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How to write to file in Ruby?
I need to read the data out of database and then save it in a text file.
7 Answers
7
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Local Storage vs Cookies
...kies and local storage serve different purposes. Cookies are primarily for reading server-side, local storage can only be read by the client-side. So the question is, in your app, who needs this data — the client or the server?
If it's your client (your JavaScript), then by all means switch. You'...
Why use Ruby's attr_accessor, attr_reader and attr_writer?
...
You may use the different accessors to communicate your intent to someone reading your code, and make it easier to write classes which will work correctly no matter how their public API is called.
class Person
attr_accessor :age
...
end
Here, I can see that I may both read and write the age....
Why do I get a segmentation fault when writing to a “char *s” initialized with a string literal, but
...d, static array of characters,
and this unnamed array may be stored
in read-only memory, and which
therefore cannot necessarily be
modified. In an expression context,
the array is converted at once to a
pointer, as usual (see section 6), so
the second declaration initializes p
to poi...
Python import csv to list
...g the csv module:
import csv
with open('file.csv', newline='') as f:
reader = csv.reader(f)
data = list(reader)
print(data)
Output:
[['This is the first line', 'Line1'], ['This is the second line', 'Line2'], ['This is the third line', 'Line3']]
If you need tuples:
import csv
with...
How to know what the 'errno' means?
...
You can use strerror() to get a human-readable string for the error number. This is the same string printed by perror() but it's useful if you're formatting the error message for something other than standard error output.
For example:
#include <errno.h>
...
How to get the device's IMEI/ESN programmatically in android?
...AndroidManifest.xml:
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
in order to do this.
That being said, be careful about doing this. Not only will users wonder why your application is accessing their telephony stack, it might be difficult to migrate data over if t...
Confused about stdin, stdout and stderr?
...
Standard input - this is the file handle that your process reads to get information from you.
Standard output - your process writes normal information to this file handle.
Standard error - your process writes error information to this file handle.
That's about as dumbed-down as I ...
C# DLL config file
...
if you want to read settings from the DLL's config file but not from the the root applications web.config or app.config use below code to read configuration in the dll.
var appConfig = ConfigurationManager.OpenExeConfiguration(Assembly.Get...
How would you go about parsing Markdown? [closed]
...equently written out to HTML. As such it is quite clean and much easier to read, maintain and extend than a regex based approach.
The PEG grammar is based on John MacFarlanes C implementation "peg-markdown".
Maybe something of interest to you...
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