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What is the difference between screenX/Y, clientX/Y and pageX/Y?

...upper left. This point could be anywhere in the browser window and can actually change location if there are embedded scrollable pages embedded within pages and the user moves a scrollbar. screenX and screenY: Relative to the top left of the physical screen/monitor, this reference point only moves ...
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How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?

...tionaries in a single expression? For dictionaries x and y, z becomes a shallowly merged dictionary with values from y replacing those from x. In Python 3.5 or greater: z = {**x, **y} In Python 2, (or 3.4 or lower) write a function: def merge_two_dicts(x, y): z = x.copy() # start with x's ...
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How to download image using requests

...flate). You can force it to decompress for you anyway by setting the decode_content attribute to True (requests sets it to False to control decoding itself). You can then use shutil.copyfileobj() to have Python stream the data to a file object: import requests import shutil r = requests.get(settin...
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Logical operators (“and”, “or”) in DOS batch

...an implicit conjunction. IF Exist File1.Dat IF Exist File2.Dat GOTO FILE12_EXIST_LABEL If File1.Dat and File1.Dat exist then jump the label FILE12_EXIST_LABEL. See also: IF /? share | improve th...
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import module from string variable

... Finally, also remember that you can't import anything if there is no __init__.py in the folder with file you are trying to import. – Seanny123 Dec 6 '13 at 7:31 ...
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Random row selection in Pandas dataframe

... Thanks @eumiro. I also worked out that df.ix[np.random.random_integers(0, len(df), 10)] would also work. – John Apr 10 '13 at 10:58 7 ...
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When to encode space to plus (+) or %20?

...value is query value with a space, but the folder name in the path is literally foo+bar, not foo bar. %20 is a valid way to encode a space in either of these contexts. So if you need to URL-encode a string for inclusion in part of a URL, it is always safe to replace spaces with %20 and pluses with ...
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How to set java_home on Windows 7?

... Find JDK Installation Directory First you need to know the installation path for the Java Development Kit. Open the default installation path for the JDK: C:\Program Files\Java There should be a subdirectory like: C:\Program Files\J...
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How to define a two-dimensional array?

... You're technically trying to index an uninitialized array. You have to first initialize the outer list with lists before adding items; Python calls this "list comprehension". # Creates a list containing 5 lists, each of 8 items, all set t...
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Image Greyscale with CSS & re-color on mouse-over?

...rayscale(100%); /* Chrome 19+ & Safari 6+ */ -webkit-transition: all .6s ease; /* Fade to color for Chrome and Safari */ -webkit-backface-visibility: hidden; /* Fix for transition flickering */ } img.grayscale:hover { filter: none; -webkit-filter: grayscale(0%); } sv...