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krfont = {'family' : 'gulim', 'weight' : 'bold', 'size'   : 12}
plt.rc('font', **krfont) #한글 폰트를 지정 안하면 글씨가 안나옴 ㅠㅠ

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List<String> list = new ArrayList<String>();

list.add("A");
list.add("A");
list.add("B");
list.add("C");

Map<String, Integer> cntMap = list.stream().collect(
	Collectors.groupingBy(
		Function.identity(), 

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docker run --name mariadb -d -p 3306:3306 -e MYSQL_ROOT_PASSWORD=1234 mariadb

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Completable som1 = Completable.fromAction(() -> System.out.println("Hello World")).subscribeOn(Schedulers.io());
Completable som2 = Completable.fromAction(() -> System.out.println("Foo bar")).subscribeOn(Schedulers.io());

Completable.merge(som1, som2).await();
System.out.println("await done");

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sudo pip install --upgrade virtualenv
virtualenv --system-site-packages ~/tensorflow
source ~/tensorflow/bin/activate

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import warnings
warnings.filterwarnings('ignore')

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df.join(df2.set_index('column_name'), rsuffix='_parent', on='column_name')

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sudo pm2 start process.json --only development

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gradle init --type pom

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package(default_visibility = [":internal"])

licenses(["notice"])  # Apache 2.0

exports_files(["LICENSE"])

package_group(
    name = "internal",
    packages = [
        "//im2txt/...",