Make a File Writable in Order to Add New Packages

Make a file writable in order to add new packages

Changing the security setting on the R folder to "full control" fixed this for me. See the third posting down at this link for step by step instructions: Unable to update R packages in default library on Windows 7

Unable to update R packages in default library on Windows 7

Usually you need administrator rights to change things in program files. Try running RGui as administrator.

Writing to a new file if it doesn't exist, and appending to a file if it does

It's not clear to me exactly where the high-score that you're interested in is stored, but the code below should be what you need to check if the file exists and append to it if desired. I prefer this method to the "try/except".

import os
player = 'bob'

filename = player+'.txt'

if os.path.exists(filename):
    append_write = 'a' # append if already exists
else:
    append_write = 'w' # make a new file if not

highscore = open(filename,append_write)
highscore.write("Username: " + player + '\n')
highscore.close()

How can I make directory writable?

chmod 777 <directory>

This will give you execute/read/write privileges. You can play with the numbers to finely tune your desired permissions.

Here is the wiki with great examples.

How to give Read/Write permissions to a Folder during installation using .NET

By default Users group doesn't have write access in per-machine locations like Program Files. This is a Windows standard which is not related to installations. However, during install you can set any permissions you want.

Windows Installer does support custom permissions, but Visual Studio doesn't offer a way for setting them. So the only solution in Visual Studio is a custom action.

Unfortunately Visual Studio doesn't support attached custom actions. So using XCACLS.EXE to set permissions would work only if you include it in your package (it will be installed on the target machine along with your files).

A cleaner, but more complex solution is to write a custom action yourself (using custom code) to set the permissions you want.

The fastest and cleanest solution would be to use a different setup authoring tool which offers more control over permissions.

Updating Anaconda fails: Environment Not Writable Error

start your command prompt with run as administrator

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