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python numpy machine epsilon
I am trying to understand what is machine epsilon. According to the Wikipedia, it can be calculated as follows:
3 Answers
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Custom Adapter for List View
...list view. Is there any article that can walk me through how to create one and also explain how it works?
13 Answers
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Iterating through directories with Python
I need to iterate through the subdirectories of a given directory and search for files. If I get a file I have to open it and change the content and replace it with my own lines.
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Adding a cross-reference to a subheading or anchor in another page
...the scope of the question unclear. Is it about reStructuredText in general and Sphinx, or only about reStructuredText as used in Sphinx (and not reStructuredText in general)? I'm going to cover both since people using RST are likely to run into both cases at some point:
Sphinx
Besides the domain-s...
In Python, how do I iterate over a dictionary in sorted key order?
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This is not obvious. In fact, items() creates a list and therefore uses memory, whereas iteritems() essentially does not use memory. What to use mostly depend on the size of the dictionary. Furthermore, the automatic Python 2 to Python 3 conversion tool (2to3) automatically tak...
How to read the mode field of git-ls-tree's output
...digits show file type, the third one is about set-uid/set-gid/sticky bits, and you know the last three.
Here is how man 2 stat documents it on my GNU/Linux system:
The following flags are defined for the st_mode field:
S_IFMT 0170000 bit mask for the file type bit fields
S_...
How to display request headers with command line curl
Command line curl can display response header by using -D option, but I want to see what request header it is sending. How can I do that?
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How do I specify unique constraint for multiple columns in MySQL?
... For those people using MySQL workbench: go to the Indexes tab and select UNIQUE as your type. Give your index a name and check the appropriate columns under the section "Index Columns"
– Pakman
Jun 3 '13 at 20:42
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Illegal mix of collations MySQL Error
...ly refuses to change from 'ucs2_bin' so even tried changing all the tables and the connection collation to 'usc2_bin' but I still get the error "SQL Error (1267): Illegal mix of collations (utf8_general_ci,IMPLICIT) and (ucs2_bin,IMPLICIT) for operation '='".
– bikeman868
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Collections.emptyList() vs. new instance
...ses where you do want to modify the returned list, Collections.emptyList() and List.of() are thus not a good choices.
I'd say that returning an immutable list is perfectly fine (and even the preferred way) as long as the contract (documentation) does not explicitly state differently.
In addition...