python在各领域的应用的代码示例

from flask import Flask
app = Flask(__name__)
@app.route('/')def hello_world():    return 'Hello, World! This is a simple Flask web app.'
if __name__ == '__main__':    app.run()

import pandas as pd
data = pd.read_csv('your_data.csv')
# 查看数据的前几行print(data.head())
# 计算某一列的平均值column_mean = data['column_name'].mean()print(f"The mean of the column is {column_mean}")

from sklearn.linear_model import LinearRegressionimport numpy as np
# 生成一些随机数据X = np.array([1, 2, 3, 4, 5]).reshape(-1, 1)y = np.array([2, 4, 5, 4, 6])
# 创建线性回归模型model = LinearRegression()
# 训练模型model.fit(X, y)
# 预测新数据new_X = np.array([6]).reshape(-1, 1)prediction = model.predict(new_X)print(f"Prediction for new data: {prediction}")

import os
folder_path = 'your_folder_path'
for filename in os.listdir(folder_path):    if filename.endswith('.old_extension'):        new_filename = filename.replace('.old_extension', '.new_extension')        os.rename(os.path.join(folder_path, filename), os.path.join(folder_path, new_filename))

import pygame
# 初始化 Pygamepygame.init()
# 设置屏幕尺寸screen_width = 800screen_height = 600screen = pygame.display.set_mode((screen_width, screen_height))
# 设置方块的初始位置和速度block_x = 400block_y = 300block_speed = 5
# 游戏循环running = Truewhile running:    for event in pygame.event.get():        if event.type == pygame.QUIT:            running = False
    keys = pygame.key.get_pressed()    if keys[pygame.K_LEFT]:        block_x -= block_speed    if keys[pygame.K_RIGHT]:        block_x += block_speed    if keys[pygame.K_UP]:        block_y -= block_speed    if keys[pygame.K_DOWN]:        block_y += block_speed
    # 绘制屏幕和方块    screen.fill((0, 0, 0))    pygame.draw.rect(screen, (255, 0, 0), (block_x, block_y, 50, 50))    pygame.display.flip()
# 退出 Pygamepygame.quit()