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Appending a line to a file only if it does not already exist
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Add -s to ignore errors when the file does not exist, creating a new file with just that line.
– Frank
Mar 21 '18 at 18:09
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Install tkinter for Python
I am trying to import Tkinter . However, I get an error stating that Tkinter has not been installed:
20 Answers
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Rails 4 multiple image or file upload using carrierwave
... from saving. Instead the post is saved, and then the ActiveRecord invalid error is thrown for the attachment model only. I think this is because of the create! method. but using create instead just fails silently. Any idea how to have the validation happen on the post reach into the attachments?
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Get MIME type from filename extension
...the future since it's not an agreed upon contract and you'll get a runtime error instead of a compile-time error if that happens. If you are going to do this, you should at least add unit tests for it to be sure to catch it early when upgrading .NET versions. Besides that, if you're going to add m...
How can I get a file's size in C++? [duplicate]
...;fstream> and <iostream>, you do need <string> and you need error checking. (fseek segfaults when using a NULL file, ftell returns -1 on error)
– rve
Apr 30 '11 at 16:48
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Determine Whether Integer Is Between Two Other Integers?
...e(1,4) is False. So better use the 1 >= r <= 4 as it avoids possible errors by newcomers
– tripplet
Jun 26 '14 at 8:01
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Can the Unix list command 'ls' output numerical chmod permissions?
...get the file permission information. Calculating it by hand will lead to errors!
– Evan Langlois
Nov 9 '15 at 6:28
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sql server invalid object name - but tables are listed in SSMS tables list
...data cached by Intellisense to provide typeahead support and pre-execution error detection.
NOTE: Your cursor must be in the query editor for the IntelliSense menu to be visible.
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How can I remove an element from a list?
...it documentation for R on how to remove elements from lists, but trial and error tells me
myList[[5]] <- NULL
will remove the 5th element and then "close up" the hole caused by deletion of that element. That suffles the index values, So I have to be careful in dropping elements. I must ...
Django TemplateDoesNotExist?
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I had an embarrassing problem...
I got this error because I was rushing and forgot to put the app in INSTALLED_APPS. You would think Django would raise a more descriptive error.
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