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How to empty a list?
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This actually removes the contents from the list, but doesn't replace the old label with a new empty list:
del lst[:]
Here's an example:
lst1 = [1, 2, 3]
lst2 = lst1
del lst1[:]
print(lst2)
For the sake of completeness, the slice assignment has the same effect:
lst[:]...
What does the ^ operator do in Java?
... exclusive-or ("xor") operator.
Let's take 5^6 as example:
(decimal) (binary)
5 = 101
6 = 110
------------------ xor
3 = 011
This the truth table for bitwise (JLS 15.22.1) and logical (JLS 15.22.2) xor:
^ | 0 1 ^ | F T
--+----- --+-----
0 | 0 1 F |...
month name to month number and vice versa in python
I am trying to create a function that can convert a month number to an abbreviated month name or an abbreviated month name to a month number. I thought this might be a common question but I could not find it online.
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Command line for looking at specific port
... know I can use netstat to examine all ports but netstat is slow and looking at a specific port probably isn't.
13 Answers
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Can someone give an example of cosine similarity, in a very simple, graphical way?
...se texts are, purely in terms of word counts (and ignoring word order). We begin by making a list of the words from both texts:
me Julie loves Linda than more likes Jane
Now we count the number of times each of these words appears in each text:
me 2 2
Jane 0 1
Julie 1 1
Linda 1...
How to force 'cp' to overwrite directory instead of creating another one inside?
I'm trying to write a Bash script that will overwrite an existing directory. I have a directory foo/ and I am trying to overwrite bar/ with it. But when I do this:
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Why does “split” on an empty string return a non-empty array?
...','
and
",test," split ','
will return an array of size 2. Everything before the first match is returned as the first element.
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What is the difference between .yaml and .yml extension? [duplicate]
...y understood the main difference between them. I saw there are someone using .yaml extension, however, Symfony2 use .yml extension.
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How to convert char to int?
What is the proper way to convert a char to int ?
This gives 49 :
11 Answers
11
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What's the difference between a proc and a lambda in Ruby?
...ing a proc using proc {} and Proc.new {} are equivalent. However, using lambda {} gives you a proc that checks the number of arguments passed to it. From ri Kernel#lambda:
Equivalent to Proc.new, except the resulting Proc objects check the number of parameters passed when called.
An example:
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