综合项目与阶段毕业

import requests
from bs4 import BeautifulSoup

headers = {"User-Agent": "Mozilla/5.0"}    # 礼貌地报上身份
resp = requests.get(url, headers=headers, timeout=10)
resp.encoding = "utf-8"
soup = BeautifulSoup(resp.text, "html.parser")
for tag in soup.select(".weather"):        # CSS 选择器定位
    print(tag.get_text(strip=True))

import requests, csv, time
headers = {"User-Agent": "Mozilla/5.0"}
rows = []
for page in range(0, 2):                  # 翻页：start=0,25,50…
    url = "https://movie.example/top250"
    r = requests.get(url, params={"start": page * 25}, headers=headers, timeout=5)
    print(f"第{page+1}页 状态码 {r.status_code}，长度 {len(r.text)}")
    time.sleep(1)                         # 礼貌限速，别把服务器打挂
    rows.append(["肖申克的救赎", 9.7])
with open("top250.csv", "w", newline="", encoding="utf-8") as f:
    csv.writer(f).writerows(rows)         # 存成 CSV

import re
text = "联系我: xiaoqiang@py.com 或 teacher@school.cn"
emails = re.findall(r"[\w.]+@[\w.]+", text)
print("找到邮箱：", emails)
phones = re.findall(r"1\d{10}", "电话13812345678")
print("找到手机：", phones)

import threading

def download(name):
    print(f"开始下载 {name} ……")
    # ……下载代码……
    print(f"{name} 完成！")

ts = []
for i in range(3):                       # 开 3 条线程
    t = threading.Thread(target=download, args=(f"图{i}.png",))
    t.start(); ts.append(t)
for t in ts: t.join()                    # 等全部完成

import tkinter as tk
win = tk.Tk()
win.title("我的记事本")
win.geometry("400x300")
txt = tk.Text(win, font=("simhei", 12))
txt.pack(fill="both", expand=True)
btn = tk.Button(win, text="保存",
                command=lambda: print("已保存", len(txt.get("1.0", "end")), "字符"))
btn.pack()
# win.mainloop()   # 事件循环：程序的心跳
print("窗口、文本框、按钮三件套已就绪")

import sqlite3
conn = sqlite3.connect("library.db")
cur = conn.cursor()
cur.execute("""CREATE TABLE IF NOT EXISTS book(
    id INTEGER PRIMARY KEY,
    name TEXT, price REAL)""")
cur.execute("INSERT INTO book(name, price) VALUES(?, ?)", ("Python入门", 59.0))
conn.commit()
for row in cur.execute("SELECT name, price FROM book WHERE price > 50"):
    print(row)

# 方法一：print 大法（快速但不优雅）
# 方法二：breakpoint() 进交互式调试
#   n = 下一行 / p 变量 = 打印 / c = 继续跑
# 方法三：单元测试，把 Bug 锁死
def divide(a, b):
    return a / b                    # 藏着 b=0 的雷

import unittest
class TestDivide(unittest.TestCase):
    def test_zero(self):
        with self.assertRaises(ZeroDivisionError):
            divide(1, 0)
print("用例设计：正常值 / 边界值 / 异常值")

# PEP8 核心四条，写代码像写字一样工整
import os,sys            # ✗ 一行多个 import
import os
import sys               # ✓ 每个 import 独立一行

def f( a,b ):            # ✗ 括号里贴太紧
    x=1                   # ✗ 等号两边没空格
    return x

def add(a, b):           # ✓ 逗号后空格、运算符两侧空格
    total = a + b        # ✓ snake_case 命名、小写函数名
    return total         # ✓ 4 空格缩进
print("可读性 > 聪明，代码是写给人看的")