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What is the python “with” statement designed for?
...me, so I only add it for the sake of completeness: the with statement simplifies exception handling by encapsulating common preparation and cleanup tasks in so-called context managers. More details can be found in PEP 343. For instance, the open statement is a context manager in itself, which lets y...
How to make Git “forget” about a file that was tracked but is now in .gitignore?
There is a file that was being tracked by git , but now the file is on the .gitignore list.
27 Answers
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Filtering Pandas DataFrames on dates
I have a Pandas DataFrame with a 'date' column. Now I need to filter out all rows in the DataFrame that have dates outside of the next two months. Essentially, I only need to retain the rows that are within the next two months.
...
dealloc in Swift
I would like to perform some cleanup at the end of a view controller's life, namely to remove an NSNotificationCenter notification. Implementing dealloc results in a Swift compiler error:
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How to stop a JavaScript for loop?
...nd assigning something to `remData`... */
remIndex = -1; // Set a default if we don't find it
for (i = 0; i < remSize.length; i++) {
// I'm looking for the index i, when the condition is true
if (remSize[i].size === remData.size) {
remIndex = i;
break; /...
bash HISTSIZE vs. HISTFILESIZE?
...tappend is not enabled, commands 41 to 50 are saved to your HISTFILE which now has the 10 commands it held at the beginning plus the 10 newly written commands.
Your HISTFILE is truncated to contain HISTFILESIZE=10 lines.
You now have 10 commands in your history - the last 10 that you just typed in ...
How to send a correct authorization header for basic authentication
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If you are in a browser environment you can also use btoa.
btoa is a function which takes a string as argument and produces a Base64 encoded ASCII string. Its supported by 97% of browsers.
Example:
> "Basic " + btoa("bi...
Matplotlib scatterplot; colour as a function of a third variable
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There's no need to manually set the colors. Instead, specify a grayscale colormap...
import numpy as np
import matplotlib.pyplot as plt
# Generate data...
x = np.random.random(10)
y = np.random.random(10)
# Plot...
plt.scatter(x, y, c=y, s=500)
plt.gray()
plt.show()
Or, if ...
Diff output from two programs without temporary files
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Use <(command) to pass one command's output to another program as if it were a file name. Bash pipes the program's output to a pipe and passes a file name like /dev/fd/63 to the outer command.
diff <(./a) <(./b)
Similarly you can use >(command) if you want to pipe something into...
How to detect escape key press with pure JS or jQuery?
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@LachlanMcD - be aware (5 years later!) that .unbind is now deprecated as of jQuery 3.0... you should use .off
– freefaller
Apr 24 '18 at 14:07
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