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Difference between volatile and synchronized in Java
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It's important to understand that there are two aspects to thread safety.
execution control, and
memory visibility
The first has to do with controlling when code executes (including the order in which instructions are executed) and whether it can execute concurrently, and the sec...
Read Excel File in Python
...directly a column of an excel file:
import pandas
import xlrd
df = pandas.read_excel('sample.xls')
#print the column names
print df.columns
#get the values for a given column
values = df['Arm_id'].values
#get a data frame with selected columns
FORMAT = ['Arm_id', 'DSPName', 'Pincode']
df_selected =...
Is volatile expensive?
After reading The JSR-133 Cookbook for Compiler Writers about the implementation of volatile, especially section "Interactions with Atomic Instructions" I assume that reading a volatile variable without updating it needs a LoadLoad or a LoadStore barrier. Further down the page I see that LoadLoad ...
Read .mat files in Python
Is it possible to read binary MATLAB .mat files in Python?
8 Answers
8
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How does Hadoop process records split across block boundaries?
...bytesRemaining -= splitSize;
}
After that, if you look at the LineRecordReader which is defined by the TextInputFormat, that's where the lines are handled:
When you initialize your LineRecordReader it tries to instantiate a LineReader which is an abstraction to be able to read lines over FSData...
How to search for a string in text files?
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The reason why you always got True has already been given, so I'll just offer another suggestion:
If your file is not too large, you can read it into a string, and just use that (easier and often faster than reading and checking line per line):
with open('example....
Read text file into string array (and write)
The ability to read (and write) a text file into and out of a string array is I believe a fairly common requirement. It is also quite useful when starting with a language removing the need initially to access a database. Does one exist in Golang?
e.g.
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Volatile Vs Atomic [duplicate]
I read somewhere below line.
6 Answers
6
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How to use phpexcel to read data and insert into database?
I have a php application where I want to read data from excel, Insert into database and then generate pdf reports for specific users.
I searched a lot but nothing specific given about both things.
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Save and load MemoryStream to/from a file
...ystem.IO.FileAccess.Write)) {
byte[] bytes = new byte[ms.Length];
ms.Read(bytes, 0, (int)ms.Length);
file.Write(bytes, 0, bytes.Length);
ms.Close();
}
and this reads a file to a MemoryStream :
using (MemoryStream ms = new MemoryStream())
using (FileStream file = new FileStream("file.b...