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Way to read first few lines for pandas dataframe
...88504479 bytes, 5344499 lines):
In [1]: import pandas as pd
In [2]: time z = pd.read_csv("P00000001-ALL.csv", nrows=20)
CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s
Wall time: 0.00 s
In [3]: len(z)
Out[3]: 20
In [4]: time z = pd.read_csv("P00000001-ALL.csv")
CPU times: user 27.63 s, sys: 1...
Is there a (repeat-last-command) in Emacs?
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51.2k3737 gold badges119119 silver badges146146 bronze badges
answered Nov 9 '08 at 12:35
cmscms
5,37022 gold badges2424 silver ba...
How can I delete the current line in Emacs?
...backspace # deletes previous 5 whole lines
Sometimes I also find C-x z helpful:
C-S-backspace # delete 1 whole line
C-x z # repeat last command
z # repeat last command again.
# Press z as many times as you wish.
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What is %2C in a URL?
... 19 | EM | 39 | 9 | 59 | Y | 79 | y |
| 1A | SUB | 3A | : | 5A | Z | 7A | z |
| 1B | ESC | 3B | ; | 5B | [ | 7B | { |
| 1C | FS | 3C | < | 5C | \ | 7C | | |
| 1D | GS | 3D | = | 5D | ] | 7D | } |
| 1E | RS | 3E | > | 5E | ^ | 7E | ~ |
| 1F | US | 3F | ...
Matplotlib: draw grid lines behind other graph elements
...ording to this - http://matplotlib.1069221.n5.nabble.com/axis-elements-and-zorder-td5346.html - you can use Axis.set_axisbelow(True)
(I am currently installing matplotlib for the first time, so have no idea if that's correct - I just found it by googling "matplotlib z order grid" - "z order" is typ...
When is null or undefined used in JavaScript? [duplicate]
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answered Jun 21 '11 at 17:29
kennebeckennebec
89.8k2828 gold badges9...
Convert light frequency to RGB?
... Mesa
4,31333 gold badges2121 silver badges1616 bronze badges
5
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How would you make two s overlap?
...ayout */
left: 75px;
top: 0px;
width: 300px;
height: 200px;
z-index: 2;
}
#content {
margin-top: 100px; /* Provide buffer for logo */
}
#links {
height: 75px;
margin-left: 400px; /* Flush links (with a 25px "padding") right of logo */
}
<div id="logo">
<img ...
return query based on date
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db.gpsdatas.find({"createdAt" : { $gte : new ISODate("2012-01-12T20:15:31Z") }});
I'm using $gte (greater than or equals), because this is often used for date-only queries, where the time component is 00:00:00.
If you really want to find a date that equals another date, the syntax would be
db....
new Date() works differently in Chrome and Firefox
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The correct format for UTC would be 2013-02-27T17:00:00Z (Z is for Zulu Time). Append Z if not present to get correct UTC datetime string.
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