爬虫发送带headers报错内容为ValueError: too many values to unpack (expected 2)

本文介绍了一段Python爬虫代码中的错误及其修正方法。主要问题是请求头(headers)的定义不正确,导致了ValueError异常。通过调整headers字典结构,成功解决了爬虫无法正常运行的问题。

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这个是我报错的代码:
author = ‘li lee’
import requests
#变量url接收访问地址
url = ‘http://www.baidu.com
#加headers(将浏览器的用户代理,写到headers中)
#用于重置User-Agent(之前是request)伪装成浏览器
headers = {
‘Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0’
}
#发送请求获取响应,将请求头作为参数传进get请求中
response = requests.get(url,headers)
response.encoding=‘utf-8’
print(response.status_code)
print(response.content)

报错信息:
File “E:/PY_Study/第一阶段/爬虫/day22/西祠代理.py”, line 11, in
response = requests.get(url,headers)
ValueError: too many values to unpack (expected 2)

解决详细:
请求头headers是一个字典,那么字典里面就有对应的键和值,从上面代码中,可以看出,我直接将User-Agent放到headers中,那么上面的报错信息就是字典定义的错误
正确代码:
headers = {
‘User-Agent’:‘Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0’
}

702 INFO: Appending 'binaries' from .spec Traceback (most recent call last): File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\lib\runpy.py", line 196, in _run_module_as_main return _run_code(code, main_globals, None, File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\lib\runpy.py", line 86, in _run_code exec(code, run_globals) File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\Scripts\pyinstaller.exe\__main__.py", line 7, in <module> File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\lib\site-packages\PyInstaller\__main__.py", line 231, in _console_script_run run() File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\lib\site-packages\PyInstaller\__main__.py", line 215, in run run_build(pyi_config, spec_file, **vars(args)) File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\lib\site-packages\PyInstaller\__main__.py", line 70, in run_build PyInstaller.building.build_main.main(pyi_config, spec_file, **kwargs) File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\lib\site-packages\PyInstaller\building\build_main.py", line 1270, in main build(specfile, distpath, workpath, clean_build) File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\lib\site-packages\PyInstaller\building\build_main.py", line 1208, in build exec(code, spec_namespace) File "update_status.spec", line 7, in <module> a = Analysis( File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\lib\site-packages\PyInstaller\building\build_main.py", line 573, in __init__ for dest_name, src_name in format_binaries_and_datas(binaries, workingdir=spec_dir)] File "C:\ProgramData\Anaconda3\envs\DRBAutoReport\lib\site-packages\PyInstaller\building\utils.py", line 457, in format_binaries_and_datas for src_root_path_or_glob, trg_root_dir in binaries_or_datas: ValueError: too many values to unpack (expected 2)
03-25
Traceback (most recent call last): File "C:\Users\asus\PycharmProjects\祁晓冬2\pythonProject2\main.py", line 153, in <module> get_data() File "C:\Users\asus\PycharmProjects\祁晓冬2\pythonProject2\main.py", line 18, in get_data json_data = requests.get(url, headers) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\asus\PycharmProjects\祁晓冬2\pythonProject2\venv\Lib\site-packages\requests\api.py", line 74, in get return request("get", url, params=params, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\asus\PycharmProjects\祁晓冬2\pythonProject2\venv\Lib\site-packages\requests\api.py", line 60, in request return session.request(method=method, url=url, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\asus\PycharmProjects\祁晓冬2\pythonProject2\venv\Lib\site-packages\requests\sessions.py", line 577, in request prep = self.prepare_request(req) ^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\asus\PycharmProjects\祁晓冬2\pythonProject2\venv\Lib\site-packages\requests\sessions.py", line 487, in prepare_request p.prepare( File "C:\Users\asus\PycharmProjects\祁晓冬2\pythonProject2\venv\Lib\site-packages\requests\models.py", line 370, in prepare self.prepare_url(url, params) File "C:\Users\asus\PycharmProjects\祁晓冬2\pythonProject2\venv\Lib\site-packages\requests\models.py", line 477, in prepare_url enc_params = self._encode_params(params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\asus\PycharmProjects\祁晓冬2\pythonProject2\venv\Lib\site-packages\requests\models.py", line 122, in _encode_params for k, vs in to_key_val_list(data): ^^^^^ ValueError: too many values to unpack (expected 2)
06-08
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