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Serializing a list to JSON
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doesen't like cyclical relationships but that is not a problem here
– Jodrell
Feb 2 '12 at 10:53
13
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difference and when to use getApplication(), getApplicationContext(), getBaseContext() and someClass
...ew to android and I'm trying to understand the difference between getApplication() , getApplicationContext( ), getBaseContext() , getContext() and someClass.this and especially when to use the these methods in the following code lines:
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JdbcTemplate queryForInt/Long is deprecated in Spring 3.2.2. What should it be replaced by?
The queryforInt/queryforLong methods in JdbcTemplate are deprecated in Spring 3.2. I can't find out why or what is considered the best practice to replace existing code using these methods.
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How to form tuple column from two columns in Pandas
...olumn data.
df['new_col'] = list(zip(df.lat, df.long))
It's less complicated and faster than using apply or map. Something like np.dstack is twice as fast as zip, but wouldn't give you tuples.
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How can I do DNS lookups in Python, including referring to /etc/hosts?
...if you want to do DNS lookups yourself or if you just want a host's ip. In case you want the latter,
import socket
print(socket.gethostbyname('localhost')) # result from hosts file
print(socket.gethostbyname('google.com')) # your os sends out a dns query
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How to write header row with csv.DictWriter?
...ve a csv.DictReader object and I want to write it out as a CSV file. How can I do this?
3 Answers
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Closing WebSocket correctly (HTML5, Javascript)
... the server closes a client connection. The normal TCP socket close method can sometimes be slow and cause applications to think the connection is still open even when it's not.
The browser should really do this for you when you close or reload the page. However, you can make sure a close frame is ...
How to edit a node module installed via npm?
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You can edit the file directly, but this would be overwritten whenever npm updates, the best thing to do is go straight to the source.
If the changes affect functionality of the overall module, and may be useful to others, you m...
Maven project.build.directory
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You can find those maven properties in the super pom.
You find the jar here:
${M2_HOME}/lib/maven-model-builder-3.0.3.jar
Open the jar with 7-zip or some other archiver (or use the jar tool).
Navigate to
org/apache/maven/mo...
C# version of java's synchronized keyword?
...hodImplOptions.Synchronized)]
public void SomeMethod() {/* code */}
This can also be used on accessors (properties and events):
private int i;
public int SomeProperty
{
[MethodImpl(MethodImplOptions.Synchronized)]
get { return i; }
[MethodImpl(MethodImplOptions.Synchronized)]
set ...