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Take the content of a list and append it to another list
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You probably want
list2.extend(list1)
instead of
list2.append(list1)
Here's the difference:
>>> a = range(5)
>>> b = range(3)
>>> c = range(2)
>>> b.append(a)
>>> b
[0, 1, 2, [0, 1, 2, 3, 4]]
>>> c.ex...
Dictionaries and default values
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edited Jan 23 '19 at 5:30
Solomon Ucko
2,42022 gold badges1212 silver badges2727 bronze badges
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How do I use the conditional operator (? :) in Ruby?
..., except for precedence issues. Both are expressions.
Examples:
puts (if 1 then 2 else 3 end) # => 2
puts 1 ? 2 : 3 # => 2
x = if 1 then 2 else 3 end
puts x # => 2
Note that in the first case parenthesis are required (otherwise Ruby is confused be...
How to change plot background color?
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You created a figure and axis/es together
fig, ax = plt.subplots(nrows=1, ncols=1)
You created a figure, then axis/es later
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1) # nrows, ncols, index
You used the stateful API (if you're doing anything more than a few lines, and especially if you h...
How to search by key=>value in a multidimensional array in PHP
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15 Answers
15
Active
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How do I parse a URL query parameters, in Javascript? [duplicate]
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129
Today (2.5 years after this answer) you can safely use Array.forEach. As @ricosrealm suggests,...
arrayfun can be significantly slower than an explicit loop in matlab. Why?
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101
You can get the idea by running other versions of your code. Consider explicitly writing out t...
Creating range in JavaScript - strange syntax
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+1000
Understanding this "hack" requires understanding several things:
Why we don't just do Array(5).map(...)
How Function.prototype.ap...
Split function equivalent in T-SQL?
I’m looking to split '1,2,3,4,5,6,7,8,9,10,11,12,13,14,15...' (comma delimited) into a table or table variable.
15 Answ...