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I have a program which writes a user's highscore to a text file. The file is named by the user when they choose a playername.
If the file with that specific username already exists, then the program should append to the file (so that you can see more than one highscore). And if a file with that username doesn't exist (for example, if the user is new), it should create a new file and write to it.
Here's the relevant, so far not working, code:
try: with open(player): #player is the varible storing the username input with open(player, 'a') as highscore: highscore.write("Username:", player) except IOError: with open(player + ".txt", 'w') as highscore: highscore.write("Username:", player) The above code creates a new file if it doesn't exist, and writes to it. If it exists, nothing has been appended when I check the file, and I get no errors.
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If file does not exist, it creates a new file. This is the default mode. It opens in text mode. This opens in binary mode.
Append mode adds information to an existing file, placing the pointer at the end. If a file does not exist, append mode creates the file. Note: The key difference between write and append modes is that append does not clear a file's contents. Add the + sign to include the read functionality.
When you open a file for writing, if the file does not exist, a new file is created. When you open a file for writing, if the file exists, the existing file is overwritten with the new file.
The difference between appending and writing is that when you write to a file, you erase whatever was previously there whereas when you append to a file, you simply add the new information to the end of whatever text was already there.
Have you tried mode 'a+'?
with open(filename, 'a+') as f: f.write(...) Note however that f.tell() will return 0 in Python 2.x. See https://bugs.python.org/issue22651 for details.
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