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How to write DataFrame to postgres table?
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Starting from pandas 0.14 (released end of May 2014), postgresql is supported. The sql module now uses sqlalchemy to support different database flavors. You can pass a sqlalchemy engine for a postgresql database (see docs). E.g.:
from sqlalchemy im...
How to attach javadoc or sources to jars in libs folder?
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401
The best way to answer your question is to summarize the answers from Xavier, plastiv, VinceFR...
How to get current timestamp in milliseconds since 1970 just the way Java gets
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247
If you have access to the C++ 11 libraries, check out the std::chrono library. You can use it t...
SparseArray vs HashMap
...ray {
int[] keys;
int[] values;
int size;
}
Class = 12 + 3 * 4 = 24 bytes
Array = 20 + 1000 * 4 = 4024 bytes
Total = 8,072 bytes
HashMap:
class HashMap<K, V> {
Entry<K, V>[] table;
Entry<K, V> forNull;
int size;
int modCount;
int threshold;
S...
Difference between Eclipse Europa, Helios, Galileo
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224
The Eclipse (software) page on Wikipedia summarizes it pretty well:
Releases
Since 2006...
What does the ^ operator do in Java?
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422
The ^ operator in Java
^ in Java is the exclusive-or ("xor") operator.
Let's take 5^6 as exa...
How to remove only underline from a:before?
...e blocks and inline tables.
(Emphasis mine.)
Demo: http://jsfiddle.net/r42e5/10/
Thanks to @Oriol for providing the workaround that prompted me to check the specs and see that the workaround is legal.
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Determine whether an array contains a value [duplicate]
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edited Jan 5 '16 at 2:46
answered Jul 25 '09 at 8:22
ey...
Calculate the median of a billion numbers
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edited Apr 3 '10 at 14:56
answered Apr 3 '10 at 14:15
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Redis: Show database size/size for keys
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edited Nov 10 '16 at 18:46
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