Python程式設計核心技術與應用實踐

x = 5
if x > 10:
    print("x 大於 10")
else:
    print("x 小於或等於 10")

fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

def greet(name):
    print("Hello, " + name + "!")

greet("John")

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def greet(self):
        print("Hello, my name is " + self.name + " and I am " + str(self.age) + " years old.")

person = Person("John", 30)
person.greet()

person = Person("John", 30)
print(person.name)  # 輸出：John
print(person.age)   # 輸出：30

fruits = ["apple", "banana", "cherry"]
print(fruits[0])  # 輸出：apple

class Node:
    def __init__(self, value):
        self.value = value
        self.next = None

head = Node("apple")
head.next = Node("banana")
head.next.next = Node("cherry")
print(head.value)  # 輸出：apple

class Node:
    def __init__(self, value):
        self.value = value
        self.children = []

root = Node("root")
root.children.append(Node("child1"))
root.children.append(Node("child2"))
print(root.value)  # 輸出：root

CREATE TABLE users (
    id INT PRIMARY KEY,
    name VARCHAR(255),
    email VARCHAR(255)
);

INSERT INTO users (id, name, email) VALUES (1, "John", "john@example.com");

const db = require("mongodb").MongoClient;

db.connect("mongodb://localhost:27017/", function(err, client) {
    const db = client.db();
    const collection = db.collection("users");
    collection.insertOne({ name: "John", email: "john@example.com" });
});

import requests

response = requests.get("https://www.example.com")
print(response.text)

import ftplib

ftp = ftplib.FTP()
ftp.connect("ftp.example.com")
ftp.login("username", "password")
ftp.retrbinary("RETR file.txt", open("file.txt", "wb").write)

import paramiko

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect("example.com", username="username", password="password")
stdin, stdout, stderr = ssh.exec_command("ls -l")
print(stdout.read().decode())

# 使用 Playwright 的 click() 方法
from playwright.sync_api import Page
page = Page()
page.click("button")

# 使用 Selenium 的 click() 方法
from selenium import webdriver
driver = webdriver.Chrome()
driver.find_element_by_css_selector("button").click()

# 定義一個國家程式碼屬性
class Country:
    def __init__(self, country_code):
        self.country_code = country_code

# 定義一個等級屬性
class Level:
    def __init__(self, n_level):
        self.n_level = n_level

# 使用 split() 方法分割字串
my_string = "hello world"
words = my_string.split()
print(words)  # Output: ["hello", "world"]

# 使用 join() 方法合併字串
words = ["hello", "world"]
my_string = " ".join(words)
print(my_string)  # Output: "hello world"

# 使用 read() 方法讀取檔案
with open("example.txt", "r") as file:
    content = file.read()
print(content)

# 使用 write() 方法寫入檔案
with open("example.txt", "w") as file:
    file.write("Hello World!")

# 使用 get() 方法傳送 GET 請求
import requests
response = requests.get("https://www.example.com")
print(response.status_code)

# 使用 post() 方法傳送 POST 請求
import requests
response = requests.post("https://www.example.com", data={"key": "value"})
print(response.status_code)

import pyautogui

# 移動滑鼠到指定位置
pyautogui.moveTo(100, 100)

# 點選滑鼠
pyautogui.click()

# 輸入文字
pyautogui.typewrite('Hello World')

from selenium import webdriver

# 建立一個瀏覽器物件
driver = webdriver.Chrome()

# 開啟網頁
driver.get('https://www.google.com')

# 尋找元素
element = driver.find_element_by_name('q')

# 輸入文字
element.send_keys('Hello World')

# 點選按鈕
element.submit()

import subprocess

# 執行系統命令
subprocess.run(['ls', '-l'])

import json

# 建立一個json物件
data = {'name': 'John', 'age': 30}

# 將json物件轉換為字串
json_str = json.dumps(data)

# 將字串轉換為json物件
data2 = json.loads(json_str)

import os

# 取得當前工作目錄
current_dir = os.getcwd()

# 建立一個新目錄
os.mkdir('new_dir')

# 刪除一個目錄
os.rmdir('new_dir')

import matplotlib.pyplot as plt

# 繪製一條簡單的線圖
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y)
plt.show()

# 將整數轉換為字串
num = 123
str_num = str(num)
print(str_num)  # 輸出：123

# 取得字串的長度
str_len = len(str_num)
print(str_len)  # 輸出：3

# 分割字串
str_split = str_num.split('1')
print(str_split)  # 輸出：['2', '23']

# 合併字串
str_join = '-'.join(['a', 'b', 'c'])
print(str_join)  # 輸出：a-b-c

# 建立清單
my_list = [1, 2, 3]

# 在清單末尾新增元素
my_list.append(4)
print(my_list)  # 輸出：[1, 2, 3, 4]

# 在清單指定位置新增元素
my_list.insert(1, 10)
print(my_list)  # 輸出：[1, 10, 2, 3, 4]

# 從清單中刪除元素
my_list.remove(10)
print(my_list)  # 輸出：[1, 2, 3, 4]

# 對清單進行排序
my_list.sort()
print(my_list)  # 輸出：[1, 2, 3, 4]

# 建立字典
my_dict = {'a': 1, 'b': 2, 'c': 3}

# 取得字典的所有鍵
keys = my_dict.keys()
print(keys)  # 輸出：dict_keys(['a', 'b', 'c'])

# 取得字典的所有值
values = my_dict.values()
print(values)  # 輸出：dict_values([1, 2, 3])

# 取得字典的所有鍵值對
items = my_dict.items()
print(items)  # 輸出：dict_items([('a', 1), ('b', 2), ('c', 3)])

# 取得字典中指定鍵的值
value = my_dict.get('a')
print(value)  # 輸出：1

# 開啟檔案
file = open('example.txt', 'r')

# 讀取檔案內容
content = file.read()
print(content)

# 關閉檔案
file.close()

# 開啟檔案
file = open('example.txt', 'w')

# 寫入檔案內容
file.write('Hello World!')

# 關閉檔案
file.close()

import csv

# 讀取CSV檔案
with open('example.csv', 'r') as file:
    reader = csv.reader(file)
    for row in reader:
        print(row)

# 寫入CSV檔案
with open('example.csv', 'w') as file:
    writer = csv.writer(file)
    writer.writerow(['Name', 'Age'])
    writer.writerow(['John', 25])

from PIL import Image

# 開啟圖片
img = Image.open('example.jpg')

# 儲存圖片
img.save('example.png')

# 調整圖片大小
img = img.resize((800, 600))

from selenium import webdriver

# 建立瀏覽器物件
driver = webdriver.Chrome()

# 開啟網頁
driver.get('https://www.google.com')

# 查詢網頁元素
element = driver.find_element_by_name('q')

# 關閉瀏覽器
driver.quit()