Python使用库之标准库与第三方库实战指南

import datetime

import datetime

date1 = datetime.datetime(2012, 2, 14)
date2 = datetime.datetime(2022, 7, 12)

print(date2 - date1)

3801 days, 0:00:00

def reverse_words(s):
    tokens = s.split()
    tokens.reverse()
    return ' '.join(tokens)

print(reverse_words('I am a student.'))

def rotate_string(s, goal):
    return len(s) == len(goal) and goal in s + s

print(rotate_string('abcde', 'cdeab'))

def count_prefixes(words, s):
    res = 0
    for word in words:
        if s.startswith(word):
            res += 1
    return res

print(count_prefixes(["a", "b", "c", "ab", "bc", "abc"], "abc"))

import os

input_path = input("请输入待搜索路径：")
pattern = input("请输入待搜索关键词：")

for dirpath, dirnames, filenames in os.walk(input_path):
    for f in filenames:
        if pattern in f:
            print(f'{dirpath}/{f}')

pip install 库名

pip install qrcode[pil]

import qrcode

img = qrcode.make('我真帅')
img.save('qrcode.png')

pip install xlrd==1.2.0

import xlrd

xlsx = xlrd.open_workbook('d:/test.xlsx')
table = xlsx.sheet_by_index(0)
nrows = table.nrows

count = 0
total = 0
for i in range(1, nrows):
    class_id = table.cell_value(i, 1)
    if class_id == 101:
        total += table.cell_value(i, 2)
        count += 1

print(f'平均分：{total / count}')

pip install pynput==1.6.8
pip install playsound==1.2.2

from pynput import keyboard
from playsound import playsound

count = 0

def on_release(key):
    global count
    print(key)
    count += 1
    if count % 10 == 0:
        playsound('ding.mp3')

listener = keyboard.Listener(on_release=on_release)
listener.start()
listener.join()

from pynput import keyboard
from playsound import playsound
from threading import Thread

count = 0

def on_release(key):
    global count
    print(key)
    count += 1
    if count % 10 == 0:
        t = Thread(target=playsound, args=('ding.mp3',))
        t.start()

listener = keyboard.Listener(on_release=on_release)
listener.start()
listener.join()

import sys
import os

students = []

def menu():
    print("1. 新增学生信息")
    print("2. 显示所有同学信息")
    print("3. 根据名字查找学生信息")
    print("4. 删除学生信息")
    print("0. 退出程序")
    choice = input("请输入您的选择：")
    return int(choice)

def main():
    print("+----------------------------+")
    print("| 欢迎来到学生管理系统！     |")
    print("+----------------------------+")
    while True:
        choice = menu()
        if choice == 0:
            sys.exit()
        elif choice == 1:
            insert()
        elif choice == 2:
            show()
        elif choice == 3:
            find()
        elif choice == 4:
            delete()
        else:
            print("您的输入有误！请重新输入！")

if __name__ == '__main__':
    main()

def insert():
    print("[新增学生] 开始！")
    student_id = input("请输入学生的学号：")
    name = input("请输入学生的姓名：")
    gender = input("请输入学生的性别：")
    if gender not in ('男', '女'):
        print("性别不符合要求！新增学生失败！")
        return
    class_name = input("请输入学生的班级：")

    student = {
        'studentId': student_id,
        'name': name,
        'gender': gender,
        'className': class_name
    }
    global students
    students.append(student)
    save()
    print("[新增学生] 完毕！")

def show():
    print("[显示学生] 开始！")
    for s in students:
        print(f"{s['studentId']}\t{s['name']}\t{s['gender']}\t{s['className']}")
    print(f"[显示学生] 完毕！共显示了 {len(students)} 条记录！")

def find():
    print("[查找学生] 开始！")
    name = input("请输入要查找的同学姓名：")
    count = 0
    for s in students:
        if name == s['name']:
            print(f"{s['studentId']}\t{s['name']}\t{s['gender']}\t{s['className']}")
            count += 1
    print(f"[查找学生] 完毕！共查找到 {count} 条记录！")

def delete():
    print("[删除学生] 开始！")
    student_id = input("请输入要删除的同学学号：")
    count = 0
    for s in students:
        if student_id == s['studentId']:
            print(f"删除 {s['name']} 同学的信息！")
            students.remove(s)
            count += 1
    save()
    print(f"[删除学生] 完毕！共删除 {count} 条记录！")

def save():
    with open('d:/record.txt', 'w', encoding='utf8') as f:
        for s in students:
            f.write(f"{s['studentId']}\t{s['name']}\t{s['gender']}\t{s['className']}\n")
    print(f"[存档成功] 共存储了 {len(students)} 条记录！")

def load():
    if not os.path.exists('d:/record.txt'):
        return
    global students
    students = []
    with open('d:/record.txt', 'r', encoding='utf8') as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            parts = line.split('\t')
            student = {
                'studentId': parts[0],
                'name': parts[1],
                'gender': parts[2],
                'className': parts[3]
            }
            students.append(student)

pip install pyinstaller

pyinstaller -F 学生管理系统.py