编写下面这段需求的python自动化接口测试用例。需求说明: 1.手机号输入，限制只能输入数字且手机号限制输入11位，除数字外字符输入弹出提升“输入错误”；2.点击发送验证码，向服务端发起获取验证码请求，并且客户端提示”验证码已发送"；3.用户密码输入，只能输入数字或字母，限制位数为8-16位；4.点击注册提交数据，5.用户协议默认选中，用户点击“隐私协议或“用户协议”跳转至对应协议页面;6.点击“直接登录”跳转至登录弹框; 7.当用户点击"X”按钮，关闭注册弹框

以下是一个示例自动化接口测试用例的代码：

import requests

# 测试手机号输入
def test_phone_number_input():
    # 输入正确的手机号
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "12345678901"})
    assert response.status_code == 200
    assert response.text == "验证码已发送"
    
    # 输入错误的手机号（包含非数字字符）
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "1234567890a"})
    assert response.status_code == 400
    assert response.text == "输入错误"
    
    # 输入错误的手机号（长度不足11位）
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "1234567890"})
    assert response.status_code == 400
    assert response.text == "输入错误"
    
    # 输入错误的手机号（长度超过11位）
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "123456789012"})
    assert response.status_code == 400
    assert response.text == "输入错误"

# 测试获取验证码
def test_send_verification_code():
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "12345678901"})
    assert response.status_code == 200
    assert response.text == "验证码已发送"

# 测试密码输入
def test_password_input():
    # 输入正确的密码
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "12345678901", "password": "password"})
    assert response.status_code == 200
    
    # 输入错误的密码（包含非数字或字母字符）
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "12345678901", "password": "password!"})
    assert response.status_code == 400
    
    # 输入错误的密码（长度不足8位）
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "12345678901", "password": "pass"})
    assert response.status_code == 400
    
    # 输入错误的密码（长度超过16位）
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "12345678901", "password": "passwordpassword"})
    assert response.status_code == 400

# 测试注册
def test_registration():
    # 提交正确的数据
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "12345678901", "password": "password", "agree_to_terms": "true"})
    assert response.status_code == 200
    
    # 提交错误的数据（未同意用户协议）
    response = requests.post(url="http://localhost:8000/register", data={"phone_number": "12345678901", "password": "password", "agree_to_terms": "false"})
    assert response.status_code == 400

# 测试用户协议
def test_terms_of_service():
    # 点击用户协议，跳转至协议页面
    response = requests.get(url="http://localhost:8000/terms-of-service")
    assert response.status_code == 200
    assert "用户协议" in response.text
    
    # 点击隐私协议，跳转至协议页面
    response = requests.get(url="http://localhost:8000/privacy-policy")
    assert response.status_code == 200
    assert "隐私协议" in response.text

# 测试登录
def test_login():
    # 点击直接登录，跳转至登录弹框
    response = requests.get(url="http://localhost:8000/login")
    assert response.status_code == 200
    assert "登录" in response.text

# 测试关闭注册弹框
def test_close_registration():
    # 点击关闭按钮，关闭注册弹框
    response = requests.post(url="http://localhost:8000/close-registration")
    assert response.status_code == 200

需要注意的是，以上代码仅为示例，实际测试用例需要根据具体需求进行编写。