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Most efficient way to remove special characters from string
I want to remove all special characters from a string. Allowed characters are A-Z (uppercase or lowercase), numbers (0-9), underscore (_), or the dot sign (.).
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Convert to binary and keep leading zeros in Python
...ction in Python. However, it always removes the leading zeros, which I actually need, such that the result is always 8-bit:
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How to convert a byte array to a hex string in Java?
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From the discussion here, and especially this answer, this is the function I currently use:
private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
public static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2...
Adding new column to existing DataFrame in Python pandas
... because if you have multiple rows, and you use the assignment, it assigns all rows of the new column with that value ( in your case e) which is usually undesirable.
– Paniz
Apr 27 '19 at 22:42
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Views vs Components in Ember.js
... and then implement their behavior using JavaScript? You can't do this actually with a Ember.View.
Ember.Component
That's exactly what components let you do. In fact, it's such a good idea that the W3C is currently working on the Custom Elements spec.
Ember's implementation of components tries to be...
What is the difference between String.Empty and “” (empty string)?
...ich makes string.Empty more efficient.
In version 2.0 and later of .NET, all occurrences of "" refer to the same string literal, which means "" is equivalent to .Empty, but still not as fast as .Length == 0.
.Length == 0 is the fastest option, but .Empty makes for slightly cleaner code.
See the ...
How can I get a user's media from Instagram without authenticating as a user?
...1/users/<user-id>/media/recent/ (at present time of writing) you actually do not need OAuth access token.
You can perform https://api.instagram.com/v1/users/[USER ID]/media/recent/?client_id=[CLIENT ID]
[CLIENT ID] would be valid client id registered in app through manage clients (not relate...
Is there a NumPy function to return the first index of something in an array?
...:
itemindex = numpy.where(array==item)
The result is a tuple with first all the row indices, then all the column indices.
For example, if an array is two dimensions and it contained your item at two locations then
array[itemindex[0][0]][itemindex[1][0]]
would be equal to your item and so woul...
Getting the error “Missing $ inserted” in LaTeX
...ommand, which will typeset the text in a monospaced font and will automatically handle underscores and bars correctly (no need to escape them with \).
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How to set Python's default version to 3.x on OS X?
...n use command python, which will leaving the alias untouched, and works in all shells.
If you launch interpreters more often (I do), you can always create more aliases to add as well, i.e.:
alias 2='python2'
alias 3='python3'
Tip: For scripts, instead of using a shebang like:
#!/usr/bin/env p...