在Google App Engine中使用pdfkit生成PDF引发了Popen的AttributeError

Question

我正尝试在Flask中使用pdfkit生成PDF。 pdfkit在本地工作正常，但是当我在Google App Engine中使用它时，会引发以下错误。

Traceback (most recent call last): 
    File "C:\Python27\flaskapp\flask\app.py", line 1687, in wsgi_app 
    response = self.full_dispatch_request() 
    File "C:\Python27\flaskapp\flask\app.py", line 1360, in full_dispatch_request 
    rv = self.handle_user_exception(e) 
    File "C:\Python27\flaskapp\flask\app.py", line 1358, in full_dispatch_request 
    rv = self.dispatch_request() 
    File "C:\Python27\flaskapp\flask\app.py", line 1344, in dispatch_request 
    return self.view_functions[rule.endpoint](**req.view_args) 
    File "C:\Python27\flaskapp\main.py", line 17, in yout 
    pdf = pdfkit.from_string(my_string,False , configuration=config) 
    File "C:\Python27\flaskapp\pdfkit\api.py", line 68, in from_string 
    return r.to_pdf(output_path) 
    File "C:\Python27\flaskapp\pdfkit\pdfkit.py", line 92, in to_pdf 
    result = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, 
AttributeError: 'module' object has no attribute 'Popen' 

from flask import Flask, make_response, request, render_template 
import pdfkit 

path_wkthmltopdf = r'C:\Python27\flaskapp\wkhtmltopdf\bin\wkhtmltopdf.exe' 

config = pdfkit.configuration(wkhtmltopdf=path_wkthmltopdf) 
app = Flask(__name__) 

@app.route('/pdf', methods=['POST', 'GET']) 
def pdf(): 
    if request.method == 'POST': 
     my_string = request.form['text11'] 
     pdf = pdfkit.from_string(my_string, False, configuration=config) 

     response = make_response(pdf) 
     response.headers['Content-Type'] = 'application/pdf' 
     response.headers['Content-Disposition'] = 'inline; filename=out.pdf' 

     return response 

    return render_template('pdff.html') 

Answer 1

该代码将无法在谷歌应用程序引擎运行，因为App Engine的Python runtime environment不允许subprocess.Popen或启动另一个进程的任何其他呼叫电话。