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How can I read large text files in Python, line by line, without loading it into memory?
I need to read a large file, line by line. Lets say that file has more than 5GB and I need to read each line, but obviously I do not want to use readlines() because it will create a very large list in the memory.
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Volatile vs. Interlocked vs. lock
Let's say that a class has a public int counter field that is accessed by multiple threads. This int is only incremented or decremented.
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Prototypical inheritance - writing up [duplicate]
...s is called the prototype chain. The prototype part of inheritance is done by lengthening this chain; for example bob => Employee.prototype => Person.prototype => Object.prototype (more on inheritance later).
Even though bob, ben and all other created Person instances share walk the functi...
Python Pandas Error tokenizing data
...e the offending file and to correct the bad lines so that they can be read by read_csv. @PetraBarus, why not just add columns to the CSV files that are missing them (with null values as needed)?
– dbliss
Oct 6 '14 at 22:57
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PHP Pass variable to next page
... variables. Sessions and cookies are quite easy to use, with session being by far more secure than cookies. More secure, but not completely secure.
Session:
//On page 1
$_SESSION['varname'] = $var_value;
//On page 2
$var_value = $_SESSION['varname'];
Remember to run the session_start(); stateme...
Why does Javascript's regex.exec() not always return the same value? [duplicate]
...dvantage of the fact that exec returns null when there are no more matches by performing the assignment as the loop condition.
var re = /foo_(\d+)/g,
str = "text foo_123 more text foo_456 foo_789 end text",
match,
results = [];
while (match = re.exec(str))
results.push(+match[1]);
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Officially, what is typename for?
On occasion I've seen some really indecipherable error messages spit out by gcc when using templates... Specifically, I've had problems where seemingly correct declarations were causing very strange compile errors that magically went away by prefixing the typename keyword to the beginning of the...
Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?
...not imply that using the same format specifier means that the data written by a [f]printf() can be read by [f]scanf(). In general, using the same format specifier for scanf() that was used by printf() will not successfully read the data. For example, space padding that can be inserted by a prinf()...
What is aria-label and how should I use it?
...Vox would be a good place to start? I've never used it though. They work by reading the screen aloud to the user, taking cues from the HTML (e.g. an h1 should be emphasised more than a p, a is clearly a link, form` indicates somewhere to enter information, aria-* attributes give further clues to ...
MVC Vs n-tier architecture
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N-tier architecture usually has each layer separated by the network. I.E. the presentation layer is on some web servers, then that talks to backend app servers over the network for business logic, then that talks to a database server, again over the network, and maybe the app ...