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multiprocessing: sharing a large read-only object between processes?
...cture with lots of workers, do this.
Write each worker as a "filter" – reads intermediate results from stdin, does work, writes intermediate results on stdout.
Connect all the workers as a pipeline:
process1 <source | process2 | process3 | ... | processn >result
Each process reads, doe...
Purpose of memory alignment
...s of cache memory that data must be pulled through; supporting single-byte reads would make the memory subsystem throughput tightly bound to the execution unit throughput (aka cpu-bound); this is all reminiscent of how PIO mode was surpassed by DMA for many of the same reasons in hard drives.
The C...
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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Python Pandas Error tokenizing data
...
you could also try;
data = pd.read_csv('file1.csv', error_bad_lines=False)
Do note that this will cause the offending lines to be skipped.
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Read data from SqlDataReader
...
using(SqlDataReader rdr = cmd.ExecuteReader())
{
while (rdr.Read())
{
var myString = rdr.GetString(0); //The 0 stands for "the 0'th column", so the first column of the result.
// Do somthing with this rows string, ...
Why is iostream::eof inside a loop condition (i.e. `while (!stream.eof())`) considered wrong?
...
Because iostream::eof will only return true after reading the end of the stream. It does not indicate, that the next read will be the end of the stream.
Consider this (and assume then next read will be at the end of the stream):
while(!inStream.eof()){
int data;
// yay...
Why is reading lines from stdin much slower in C++ than Python?
I wanted to compare reading lines of string input from stdin using Python and C++ and was shocked to see my C++ code run an order of magnitude slower than the equivalent Python code. Since my C++ is rusty and I'm not yet an expert Pythonista, please tell me if I'm doing something wrong or if I'm mis...
Specify custom Date format for colClasses argument in read.table/read.csv
...ere a way to specify the Date format when using the colClasses argument in read.table/read.csv?
4 Answers
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Pandas: Looking up the list of sheets in an excel file
...'foo.xls')
xl.sheet_names # see all sheet names
xl.parse(sheet_name) # read a specific sheet to DataFrame
see docs for parse for more options...
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What is the Difference Between read() and recv() , and Between send() and write()?
What is the difference between read() and recv() , and between send() and write() in socket programming in terms of performances, speed and other behaviors?
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