This document contains code snippets in Python and Java demonstrating basic programming concepts like lists, dictionaries, loops, functions, classes, and JSON serialization. It also shows how to create a simple Flask web app in Python.

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17. pow_datas = [i ** 2 for i in range(5)]
# [0, 1, 4, 9, 16]
a = 1
b = 2
a, b = b, a
# a = 2, b = 1
data = [6, 2, 1, 4]
print(len(data))
# 4
print(list(reversed(data)))
# [4, 1, 2, 6]
print(sorted(data))
# [1, 2, 4, 6]
print(type(data))
# <class 'list'>
print(isinstance(data, list))
# True

18. Map<String, Object> data = new HashMap<>();
data.put("name", "조민규");
data.put("age", 18);
Map<String, String> belongs = new HashMap<>();
belongs.put("company", "ab180");
belongs.put("school", "DSM");
belongs.put("home", "Suncheon");
data.put("belong", belongs)
JSONObject jsonData = new JSONObject();
json.putAll(data);
System.out.println(data)
import json
data = {
'name': '조민규’,
'age': 18,
'belong': {
'company': 'ab180’,
'school': 'DSM’,
'home': 'Suncheon’
}
}
print(json.dumps(data))

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26. from flask import Flask
app = Flask(__name__)
@app.route('/')
def index():
return '와! 안녕!'
if __name__ == '__main__’:
app.run(port=5959)
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