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Fastest way to count exact number of rows in a very large table?
I have come across articles that state that SELECT COUNT(*) FROM TABLE_NAME will be slow when the table has lots of rows and lots of columns.
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What is a .h.gch file?
...compiled header.
If a .gch is not found then the normal header files will be used.
However, if your project is set to generate pre-compiled headers it will make them if they don’t exist and use them in the next build.
Sometimes the *.h.gch will get corrupted or contain outdated information, so...
How do I get a class instance of generic type T?
...> . In a method of Foo , I want to get the class instance of type T , but I just can't call T.class .
21 Answers
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how to unit test file upload in django
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From Django docs on Client.post:
Submitting files is a special case. To POST a file, you need only
provide the file field name as a key, and a file handle to the file
you wish to upload as a value. For example:
c = Client()
with open('wishlist.doc') as f...
Expanding tuples into arguments
...tly what you request. The * operator simply unpacks the tuple (or any iterable) and passes them as the positional arguments to the function. Read more about unpacking arguments.
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Does Python have a string 'contains' substring method?
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You can use the in operator:
if "blah" not in somestring:
continue
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How can I write a heredoc to a file in Bash script?
How can I write a here document to a file in Bash script?
9 Answers
9
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Using the HTML5 “required” attribute for a group of checkboxes?
When using the newer browsers that support HTML5 (FireFox 4 for example);
and a form field has the attribute required='required' ;
and the form field is empty/blank;
and the submit button is clicked;
the browsers detects that the "required" field is empty and does not submit the form; ins...
When would you use the Builder Pattern? [closed]
What are some common , real world examples of using the Builder Pattern? What does it buy you? Why not just use a Factory Pattern?
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How do you specify a different port number in SQL Management Studio?
...5 server which is not on port 1433. How do I indicate a different port number when connecting to the server using SQL Management Studio?
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