Why do I get “Pickle – EOFError: Ran out of input” reading an empty file?
I would check that the file is not empty first: Also open(target, ‘a’).close() is doing nothing in your code and you don’t need to use ;.
c++ compile error: ISO C++ forbids comparison between pointer and integer
You have two ways to fix this. The preferred way is to use: (instead of char). The other possible way to fix it is: (note single quotes instead of double, representing a char constant).
How do I generate random integers within a specific range in Java?
How do I generate a random int value in a specific range? I have tried the following, but those do not work: Attempt 1: Bug: randomNum can be bigger than maximum. Attempt 2: Bug: randomNum can be smaller than minimum.
error: ‘Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (2)’ — Missing /var/run/mysqld/mysqld.sock
To find all socket files on your system run: My Mysql server system had the socket open at /var/lib/mysql/mysql.sock Once you find where the socket is being opened, add or edit the line to your /etc/my.cnf file with the path to the socket file: Sometimes the system startup script that launched the command line executable specifies … Read more
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
Why does git say “Pull is not possible because you have unmerged files”?
What is currently happening is, that you have a certain set of files, which you have tried merging earlier, but they threw up merge conflicts. Ideally, if one gets a merge conflict, he should resolve them manually, and commit the changes using git add file.name && git commit -m “removed merge conflicts”. Now, another user has … 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 in JSON at position 0
Try this in the console: Here is what you will get: In other words, your app is attempting to parse undefined, which is not valid JSON. There are two common causes for this. The first is that you may be referencing a non-existent property (or even a non-existent variable if not in strict mode). The second … Read more