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How to write DataFrame to postgres table?
...create_engine
engine = create_engine('postgresql://scott:tiger@localhost:5432/mydatabase')
df.to_sql('table_name', engine)
You are correct that in pandas up to version 0.13.1 postgresql was not supported. If you need to use an older version of pandas, here is a patched version of pandas.io.sql: ...
Circular list iterator in Python
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163
Use itertools.cycle, that's its exact purpose:
from itertools import cycle
lst = ['a', 'b', 'c...
Using jQuery to center a DIV on the screen
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83
Why isn't this a native part of jQuery's functionality?
– Seth Carnegie
Jul 6 '11 at 21:54
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Random float number generation
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388
rand() can be used to generate pseudo-random numbers in C++. In combination with RAND_MAX and...
PostgreSQL LIKE query performance variations
...thin 200-400 ms (very acceptable) but other times it might take as much as 30 seconds to return results.
8 Answers
...
adding x and y axis labels in ggplot2
...("ggplot2")
ggplot(ex1221, aes(Discharge, Area)) +
geom_point(aes(size=NO3)) +
scale_size_area() +
xlab("My x label") +
ylab("My y label") +
ggtitle("Weighted Scatterplot of Watershed Area vs. Discharge and Nitrogen Levels (PPM)")
ggplot(ex1221, aes(Discharge, Area)) +
geom_point(a...
Lock Escalation - What's happening here?
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3 Answers
3
Active
...
Tri-state Check box in HTML?
...ution:
HTML5 defines a property for checkboxes called indeterminate
See w3c reference guide. To make checkbox appear visually indeterminate set it to true:
element.indeterminate = true;
Here is Janus Troelsen's fiddle. Note, however, that:
The indeterminate state cannot be set in the HTML mar...
Java: method to get position of a match in a String?
...ward (or backward) starting at the specified index].
String text = "0123hello9012hello8901hello7890";
String word = "hello";
System.out.println(text.indexOf(word)); // prints "4"
System.out.println(text.lastIndexOf(word)); // prints "22"
// find all occurrences forward
for (int i = -1; (i = te...
Fastest way to extract frames using ffmpeg?
...e frames uncompressed as BMP images:
ffmpeg -i file.mpg -r 1/1 $filename%03d.bmp
This also has the advantage of not incurring more quality loss through quantization by transcoding to JPEG. (PNG is also lossless but tends to take much longer than JPEG to encode.)
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