如何使用Django和Python清除一些警告消息

W: 11,0: String statement has no effect (pointless-string-statement)
C: 15,4: Missing method docstring (missing-docstring)
R: 15,4: Method could be a function (no-self-use)
W: 18,4: String statement has no effect (pointless-string-statement)
C: 19,4: Missing method docstring (missing-docstring)
E: 21,11: Instance of 'UserCreationForm' has no 'is_valid' member (no-member)
R: 19,4: Method could be a function (no-self-use)
C: 28,4: Missing method docstring (missing-docstring)
R: 28,4: Method could be a function (no-self-use)
W: 31,4: String statement has no effect (pointless-string-statement)
C: 32,4: Missing method docstring (missing-docstring)
E: 34,11: Instance of 'AuthenticationForm' has no 'is_valid' member (no-member)
R: 32,4: Method could be a function (no-self-use)
C: 38,0: Missing function docstring (missing-docstring)
W: 41,0: String statement has no effect (pointless-string-statement)
C: 43,0: Missing function docstring (missing-docstring)
C: 72,0: Missing function docstring (missing-docstring)
W: 75,0: String statement has no effect (pointless-string-statement)
C: 77,0: Missing function docstring (missing-docstring)
W: 98,0: String statement has no effect (pointless-string-statement)
C:100,0: Missing function docstring (missing-docstring)

我的python文件如下.

views.py:

""" coding: utf-8 """
from __future__ import unicode_literals
from django.shortcuts import render,redirect
from django.contrib.auth import login
from django.views.generic import View
from django.contrib.auth.forms import (UserCreationForm,AuthenticationForm)
from lxml import etree
import random
import xml.dom.minidom as m

""" this class is used for user signup """

class Signup(View):
    """ this function used to get the sign up form """
    def get(self,request):
        form = UserCreationForm()
        return render(request,'booking/signup.html',{'form': form})
    """ this function used for post the sign up data """
    def post(self,request):
        form = UserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('login')


class AuthLogin(View):
    """ this function used to get the login form """
    def get(self,request):
        form = AuthenticationForm()
        return render(request,'booking/login.html',{'form': form})
    """ this function used for post the login data """
    def post(self,request):
        form = AuthenticationForm(None,request.POST or None)
        if form.is_valid():
            login(request,form.get_user())
        return redirect('/')

def bmr(request):
    return render(request,'booking/bmr.html',{})

""" this function is used for save all the data """

def insert(request):
    if request.method == 'POST':
        location_name = request.POST.get('lname')
        rname = request.POST.get('rname')
        seat = request.POST.get('seat')
        projector = request.POST.get('projector')
        video = request.POST.get('video')
        num = str(random.randint(100000000000,999999999999))
        location_name = location_name[0:255]
        rname = rname[0:255]
        seat = seat[0:10]
        doc = m.parse("roomlist.xml")
        valeurs = doc.getElementsByTagName("roomlist")[0]
        element = doc.createElement("location")
        element.setAttribute("name",location_name)
        el1 = element.appendChild(doc.createElement("room"))
        el1.setAttribute("id",num)
        el2 = el1.appendChild(doc.createElement("roomname"))
        el2.appendChild(doc.createTextNode(rname))
        el3 = el1.appendChild(doc.createElement("noseats"))
        el3.appendChild(doc.createTextNode(seat))
        el4 = el1.appendChild(doc.createElement("projectorscreen"))
        el4.appendChild(doc.createTextNode(projector))
        el5 = el1.appendChild(doc.createElement("videoconf"))
        el5.appendChild(doc.createTextNode(video))
        valeurs.appendChild(element)
        doc.writexml(open("roomlist.xml","w"))
    return render(request,{})

def home(request):
    return render(request,'booking/home.html',{})

""" This function is used for disply all the data """

def view_book(request):
    doc = m.parse("roomlist.xml")
    staffs = doc.getElementsByTagName("location")
    root = []
    for staff in staffs:
        lname = staff.getAttribute("name")
        roomname = staff.getElementsByTagName(
            "roomname")[0].firstChild.nodeValue
        seat = staff.getElementsByTagName("noseats")[0].firstChild.nodeValue
        project = staff.getElementsByTagName(
            "projectorscreen")[0].firstChild.nodeValue
        video = staff.getElementsByTagName("videoconf")[0].firstChild.nodeValue
        root.append(
            {'lname': lname,'roomname': roomname,'seat': seat,'project': project,'video': video})
    return render(request,'booking/view_book.html',{'people': root})


""" This function is used to sear the data as per room name """

def search(request):
    per = []
    if request.method == 'POST':
        rname = request.POST.get('rname')
        tree = etree.parse('roomlist.xml')
        result = tree.xpath(".//roomname[text()=$rmname]/./..",rmname=rname)
        for user in result:
            per.append(
                {'roomname': user.find('roomname').text,'seat': user.find('noseats').text,'project': user.find('projectorscreen').text,'video': user.find('videoconf').text})
    return render(request,{'people': per})

在这里,我需要关闭最大警告消息,以便评级上升.请做必要的帮助.