python of scrapy POST form of FormRequest analog automatic landing

1, FormRequest form automatic landing

# -*- coding: utf-8 -*-
import scrapy


import re

class GithubSpider(scrapy.Spider):
    name = 'github'
    allowed_domains = ['github.com']
    start_urls = ['https://github.com/login']

    def parse(self, response):
        authenticity_token = response.xpath("//input[@name='authenticity_token']/@value").extract_first()
        utf8 = response.xpath("//input[@name='utf8']/@value").extract_first()
        commit = response.xpath("//input[@name='commit']/@value").extract_first()
        post_data = dict(
            login="812******[email protected]",
            password="******",
            authenticity_token=authenticity_token,
            utf8 = utf8,
            commit=commit,
        )
        # Form Request 
        yield scrapy.FormRequest (
             " https://github.com/session " ,
            formdata=post_data,
            callback=self.after_login
        )

    def after_login(self,response):
        # with open("a.html","w",encoding="utf-8") as f:
        #     f.write(response.body.decode())
        print(re.findall("812406210",response.body.decode()))

2, FormRequest.from_response analog automatic landing

# -*- coding: utf-8 -*-
import scrapy
import re
class Github2Spider(scrapy.Spider):
    name = 'github2'
    allowed_domains = ['github.com']
    start_urls = ['https://github.com/login']

    def parse(self, response):
        yield scrapy.FormRequest.from_response(
            response, # automatic response forms from looking from the 
            # FormData only need to pass the word typical login name and password, a dictionary key is input tag name attribute 
            FormData = { " the Login " : " ****@qq.com " , " password " : " *********** " },
            callback = self.after_login
        )

    def after_login(self,response):
        print(re.findall("........",response.body.decode()))

3, notes

　　a）FormRequest

　　

　　b) FormRequest.from_response