing to it, but it is not necessary when reading from it?
bvdet 2,851
Recognized Expert Moderator Specialist
Oh, thank you for that information. I also tried changing the buffering mode to none, which made it work in IDLE, so your explanation makes much sense. So I understand that you should always close a file after writing to it, but it is not necessary when reading from it?
It is always a good idea to close every file that you open. Python takes care of garbage collection, so it is not a critical issue when reading the contents of a file as in: - data = open('file_name').read()
In this case, no file object is created.
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