learning.py · 廖雪峰的Python3.x教程

``` #!/usr/bin/env python3 # -*- coding: utf-8 -*- r''' learning.py A Python 3 tutorial from http://www.liaoxuefeng.com Usage: python3 learning.py ''' import sys def check_version(): v = sys.version_info if v.major == 3 and v.minor >= 4: return True print('Your current python is %d.%d. Please use Python 3.4.' % (v.major, v.minor)) return False if not check_version(): exit(1) import os, io, json, subprocess, tempfile from urllib import parse from wsgiref.simple_server import make_server EXEC = sys.executable PORT = 39093 HOST = 'local.liaoxuefeng.com:%d' % PORT TEMP = tempfile.mkdtemp(suffix='_py', prefix='learn_python_') INDEX = 0 def main(): httpd = make_server('127.0.0.1', PORT, application) print('Ready for Python code on port %d...' % PORT) httpd.serve_forever() 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') def application(environ, start_response): host = environ.get('HTTP_HOST') method = environ.get('REQUEST_METHOD') path = environ.get('PATH_INFO') if method == 'GET' and path == '/': start_response('200 OK', [('Content-Type', 'text/html')]) return [b'<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>'] if method == 'GET' and path == '/env': start_response('200 OK', [('Content-Type', 'text/html')]) L = [b'<html><head><title>ENV</title></head><body>'] for k, v in environ.items(): p = '<p>%s = %s' % (k, str(v)) L.append(p.encode('utf-8')) L.append(b'</html>') return L if host != HOST or method != 'POST' or path != '/run' or not environ.get('CONTENT_TYPE', '').lower().startswith('application/x-www-form-urlencoded'): start_response('400 Bad Request', [('Content-Type', 'application/json')]) return [b'{"error":"bad_request"}'] s = environ['wsgi.input'].read(int(environ['CONTENT_LENGTH'])) qs = parse.parse_qs(s.decode('utf-8')) if not 'code' in qs: start_response('400 Bad Request', [('Content-Type', 'application/json')]) return [b'{"error":"invalid_params"}'] name = qs['name'][0] if 'name' in qs else get_name() code = qs['code'][0] headers = [('Content-Type', 'application/json')] origin = environ.get('HTTP_ORIGIN', '') if origin.find('.liaoxuefeng.com') == -1: start_response('400 Bad Request', [('Content-Type', 'application/json')]) return [b'{"error":"invalid_origin"}'] headers.append(('Access-Control-Allow-Origin', origin)) start_response('200 OK', headers) r = dict() try: fpath = write_py(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.') return [json.dumps(r).encode('utf-8')] if __name__ == '__main__': main() ```