写一个python的HTML订单管理页面。这个页面有一个表格，表格每列标题依次是项目编号、 任务名、客户联系方式、技术联系方式、预算、单价、订单号、状态、时间1，表格默认显示20行。表格下方有个分页功能，这个功能包括最左边有首页上一页，中间就是阿拉伯数字的页码，页码显示前2个和后2个中间用省略号，页码后面有下一页、末页，最后是一个输入框。分页功能中，点击首页，页码跳到1、点击上一页页码跳到当前页减1，点击下一页码跳到当前页加1，点击末页页码跳到最后页。输入框里输入页码，当前页显示该页码。表格的内容总是显示当前页码的数据，默认显示第一页

好的，这是一个简单的Python Flask实现的HTML订单管理页面，满足您的需求：

from flask import Flask, render_template, request

app = Flask(__name__)

# Mock data
orders = [
    {"proj_id": "P001", "task_name": "Task 1", "client_contact": "client1@example.com", "tech_contact": "tech1@example.com", "budget": 1000, "price": 100, "order_no": "O001", "status": "Pending", "time1": "2022-01-01"},
    {"proj_id": "P002", "task_name": "Task 2", "client_contact": "client2@example.com", "tech_contact": "tech2@example.com", "budget": 2000, "price": 200, "order_no": "O002", "status": "In Progress", "time1": "2022-01-02"},
    {"proj_id": "P003", "task_name": "Task 3", "client_contact": "client3@example.com", "tech_contact": "tech3@example.com", "budget": 3000, "price": 300, "order_no": "O003", "status": "Completed", "time1": "2022-01-03"},
    # ...More orders
]

# Constants
ROWS_PER_PAGE = 20


@app.route("/", methods=["GET", "POST"])
def index():
    # Get current page number from query string parameter
    page = int(request.args.get("page", 1))

    # Calculate start and end index of orders for current page
    start_idx = (page - 1) * ROWS_PER_PAGE
    end_idx = start_idx + ROWS_PER_PAGE

    # Get orders for current page
    current_orders = orders[start_idx:end_idx]

    # Calculate total number of pages
    total_pages = (len(orders) - 1) // ROWS_PER_PAGE + 1

    # Calculate page numbers to display in pagination
    page_numbers = []
    for i in range(max(1, page - 2), min(total_pages + 1, page + 3)):
        page_numbers.append(i)

    # Insert ellipses in page numbers if there are gaps
    if page_numbers[1] > 2:
        page_numbers.insert(1, "...")
    if page_numbers[-2] < total_pages - 1:
        page_numbers.insert(-1, "...")

    # Render HTML template with data
    return render_template(
        "index.html",
        current_orders=current_orders,
        page_numbers=page_numbers,
        current_page=page,
        total_pages=total_pages,
    )


if __name__ == "__main__":
    app.run(debug=True)

注意，这只是一个简单的示例，没有使用数据库或其他实际数据存储。您需要根据您的实际需求进行更改和扩展。