更新了公开课相关资源

公开课/文档/年薪50W+的Python程序员如何写代码/code/Java/opencourse/opencourse.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module-library">
+      <library>
+        <CLASSES>
+          <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/18.0.0/annotations-18.0.0.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
+  </component>
+</module>

公开课/文档/年薪50W+的Python程序员如何写代码/code/Java/opencourse/src/org/mobiletrain/Example01.java

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+package org.mobiletrain;
+
+class Example01 {
+
+    public static void main(String[] args) {
+        System.out.println("hello, world");
+    }
+}

公开课/文档/年薪50W+的Python程序员如何写代码/code/Java/opencourse/src/org/mobiletrain/Example02.java

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+package org.mobiletrain;
+
+public class Example02 {
+
+    public static void main(String[] args) {
+        int total = 0;
+        for (int i = 1; i <= 100; ++i) {
+            total += i;
+        }
+        System.out.println(total);
+    }
+}

公开课/文档/年薪50W+的Python程序员如何写代码/code/Java/opencourse/src/org/mobiletrain/Example03.java

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+package org.mobiletrain;
+
+import java.util.Arrays;
+
+public class Example03 {
+
+    public static void main(String[] args) {
+        boolean[] values = new boolean[10];
+        Arrays.fill(values, true);
+        System.out.println(Arrays.toString(values));
+
+        int[] numbers = new int[10];
+        for (int i = 0; i < numbers.length; ++i) {
+            numbers[i] = i + 1;
+        }
+        System.out.println(Arrays.toString(numbers));
+    }
+}

公开课/文档/年薪50W+的Python程序员如何写代码/code/Java/opencourse/src/org/mobiletrain/Example04.java

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+package org.mobiletrain;
+
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Scanner;
+
+class Example04 {
+
+    /**
+     * 产生[min, max)范围的随机整数
+     */
+    public static int randomInt(int min, int max) {
+        return (int) (Math.random() * (max - min) + min);
+    }
+
+    /**
+     * 输出一组双色球号码
+     */
+    public static void display(List<Integer> balls) {
+        for (int i = 0; i < balls.size(); ++i) {
+            System.out.printf("%02d ", balls.get(i));
+            if (i == balls.size() - 2) {
+                System.out.print("| ");
+            }
+        }
+        System.out.println();
+    }
+
+    /**
+     * 生成一组随机号码
+     */
+    public static List<Integer> generate() {
+        List<Integer> redBalls = new ArrayList<>();
+        for (int i = 1; i <= 33; ++i) {
+            redBalls.add(i);
+        }
+        List<Integer> selectedBalls = new ArrayList<>();
+        for (int i = 0; i < 6; ++i) {
+            selectedBalls.add(redBalls.remove(randomInt(0, redBalls.size())));
+        }
+        Collections.sort(selectedBalls);
+        selectedBalls.add(randomInt(1, 17));
+        return selectedBalls;
+    }
+
+    public static void main(String[] args) {
+        try (Scanner sc = new Scanner(System.in)) {
+            System.out.print("机选几注: ");
+            int num = sc.nextInt();
+            for (int i = 0; i < num; ++i) {
+                display(generate());
+            }
+        }
+    }
+}

公开课/文档/年薪50W+的Python程序员如何写代码/code/Java/opencourse/src/org/mobiletrain/Example05.java

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+package org.mobiletrain;
+
+import com.sun.net.httpserver.HttpExchange;
+import com.sun.net.httpserver.HttpHandler;
+import com.sun.net.httpserver.HttpServer;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.InetSocketAddress;
+
+class Example05 {
+
+    public static void main(String[] arg) throws Exception {
+        HttpServer server = HttpServer.create(new InetSocketAddress(8000), 0);
+        server.createContext("/", new RequestHandler());
+        server.start();
+    }
+
+    static class RequestHandler implements HttpHandler {
+        @Override
+        public void handle(HttpExchange exchange) throws IOException {
+            String response = "<h1>hello, world</h1>";
+            exchange.sendResponseHeaders(200, 0);
+            try (OutputStream os = exchange.getResponseBody()) {
+                os.write(response.getBytes());
+            }
+        }
+    }
+}

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example01.py

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+print('hello, world')

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example02.py

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+print(sum(range(1, 101)))

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example03.py

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+values = [True] * 10
+print(values)
+numbers = [x for x in range(1, 11)]
+print(numbers)

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example04.py

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+from random import randint, sample
+
+
+def generate():
+    """生成一组随机号码"""
+    red_balls = [x for x in range(1, 34)]
+    selected_balls = sample(red_balls, 6)
+    selected_balls.sort()
+    selected_balls.append(randint(1, 16))
+    return selected_balls
+
+
+def display(balls):
+    """输出一组双色球号码"""
+    for index, ball in enumerate(balls):
+        print(f'{ball:0>2d}', end=' ')
+        if index == len(balls) - 2:
+            print('|', end=' ')
+    print()
+
+
+num = int(input('机选几注: '))
+for _ in range(num):
+    display(generate())

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example05.py

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+from http.server import HTTPServer, SimpleHTTPRequestHandler
+
+
+class RequestHandler(SimpleHTTPRequestHandler):
+
+    def do_GET(self):
+        self.send_response(200)
+        self.end_headers()
+        self.wfile.write('<h1>goodbye, world</h1>'.encode())
+
+
+server = HTTPServer(('', 8000), RequestHandler)
+server.serve_forever()

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example06.py

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+# 一行代码实现求阶乘函数
+fac = lambda x: __import__('functools').reduce(int.__mul__, range(1, x + 1), 1)
+print(fac(5))
+
+# 一行代码实现求最大公约数函数
+gcd = lambda x, y: y % x and gcd(y % x, x) or x
+print(gcd(15, 27))
+
+# 一行代码实现判断素数的函数
+is_prime = lambda x: x > 1 and not [f for f in range(2, int(x ** 0.5) + 1) if x % f == 0]
+for num in range(2, 100):
+    if is_prime(num):
+        print(num, end=' ')
+print()
+
+# 一行代码实现快速排序
+quick_sort = lambda items: len(items) and quick_sort([x for x in items[1:] if x < items[0]]) \
+                           + [items[0]] + quick_sort([x for x in items[1:] if x > items[0]]) \
+                           or items
+items = [57, 12, 35, 68, 99, 81, 70, 22]
+print(quick_sort(items))
+
+# 生成FizzBuzz列表
+# 1 2 Fizz 4 Buzz 6 ... 14 ... FizzBuzz 16 ... 100
+print(['Fizz'[x % 3 * 4:] + 'Buzz'[x % 5 * 4:] or x for x in range(1, 101)])

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example07.py

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+from functools import lru_cache
+
+
+@lru_cache()
+def fib(num):
+    if num in (1, 2):
+        return 1
+    return fib(num - 1) + fib(num - 2)
+
+
+for n in range(1, 121):
+    print(f'{n}: {fib(n)}')

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example08.py

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+from functools import wraps
+from threading import RLock
+
+
+def singleton(cls):
+    instances = {}
+    lock = RLock()
+
+    @wraps(cls)
+    def wrapper(*args, **kwargs):
+        if cls not in instances:
+            with lock:
+                if cls not in instances:
+                    instances[cls] = cls(*args, **kwargs)
+        return instances[cls]
+
+
+@singleton
+class President:
+    pass
+
+
+President = President.__wrapped__

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example09.py

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+import copy
+
+
+class PrototypeMeta(type):
+
+    def __init__(cls, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        cls.clone = lambda self, is_deep=True: \
+            copy.deepcopy(self) if is_deep else copy.copy(self)
+
+
+class Student(metaclass=PrototypeMeta):
+    pass
+
+
+stu1 = Student()
+stu2 = stu1.clone()
+print(stu1 == stu2)
+print(id(stu1), id(stu2))

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part01/example10.py

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+import random
+import time
+
+import requests
+from bs4 import BeautifulSoup
+
+for page in range(10):
+    resp = requests.get(
+        url=f'https://movie.douban.com/top250?start={25 * page}',
+        headers={'User-Agent': 'BaiduSpider'}
+    )
+    soup = BeautifulSoup(resp.text, "lxml")
+    for elem in soup.select('a > span.title:nth-child(1)'):
+        print(elem.text)
+    time.sleep(random.random() * 5)

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part02/idiom01.py

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+name = 'jackfrued'
+fruits = ['apple', 'orange', 'grape']
+owners = {'name': '骆昊', 'age': 40, 'gender': True}
+
+# if name != '' and len(fruits) > 0 and len(owners.keys()) > 0:
+#     print('Jackfrued love fruits.')
+
+if name and fruits and owners:
+    print('Jackfrued love fruits.')

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part02/idiom02.py

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+a, b = 5, 10
+
+# temp = a
+# a = b
+# b = a
+
+a, b = b, a
+print(f'a = {a}, b = {b}')

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part02/idiom03.py

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+chars = ['j', 'a', 'c', 'k', 'f', 'r', 'u', 'e', 'd']
+
+# name = ''
+# for char in chars:
+#     name += char
+
+name = ''.join(chars)
+print(name)

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part02/idiom04.py

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+fruits = ['orange', 'grape', 'pitaya', 'blueberry']
+
+# index = 0
+# for fruit in fruits:
+#     print(index, ':', fruit)
+#     index += 1
+
+for index, fruit in enumerate(fruits):
+    print(index, ':', fruit)

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part02/idiom05.py

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+data = [7, 20, 3, 15, 11]
+
+# result = []
+# for i in data:
+#     if i > 10:
+#         result.append(i * 3)
+
+result = [num * 3 for num in data if num > 10]
+print(result)

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/part02/idiom06.py

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+data = {'x': '5'}
+
+# if 'x' in data and isinstance(data['x'], (str, int, float)) \
+#         and data['x'].isdigit():
+#     value = int(data['x'])
+#     print(value)
+# else:
+#     value = None
+
+try:
+    value = int(data['x'])
+    print(value)
+except (KeyError, TypeError, ValueError):
+    value = None