How to download a file over HTTP?

Use urllib.request.urlopen(): This is the most basic way to use the library, minus any error handling. You can also do more complex stuff such as changing headers. On Python 2, the method is in urllib2:

C++ error: terminate called after throwing an instance of ‘std::bad_alloc’

This code has 3 holes: First hole: int numEntries. Later you do: ++numEntries; You increment unspecified value. Not sure if it’s UB, but still bad. Second and third hole: And numEntries has unspecified value (first hole). You use it to initialize length and size – that is Undefined Behaviour. But let’s assume it is just some big number – you allocate memory … Read more

Using group by on multiple columns

Group By X means put all those with the same value for X in the one group. Group By X, Y means put all those with the same values for both X and Y in the one group. To illustrate using an example, let’s say we have the following table, to do with who is attending what subject at … Read more

C++ Vector of pointers

It means something like this: Then you add to the vector as you read lines: Remember to delete all of the Movie* objects once you are done with the vector.

uncaught syntaxerror unexpected token U JSON

I get this error “uncaught syntaxerror unexpected token U” when I run my page in chrome. And in firefox I get, “JSON.parse: unexpected character”. I’m returning the json data from a php file and the returning json string is valid. I checked it with http://jsonlint.com/ . Any help would be appreciated… Thanks. Here’s the returned JSON string

AttributeError: module ‘urllib3’ has no attribute ‘urlopen’ in python

If you want to send requests using urllib3, you need to create a pool manager first. Alternatively, you could use the HTTP client in the Python standard library. Its urlopen function is called urllib.request.urlopen. Depending on what you are trying to do, the requests package might also be an option, but it has certain disadvantages when it comes to certificate management for HTTPS URLs … Read more

How can you find out which process is listening on a TCP or UDP port on Windows?

New answer, powershell TCP UDP Old answer, cmd (Add -n to stop it trying to resolve hostnames, which will make it a lot faster.) Note Dane’s recommendation for TCPView. It looks very useful! -a Displays all connections and listening ports. -b Displays the executable involved in creating each connection or listening port. In some cases well-known executables host multiple independent … Read more

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