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Is a Python list guaranteed to have its elements stay in the order they are inserted in?
...nd places it behind the content of another.
If we have
list1 = [0, 1, 2, 3, 4]
list2 = [5, 6, 7, 8, 9]
Then
list1 + list2
Is the same as
[0, 1, 2, 3, 4] + [5, 6, 7, 8, 9]
Which evaluates to
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Much like
"abdcde" + "fghijk"
Produces
"abdcdefghijk"
...
How do I call setattr() on the current module?
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223
import sys
thismodule = sys.modules[__name__]
setattr(thismodule, name, value)
or, without u...
Error in : object of type 'closure' is not subsettable
....
library(shiny)
reactive_df <- reactive({
data.frame(col1 = c(1,2,3),
col2 = c(4,5,6))
})
While we often work with reactive expressions in shiny as if they were data frames, they are actually functions that return data frames (or other objects).
isolate({
print(reactiv...
How to redirect output with subprocess in Python?
...
UPDATE: os.system is discouraged, albeit still available in Python 3.
Use os.system:
os.system(my_cmd)
If you really want to use subprocess, here's the solution (mostly lifted from the documentation for subprocess):
p = subprocess.Popen(my_cmd, shell=True)
os.waitpid(p.pid, 0)
OTOH,...
`new function()` with lower case “f” in JavaScript
...
3 Answers
3
Active
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Using isKindOfClass with Swift
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answered Jun 14 '14 at 13:29
KPMKPM
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What is the difference between assert, expect and should in Chai?
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edited May 23 '17 at 12:10
Community♦
111 silver badge
answered Jan 28 '14 at 12:01
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Add new value to an existing array in JavaScript [duplicate]
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392
You don't need jQuery for that. Use regular javascript
var arr = new Array();
// or var arr =...
Rails ActionMailer - format sender and recipient name/email address
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237
If you are taking user input for name and email, then unless you very carefully validate or esc...
Numbering rows within groups in a data frame
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answered Oct 16 '12 at 23:41
mnelmnel
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