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Running karma after installation results in 'karma' is not recognized as an internal or external com
...ach project you're working on and karma-cli will pick the appropriate one.
From the karma installation page:
Typing ./node_modules/karma/bin/karma start sucks so you might find it useful to install karma-cli globally:
npm install -g karma-cli
Now, check that karma was installed by typing:
which kar...
List comprehension rebinds names even after scope of comprehension. Is this right?
...don't. While this makes some sense in that the former were all back-ported from Python 3, it really makes the contrast with list comprehensions jarring.
– Matt B.
Nov 27 '11 at 20:47
...
How assignment works with Python list slice?
...ans "make a copy of a slice of" which is where part of the confusion comes from.
– Mark Ransom
May 16 '12 at 17:12
2
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Why do I need Transaction in Hibernate for read-only operations?
... is DB specific. E.g. MySQL added support for this only in InnoDB starting from 5.6.4 version.
If you're not using JDBC directly, but rather an ORM, that might be problematic. For instance Hibernate community says that working outside of transaction might cause unpredictable behavior. This is becaus...
PHP - how to create a newline character?
...nd in single quoted string. Are there any other such HTML characters apart from these three that can be understood by PHP inside the single quoted strings? I kindly request you to update your answer accordingly. Thank You.
– PHPFan
Nov 18 '17 at 9:17
...
stringstream, string, and char* conversion confusion
My question can be boiled down to, where does the string returned from stringstream.str().c_str() live in memory, and why can't it be assigned to a const char* ?
...
Calculate total seconds in PHP DateInterval
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This function allows you to get the total duration in seconds from a DateInterval object
/**
* @param DateInterval $dateInterval
* @return int seconds
*/
function dateIntervalToSeconds($dateInterval)
{
$reference = new DateTimeImmutable;
$endTime = $reference->add($dateIn...
What exactly does the “u” do? “git push -u origin master” vs “git push origin master”
...
The key is "argument-less git-pull". When you do a git pull from a branch, without specifying a source remote or branch, git looks at the branch.<name>.merge setting to know where to pull from. git push -u sets this information for the branch you're pushing.
To see the differen...
How do I count unique values inside a list
...
In addition, use collections.Counter to refactor your code:
from collections import Counter
words = ['a', 'b', 'c', 'a']
Counter(words).keys() # equals to list(set(words))
Counter(words).values() # counts the elements' frequency
Output:
['a', 'c', 'b']
[2, 1, 1]
...
Pandas dataframe get first row of each group
...
suppose that counting from the top you want to get row number top_n, then dx = df.groupby('id').head(top_n).reset_index(drop=True) and suppose that counting from the bottom you want to get row number bottom_n, then dx = df.groupby('id').tail(bott...