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Calculating arithmetic mean (one type of average) in Python
...eturn float(sum(numbers)) / max(len(numbers), 1)
>>> mean([1,2,3,4])
2.5
>>> mean([])
0.0
In numpy, there's numpy.mean().
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MySQL Removing Some Foreign keys
...
457
As explained here, seems the foreign key constraint has to be dropped by constraint name and n...
Test if lists share any items in python
...="a=list(range(1000));b=list(range(1000))", number=100000)
26.077727576019242
>>> timeit('any(i in a for i in b)', setup="a=list(range(1000));b=list(range(1000))", number=100000)
0.16220548999262974
Here's a graph of the execution time for this example in function of list size:
Note th...
联网 App 第 3 课：点击挑战排行榜，字典存成绩、破纪录才写回、按分数排序...
...归并排序，条件为假时把后面那个放前面。写 > 时两个 42 次比较结果为假，同分的人先后会被打乱；写 >= 时相等也算真，同分的人保持原来的先后，先上榜的排前面。
只想从小到大，用更简单的「排序」积木（sort(列表)）；...
Skip certain tables with mysqldump
...=databasename
DB_FILE=dump.sql
EXCLUDED_TABLES=(
table1
table2
table3
table4
tableN
)
IGNORED_TABLES_STRING=''
for TABLE in "${EXCLUDED_TABLES[@]}"
do :
IGNORED_TABLES_STRING+=" --ignore-table=${DATABASE}.${TABLE}"
done
echo "Dump structure"
mysqldump --host=${HOST} --user=${USER} --password...
How to manage client-side JavaScript dependencies? [closed]
...
45
+250
require...
Pass variables to Ruby script via command line
...
opts.on('-n', '--sourcename NAME', 'Source name') { |v| options[:source_name] = v }
opts.on('-h', '--sourcehost HOST', 'Source host') { |v| options[:source_host] = v }
opts.on('-p', '--sourceport PORT', 'Source port') { |v| options[:source_port] = v }
end.parse!
dest_options = YAML.load_fi...
Mismatched anonymous define() module
...
143
Like AlienWebguy said, per the docs, require.js can blow up if
You have an anonymous define (...
How do I read from parameters.yml in a controller in symfony2?
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Vitalii ZurianVitalii Zurian
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