外文分享

问题 I am trying to incorporate radio buttons in my form. In my forms.py I have the following fields for the form : class ProfileForm(forms.ModelForm): class Meta: model = Profile fields = ['first_name', 'last_name', 'gender'] In my models.py : user = models.ForeignKey(User, db_column='user_id') first_name = models.CharField(max_length=250) last_name = models.CharField(max_length=250 GENDER = (('M', 'Male'), ('F', 'Female'), ('O', 'Other')) gender = models.CharField(max_length=1, choices=GENDER,

问题 When sleeping for a long time (like running time.sleep(3**3**3) ) in Python 3, the program returns an OverflowError with the error message "timestamp too large to convert to C _PyTime_t". What is the largest time length I can sleep? 回答1: The value should be 9223372036.854775, which is "is the maximum value for a 64-bit signed integer in computing". See this Wikipedia article. Mentioning of _PyTime_t in PEP 564: The CPython private "pytime" C API handling time now uses a new _PyTime_t type:

问题 When sleeping for a long time (like running time.sleep(3**3**3) ) in Python 3, the program returns an OverflowError with the error message "timestamp too large to convert to C _PyTime_t". What is the largest time length I can sleep? 回答1: The value should be 9223372036.854775, which is "is the maximum value for a 64-bit signed integer in computing". See this Wikipedia article. Mentioning of _PyTime_t in PEP 564: The CPython private "pytime" C API handling time now uses a new _PyTime_t type:

问题 This question already has answers here : Syntax error in IE using ES6 arrow functions (2 answers) Closed 3 years ago . I have the following line of javascript code var res = Object.keys(packages).filter(e => packages[e] === true) The above works well in all the other browser apart from IE. IE complains about Syntax erro at => can someone tell me how to get around this in IE 回答1: IE must not support arrow-functions. Just use the old function keyword. .filter(function(e){ return packages[e] ===

问题 To get a single document in Fauna we do: q.Get(q.Ref(q.Collection('posts'), '192903209792046592')) And we get something like: { data: { title: 'Lorem ipsum', authorId: '892943607792046595' } } Is it possible to instead get the post and the author in the same query? Something like this: { data: { title: 'Lorem ipsum', author: { name: 'John Doe' } } } 回答1: Since this is a common question I'm going to expand it and give you all info that you should need to get started. I recently wrote an

问题 I would like to select records and determine rank number for each similar data. My data is as follows. MEMBER ID | LOAN AMOUNT 1 | 2,000.00 2 | 1,000.00 3 | 4,000.00 4 | 1,000.00 The result I wanted is shown below. RANK|MEMBER ID|LOAN AMOUNT 1 |3 |4,000.00 2 |1 |2,000.00 3 |2 |1,000.00 3 |4 |1,000.00 RANK is a new column. I am using MS SQL server 2008 and created a view table as shown below but it does not resulting to what is wanted. select rank=count(*), s1.MemberID, s1.Loan_Amount from

问题 My code is import SpeechRecognition as sr # obtain audio from the microphone r = sr.Recognizer() with sr.Microphone() as source: print("Say something!") audio = r.listen(source) # recognize speech using Microsoft Bing Voice Recognition BING_KEY = "Somevalue" # Microsoft Bing Voice Recognition API keys 32-character lowercase hexadecimal strings try: print("Microsoft Bing Voice Recognition thinks you said " + r.recognize_bing(audio, key=BING_KEY)) except sr.UnknownValueError: print("Microsoft

问题 How display a NSVisualEffectView with with rounded corners in OS X? My code to add my NSVisualEffectView: let visualEffectView = NSVisualEffectView(frame: NSMakeRect(0, 0, 300, 300)) visualEffectView.material = NSVisualEffectMaterial.Dark visualEffectView.blendingMode = NSVisualEffectBlendingMode.BehindWindow self.addSubview(visualEffectView) 回答1: You can enable layer backed views for your NSVisualEffectView by setting wantsLayer to true and then set the cornerRadius of the backing layer: let

问题 I have an XML file like this: <Something>....</Something> <Another>....</Another> <Other>...</Other> This XML file does not have a root element (I know that this is a wrong XML format). I need to create or replace (if it already exists) a node in this XML, but I can't work with XDocument or XmlDocument because they need a root element to work, and I can't add a root element to this XML because I can't change more code in the Application (Windows forms application). What are my options to

问题 I am trying to run visualvm in my Windows 8 machine and i am getting error 'Local java applications cannot be detected'. I tried to follow the below steps to resolve the issue as suggested in 'https://visualvm.github.io/troubleshooting.html'. I gave full permission to my 'AppData\Local\Temp\hsperfdata_Dhasan' folder. But still i am getting the same error whenever i start visualvm. Please help me to fix this issue. Thanks. 回答1: Quit all java applications and delete hsperfdata_Dhasan folder. 来源