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Add new field to every document in a MongoDB collection
How can I add a new field to every document in an em>x m>istent collection?
5 Answers
5
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What is a ViewModelLocator and what are its pros/cons compared to DataTemplates?
...is approach: it doesn't play well with visual designers such as Microsoft Em>x m>pression Blend.
The problem is that in both normal application runs and unit test runs, someone has to set up the container with instructions on what types to resolve; additionally, someone has to ask the container to resol...
case-insensitive list sorting, without lowercasing the result?
...trings, since they both have a lower method.
In Python 2 it works for a mim>x m> of normal and unicode strings, since values of the two types can be compared with each other. Python 3 doesn't work like that, though: you can't compare a byte string and a unicode string, so in Python 3 you should do the s...
Changing my CALayer's anchorPoint moves the view
...r Geometry and Transforms section of the Core Animation Programming Guide em>x m>plains the relationship between a CALayer's position and anchorPoint properties. Basically, the position of a layer is specified in terms of the location of the layer's anchorPoint. By default, a layer's anchorPoint is (0....
How to linebreak an svg tem>x m>t within javascript?
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This is not something that SVG 1.1 supports. SVG 1.2 does have the tem>x m>tArea element, with automatic word wrapping, but it's not implemented in all browsers. SVG 2 does not plan on implementing tem>x m>tArea, but it does have auto-wrapped tem>x m>t.
However, given that you already know where your linebr...
What does the 'b' character do in front of a string literal?
Apparently, the following is the valid syntam>x m>:
8 Answers
8
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Understanding Python's “is” operator
...the is operator:
The operators is and is not test for object identity: m>x m> is y is true if and only if m>x m> and y are the same object.
Use the == operator instead:
print(m>x m> == y)
This prints True. m>x m> and y are two separate lists:
m>x m>[0] = 4
print(y) # prints [1, 2, 3]
print(m>x m> == y) # prints Fals...
Catching error codes in a shell pipe
...ell programming uses:
tmp=${TMPDIR:-/tmp}/mine.$$
trap 'rm -f $tmp.[12]; em>x m>it 1' 0 1 2 3 13 15
...if statement as before...
rm -f $tmp.[12]
trap 0 1 2 3 13 15
The first trap line says 'run the commands 'rm -f $tmp.[12]; em>x m>it 1' when any of the signals 1 SIGHUP, 2 SIGINT, 3 SIGQUIT, 13 SIGPIPE, or...
Date ticks and rotation in matplotlib
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If you prefer a non-object-oriented approach, move plt.m>x m>ticks(rotation=70) to right before the two avail_plot calls, eg
plt.m>x m>ticks(rotation=70)
avail_plot(am>x m>s[0], dates, s1, 'testing', 'green')
avail_plot(am>x m>s[1], dates, s1, 'testing2', 'red')
This sets the rotation property be...
Why must a lambda em>x m>pression be cast when supplied as a plain Delegate parameter
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A lambda em>x m>pression can either be converted to a delegate type or an em>x m>pression tree - but it has to know which delegate type. Just knowing the signature isn't enough. For instance, suppose I have:
public delegate void Action1();
publ...