在廖雪峰大神的网站下学习了Python，其中有一个提供互动环境的Python脚本--learning.py，报了个错，看了下源文件的代码，安排了一下。

报错信息：

This learning.py is expired. Please download a newer version.

解决方法：

用任意编辑器打开learnin.py源文件，会发现在文件顶部有以下代码：

CERT_EXPIRES = '2018-07-01'

def check_version():

    v = sys.version_info

    if v.major == 3 and v.minor >= 5:

        return

    print('Your current python is %d.%d. Please use Python 3.6.' % (v.major, v.minor))

    exit(1)

def check_cert():

    today = datetime.now().strftime('%Y-%m-%d')

    if today >= CERT_EXPIRES:

        print('This learning.py is expired. Please download a newer version.')

        exit(1)

显然，其中CERT_EXPIRES变量声明了一个日期，而在下文中用当前日期与其做了比较，如果当前日期大于CERT_EXPIRES，则会报错：

print('This learning.py is expired. Please download a newer version.')

所以解决方法就很简单：

将CERT_EXPIRES设置的时间比现在大即可，比如

CERT_EXPIRES = '2018-09-01'

源码

#!/usr/bin/env python3

# -*- coding: utf-8 -*-

r'''

learning.py

A Python 3 tutorial from https://www.liaoxuefeng.com

Usage:

python3 learning.py

'''

# check #######################################################################

import sys

from datetime import datetime

CERT_EXPIRES = '2018-09-01'

def check_version():

    v = sys.version_info

    if v.major == 3 and v.minor >= 5:

        return

    print('Your current python is %d.%d. Please use Python 3.6.' % (v.major, v.minor))

    exit(1)

def check_cert():

    today = datetime.now().strftime('%Y-%m-%d')

    if today >= CERT_EXPIRES:

        print('This learning.py is expired. Please download a newer version.')

        exit(1)

check_version()

check_cert()

# start server ################################################################

import os, io, json, subprocess, tempfile, ssl

from urllib import parse

from http.server import HTTPServer, BaseHTTPRequestHandler, SimpleHTTPRequestHandler

EXEC = sys.executable

PORT = 39093

TEMP = tempfile.mkdtemp(suffix='_py', prefix='learn_python_')

HTML_INDEX = r'''

<html>

  <head><title>Learning Python</title></head>

  <body>

    <form method="post" action="/run">

      <textarea name="code" style="width:90%;height: 600px"></textarea>

      <p><button type="submit">Run</button></p>

    </form>

  </body>

</html>

'''

class LearningHTTPRequestHandler(BaseHTTPRequestHandler):

    def do_GET(self):

        self.close_connection = True

        if self.path != '/':

            return self.send_error(404)

        self._sendHttpHeader('text/html')

        self._sendHttpBody(HTML_INDEX)

    def do_POST(self):

        self.close_connection = True

        if self.path != '/run':

            return self.send_error(400)

        print('Prepare code...')

        body = self.rfile.read(int(self.headers['Content-length']))

        qs = parse.parse_qs(body.decode('utf-8'))

        if not 'code' in qs:

            return self.send_error(400)

        code = qs['code'][0]

        r = dict()

        try:

            fpath = write_py(get_name(), code)

            print('Execute: %s %s' % (EXEC, fpath))

            r['output'] = decode(subprocess.check_output([EXEC, fpath], stderr=subprocess.STDOUT, timeout=5))

        except subprocess.CalledProcessError as e:

            r = dict(error='Exception', output=decode(e.output))

        except subprocess.TimeoutExpired as e:

            r = dict(error='Timeout', output='执行超时')

        except subprocess.CalledProcessError as e:

            r = dict(error='Error', output='执行错误')

        print('Execute done.')

        self._sendHttpHeader()

        self._sendHttpBody(r)

    def _sendHttpHeader(self, contentType='application/json'):

        origin = self.headers['Origin'] or 'https://www.liaoxuefeng.com'

        self.send_response(200)

        self.send_header('Content-Type', contentType)

        self.send_header('Access-Control-Allow-Origin', origin)

        self.send_header('Access-Control-Allow-Methods', 'GET,POST')

        self.send_header('Access-Control-Max-Age', '86400')

        self.end_headers()

    def _sendHttpBody(self, data):

        body = b''

        if isinstance(data, bytes):

            body = data

        elif isinstance(data, str):

            body = data.encode('utf-8', errors='ignore')

        else:

            body = json.dumps(data).encode('utf-8', errors='ignore')

        self.wfile.write(body)

def main():

    certfile = write_cert()

    httpd = HTTPServer(('127.0.0.1', PORT), LearningHTTPRequestHandler)

    httpd.socket = ssl.wrap_socket(httpd.socket, certfile=certfile, server_side=True)

    print('Ready for Python code on port %d...' % PORT)

    print('Press Ctrl + C to exit...')

    httpd.serve_forever()

# functions ###################################################################

INDEX = 0

def get_name():

    global INDEX

    INDEX = INDEX + 1

    return 'test_%d' % INDEX

def write_py(name, code):

    fpath = os.path.join(TEMP, '%s.py' % name)

    with open(fpath, 'w', encoding='utf-8') as f:

        f.write(code)

    print('Code wrote to: %s' % fpath)

    return fpath

def decode(s):

    try:

        return s.decode('utf-8')

    except UnicodeDecodeError:

        return s.decode('gbk')

# certificate #################################################################

def write_cert():

    fpath = os.path.join(TEMP, 'local.liaoxuefeng.com.pem')

    with open(fpath, 'w', encoding='utf-8') as f:

        f.write(CERT_DATA)

    return fpath

CERT_DATA = r'''

-----BEGIN RSA PRIVATE KEY-----

MIIEpAIBAAKCAQEA5b3zv77bzN8JShoXkVjXFG9NK342wnfgye+NmuSoRfCMPrwL

GToJZiwxokXGyVY8obmQA69WUgonpuotp0AhDK8bOvykKuX+7MyE36sh9TUVOiIw

6D3ODG2E1K5IIEytfGhuPmeJe3OapnL/lJytlLhonu63VEf+jpYh6I/gXD4hZu1N

tx4rOeJLl3qSFgRgX4oBZtO0d4aHop/XW5XcdaeuJxIW5qw7PxXqlch4h9TUs0Og

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YePMDifbgHDXrCeBeb7TypefD/ScxdVJdI9sPSno20AehzDkXcAssQ==

-----END RSA PRIVATE KEY-----

-----BEGIN CERTIFICATE-----

MIIFzTCCBLWgAwIBAgIQB594sjWBo6qup5zlKa2F7zANBgkqhkiG9w0BAQsFADCB

lzELMAkGA1UEBhMCQ04xJTAjBgNVBAoTHFRydXN0QXNpYSBUZWNobm9sb2dpZXMs

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PQIZzWhji6209MG5hg/RN3Zo9uoz2GodNWwOSkvcFVUz9oBExLfcfhZAsBz26dgs

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fdilj1tXNa5eDtSRplqbFB+kPGkP/NZ5b1+huarDqE/aeNpmREqONhxi49KB1/9u

1w==

-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----

MIIFZTCCBE2gAwIBAgIQOhAOfxCeGsWcxf/2QNXkQjANBgkqhkiG9w0BAQsFADCB

yjELMAkGA1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMR8wHQYDVQQL

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1lFUM0yoTzwwFsPu3Pk+94hL58ErqwqJQwxoHMgLIQeMVHeNKcWFy1bddSbIbCWU

Zs6cMxhrra062ZCpDCbxyEaFNGAtYQMqNz55Z/14XgSUONZ/cJTns6QKhpcgTOwB

fnNzRnk+aWreP7osKhXlz4zs+llP7goBDKFOMMtoEXx3YjJCKgpqmBU=

-----END CERTIFICATE-----

'''

# start main at last ##########################################################

if __name__ == '__main__':

    main()

   

   

   

友情链接:

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