except

问题 I know MariaDB and MySQL don't support EXCEPT. I would like to find an alternative to something like this: SELECT * FROM table EXCEPT SELECT * FROM backup_table Where the table and backup_table have the same schema. All the posts I've seen suggests that I compare a single column using "WHERE column IN (...)". The problem in my case is that I need to compare all the columns between the two tables for every table. I'm hoping to write this as procedure or function looping through all the tables,

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: LINQ find differences in two lists I want to find a difference between 2 series. So I am using Except in the LINQ statement. But Except seems to work only when the first collection is longer than the second. For example this will not return any result, even though the 2 collections are different. double[] numbers1 = { 2.0, 2.1, 2.2, 2.3, 2.4, 2.5 }; double[] numbers2 = { 2.2 }; IEnumerable<double> onlyInFirstSet

问题 This question already has answers here : About catching ANY exception (8 answers) Closed 10 months ago . I tried making a function to check if an image is displayed on the screen using PyAutoGui and came up with this: def check_image_on_screen(image): try: pyautogui.locateCenterOnScreen(image) return True except: return False And it works fine, but PyCharm tells me I shouldn't leave except bare. What is the problem with leaving it like this? Is there a more appropriate way of creating the

问题 This question already has answers here : Python try…except comma vs 'as' in except (5 answers) Closed 5 years ago . I've got a SyntaxError on my except: try: opts, args = getopt.getopt(sys.argv[1:], 'P:D:H:d:u:p:nvhmJi:c:Ml:TB:', ['host=', 'port=', 'directory=', 'user=', 'password=', 'daemon=', 'noauth', 'help', 'verbose', 'mysql', 'icounter=', 'config=', 'nolock', 'nomime', 'loglevel', 'noiter', 'baseurl=']) except getopt.GetoptError, e: print usage print '>>>> ERROR: %s' % str(e) sys.exit(2

问题 I am trying to use the EXCEPT clause to retrieve data from table. I want to get all the rows from table1 except the one's that exist in table2 . As far I understand, the following would not work: CREATE TABLE table1(pk_id int, fk_id_tbl2 int); CREATE TABLE table2(pk_id int); Select fk_id_tbl2 FROM table1 Except Select pk_id FROM table2 The only way I can use EXCEPT seems to be to select from the same tables or select columns that have the same column name from different tables. Can someone

问题 I've created a bunch of functions and I need very similar except clauses in all of them, but I hate having so many lines of try and except clauses and the same code inside of each function. For example: import sys import random def foo(): num=random.random() try: if num>0.5: print 'OK' elif num>0.25: raise NameError('Too Small') else: raise KeyboardInterrupt except NameError: print "%s had a NameError" % sys._getframe().f_code.co_name except: print "%s had a different Error" % sys._getframe()

问题 I am a beginner in Python and have been testing different kinds of sample code. When I started using Python3 instead of 2.7; I came upon a syntax error, but I don't understand how to fix that error. File "app.py", line 101 except InvalidUserPass, e: ^ SyntaxError: invalid syntax Here is more of that code to give some context: @app.route('/login/', methods=['GET', 'POST']) def login(): error = None if request.method == 'POST': session['username'] = request.form['username'] session['password']

问题 I am using two lists List<int> a = {1,2,3}; List<int> b = {3}; and using Except to compare and filter them. var diff = a.Except(b).ToList(); this returns values as 1 2 I need to return a bool value along with that ie. the return values should be as 1 true 2 true the return type is a List<modelClass> that has int id, bool isTrue properties Can you help me in doing this ? 回答1: Can't you just do this: var diff = a.Except(b) .Select(s=>new modelClass(){id = s, isTrue = true}) .ToList(); 来源： https

问题 I have a string as an input for the code I'm writing and let an example of the string be: "12 inches makes 1 foot" My goal is to have my code run through this string and just pull out the integers and add them. So the output for the string above would be 13. I am using try and except in here as well since another sample input string could be something like "pi is 3.14". msg= "12 inches makes 1 foot" thesum = 0 s= msg.split() for a in s: try: if a == int(a): a= int(a) thesum += a print (thesum

问题 I want to attain a list of BeerNames from a list whose names are not on a second list. var myList=(from f in Beers where ... select f.BeerNames).ToList var storeList(from f in Store where... select f).ToList() MyList will have some BeerNames that are not on StoreList. How do I find those BeerNames? I tried .Except and !Contains but I realize I'm doing something wrong, and missing some key bit of knowledge. thanks If I change var storeList(from f in Store where... select f).ToList() to var