identifier

Let's say I have the following data frame: a <- runif(10) dd <- as.data.frame(t(a)) names(dd) <- c("ID", "a", "a2", "b", "b2", "f", "XXX", "1", "4", "8") In dplyr , there is a nice way to select a number of columns. For example, to select the columns between column a and column f , I can use dd %>% dplyr::select(a:f) In my problem, the columns of the last part of the data frame may vary, yet they always have as name a number between 1 and 99. However, I can not seem to be able to do the same trick as above: > dd %>% select(1:99) Error: Position must be between 0 and n > dd %>% select("1":"99")

This question already has an answer here: Unique and temporary file names in PHP? 9 answers Can any one suggest the best practice to generate unique file names for file uploads to avoid duplicate Entries? Thanks In Advance. I usually either create a UID using uniqid() function for the filename or create a folder with the name of the username who is uploading the file and leave the original filename. The disadvantage of the first one is that you will have to save the original filename somewhere to show to the user. This function may help: http://php.net/manual/en/function.uniqid.php You may

My web app is using multiple OAuth 2.0 Identity Providers, and would like to retrieve the ' sub ' from the id_token of the Access Token Response and match it with one stored in my app's DB, since ' sub ' is an unique id across whatever system the user is at, and it's a stand field in the id_token. My question is: Is there an obvious/convenient way to retrieve a user's Token Subject Identifier (aka sub ) from within Azure AD portal? I know ' Object ID ' (aka Object Identifier or oid ) is part of the user profile at the Azure AD portal. However, ' oid ' is not a standard field in the JWT id

I have a python specific question. What does a single underscore _ as a parameter means? I have a function calling hexdump(_) . The _ was never defined, so I guess it has some special value, I could not find a reference telling me what it means on the net. I would be happy if you could tell me. In Python shells, the underscore ( _ ) means the result of the last evaluated expression in the shell: >>> 2+3 5 >>> _ 5 There's also _2 , _3 and so on in IPython but not in the original Python interpreter. It has no special meaning in Python source code as far as I know, so I guess it is defined

I'm having a problem with bundle identifiers. In the Summary section of my project in Xcode and under 'Identifiers', I can't seem to change the name of my bundle ID as it is greyed out. For example, my project name is 'My App'. In the identifier text box in Summary, it says this 'My-App' and is greyed out. However, my bundle id in my provisioning profile is this, 'com.mycompany.myapp'. I would like to change my bundle ID in my project to that but I can't seem to be able to. Any ideas why it is greyed out? Thanks! Not sure why this is happening to you, but try to change in the info.plist file.

Does anyone know if there is any builtin python method that will check if something is a valid python variable name, INCLUDING a check against reserved keywords? (so, ie, something like 'in' or 'for' would fail...) Failing that, does anyone know of where I can get a list of reserved keywords (ie, dyanamically, from within python, as opposed to copy-and-pasting something from the online docs)? Or, have another good way of writing your own check? Surprisingly, testing by wrapping a setattr in try/except doesn't work, as something like this: setattr(myObj, 'My Sweet Name!', 23) ...actually works!