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Accessing dict keys like an attribute?
... Unless - of course - you assign some value to them, see below)
Attributes and items are always in sync
Trying to access non-existent key as an attribute correctly raises AttributeError instead of KeyError
Supports [Tab] autocompletion (e.g. in jupyter & ipython)
Cons:
Methods like .keys() wil...
count the frequency that a value occurs in a dataframe column
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Use groupby and count:
In [37]:
df = pd.DataFrame({'a':list('abssbab')})
df.groupby('a').count()
Out[37]:
a
a
a 2
b 3
s 2
[3 rows x 1 columns]
See the online docs: http://pandas.pydata.org/pandas-docs/stable/groupby.html
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Spring Boot application as a Service
... system? Is this recommended approach, or should I convert this app to war and install it into Tomcat?
19 Answers
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Specifying and saving a figure with exact size in pixels
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Matplotlib doesn't work with pixels directly, but rather physical sizes and DPI. If you want to display a figure with a certain pixel size, you need to know the DPI of your monitor. For example this link will detect that for you.
If you have an image of 3841x7195 pixels it is unlikely that you m...
Tool for comparing 2 binary files in Windows [closed]
...ndows, it will either appear not to start, or will very briefly show a command prompt window, which quickly disappears. Open up a command prompt and run the program from there to see what arguments it accepts, and then use it from the command prompt accordingly.
– nonoitall
...
Javascript shorthand ternary operator
...urn true or false, it returns the first 'truthy' value. Say you have val0 and val1 as undefined, and val2 is 2, val3 is 3. val0 || val1 || val2 || val3 will return 2, as it is the first 'truthy' value.
– Jake T.
May 2 '18 at 15:54
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AttributeError: 'module' object has no attribute 'urlopen'
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@Sergio: exactly! And through the indentation you see where your file is still opened.
– eumiro
Oct 19 '10 at 15:16
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pg_config executable not found
...ed to install the Homebrew package manager first in order for the brew command to work.
– seane
Dec 2 '14 at 20:49
Wor...
Extracting .jar file with command line
...m trying to extract the files from a .jar file. How do I do that using command line?
8 Answers
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Get last n lines of a file, similar to tail
I'm writing a log file viewer for a web application and for that I want to paginate through the lines of the log file. The items in the file are line based with the newest item on the bottom.
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