First option: (Easiest, recommended) Open Notepad++. On the menu go to: Run -> Run.. (F5). Type in: Now, instead of pressing run, press save to create a shortcut for it. Notes If you have Python 3.1: type in Python31 instead of Python26 Add -i if you want the command line window to stay open after … Read more
Possible Duplicate:mysql_escape_string VS mysql_real_escape_string I need to get company_name (given by user through a form) entered into my mysql database. When I use I get an error But everything seems to fine while using What can I do in such cases?
There’s a function in the standard-library for this: itertools.permutations. If for some reason you want to implement it yourself or are just curious to know how it works, here’s one nice approach, taken from http://code.activestate.com/recipes/252178/: A couple of alternative approaches are listed in the documentation of itertools.permutations. Here’s one: And another, based on itertools.product:
A Runnable is basically a type of class (Runnable is an Interface) that can be put into a thread, describing what the thread is supposed to do. The Runnable Interface requires of the class to implement the method run() like so: And then use it like this: If you did not have the Runnable interface, … Read more
The evaluation of condition resulted in an NA. The if conditional must have either a TRUE or FALSE result. This can happen accidentally as the results of calculations: To test whether an object is missing use is.na(x) rather than x == NA. See also the related errors: Error in if/while (condition) { : argument is … Read more
In Python, strings are immutable, so you can’t change their characters in-place. You can, however, do the following: The reasons this works is that it’s a shortcut for: The above creates a new string with each iteration, and stores the reference to that new string in s2.
It is common for comparison functions to return 0 on “equals”, so that they can also return a negative number for “less than” and a positive number for “greater than”. strcmp() and memcmp() work like this. It is, however, idiomatic for zero to be false and nonzero to be true, because this is how the … Read more
A functional requirement describes what a software system should do, while non-functional requirements place constraints on how the system will do so. Let me elaborate. An example of a functional requirement would be: A system must send an email whenever a certain condition is met (e.g. an order is placed, a customer signs up, etc). … Read more
Go to URL in your browser: firefox – click on HTTPS certificate chain (the lock icon right next to URL address). Click “more info” > “security” > “show certificate” > “details” > “export..”. Pickup the name and choose file type example.cer chrome – click on site icon left to address in address bar, select “Certificate” … Read more
I saw a question the other day where someone inadvertently used an incomplete type by specifying something like The compiler knew that struct A was a struct, despite A being totally undefined, by virtue of the struct keyword. That was in C++, where such usage of struct is atypical (and, it turns out, can lead … Read more