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="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
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YePMDifbgHDXrCeBeb7TypefD/ScxdVJdI9sPSno20AehzDkXcAssQ==
-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
MIIFzTCCBLWgAwIBAgIQB594sjWBo6qup5zlKa2F7zANBgkqhkiG9w0BAQsFADCB
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1w==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
'''
# start main at last ##########################################################
if __name__ == '__main__':
main()
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