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Creating a zero-filled pandas data frame
...hat you may run into int/float issue if you will be doing something like d.set_value(params) after initializing d to contain 0's. An easy fix is: d = pd.DataFrame(0.0, index=np.arange(len(data)), columns=feature_list).
– ximiki
Aug 29 '17 at 21:03
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Catch Ctrl-C in C
...ll.html
Note: Obviously, this is a simple example explaining just how to set up a CtrlC handler, but as always there are rules that need to be obeyed in order not to break something else. Please read the comments below.
The sample code from above:
#include <stdio.h>
#include <signal.h...
What is the default form HTTP method?
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onsubmit %Script; #IMPLIED -- the form was submitted --
onreset %Script; #IMPLIED -- the form was reset --
accept-charset %Charsets; #IMPLIED -- list of supported charsets --
>
Good read
Methods GET and POST in HTML forms - what's the difference?
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List comprehension vs. lambda + filter
I happened to find myself having a basic filtering need: I have a list and I have to filter it by an attribute of the items.
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Find the last element of an array while using a foreach loop in PHP
I am writing a SQL query creator using some parameters. In Java, it's very easy to detect the last element of an array from inside the for loop by just checking the current array position with the array length.
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Wrap long lines in Python [duplicate]
How do I wrap long lines in Python without sacrificing indentation?
6 Answers
6
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Why is 128==128 false but 127==127 is true when comparing Integer wrappers in Java?
...it to a Integer (capital I) the compiler emits:
Integer b2 =Integer.valueOf(127)
This line of code is also generated when you use autoboxing.
valueOf is implemented such that certain numbers are "pooled", and it returns the same instance for values smaller than 128.
From the java 1.6 source cod...
.NET data structures: ArrayList, List, HashTable, Dictionary, SortedList, SortedDictionary — Speed,
...SortedDictionary
Another collection that was added in .NET 3.5 is the Hashset. It is a collection that supports set operations.
Also, the LinkedList is a standard linked-list implementation (the List is an array-list for faster retrieval).
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Check existence of input argument in a Bash shell script
...tor. There are other expansion operators as well:
${varname:=word} which sets the undefined varname instead of returning the word value;
${varname:?message} which either returns varname if it's defined and is not null or prints the message and aborts the script (like the first example);
${varname:...
Differences between numpy.random and random.random in Python
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