enumerate

Is there any way to enumerate tables used in mysql query? Lets say I have query : SELECT * FROM db_people.people_facts pf INNER JOIN db_system.connections sm ON sm.source_id = pf.object_id INNER JOIN db_people.people p ON sm.target_id = p.object_id ORDER BY pf.object_id DESC And I want in return array: $tables = array( [0] => 'db_people.people_facts', [1] => 'db_system.connections', [2] => 'db_people.people', ); Wiliam The solution marked as good will return only the result tables. But if you do the next query it will fail: SELECT users.* FROM users, cats, dogs WHERE users.id = cats.user_id

my CSV looks like John,Bomb,Dawn 3,4,5 3,4,5 3,4,5 I want to add ID column in front like so: ID,John,Bomb,Dawn 1,3,4,5 2,3,4,5 3,3,4,5 using enumerate function, but I don't know how. Here's my code so far: import csv with open("testi.csv", 'rb') as input, open('temp.csv', 'wb') as output: reader = csv.reader(input, delimiter = ',') writer = csv.writer(output, delimiter = ',') all = [] row = next(reader) row.append('ID') all.append(row) count = 0 for row in reader: count += 1 while count: all.append(row) row.append(enumerate(reader, 1)) break writer.writerows(all) And the output comes all wrong

What algorithm do you use to enumerate the strings generated by a context-free grammar? It seems doable when there is no recursion, but I can't figure out how to do it in the general case, which might contain all kinds of (possibly indirect) recursion. (I'm not looking for an esoteric solution like the one on this page ; I'm looking for an algorithm that I could map to standard imperative code.) Here's an obvious but somewhat inefficient algorithm: Construct R, the Earley parser for the grammar. For each string S in A* (A is the alphabet for the grammar): If R recognizes S: Output S Here I

If I want to enumerate an array (say for a map() function where I would need to use the index of an element together with its value), I could use enumerate() function. E.g.: import Foundation let array: [Double] = [1, 2, 3, 4] let powersArray = array.enumerate().map() { pow($0.element, Double($0.index)) } print("array == \(array)") print("powersArray == \(powersArray)") // array == [1.0, 2.0, 3.0, 4.0] // powersArray == [1.0, 2.0, 9.0, 64.0] <- As expected Now, if I want to use some sub-sequence from the array, I could use a slice , and it would allow me to use just the same indices as I would

I've been placed on a project whose client front end is written in VB 6, ack! I'm trying to develop a custom collection class that supports the For...Each syntax. Is this possible in VB 6? Or am I stuck with using the For..Next with counter to identify the index. Thanks for the help! Justin Largey The key part is adding this to the custom collection class... Public Function NewEnum() As IUnknown Set NewEnum = m_Employees.[_NewEnum] End Function and in the procedure attributes, set the procedure id to -4, like so: Ref: http://www.vb-helper.com/howto_custom_collection_with_for_each.html 来源：

f=open('Student.dat','r+') # opens Student.dat file roll1=input("Enter roll to be found") # to find a record in a list using a roll no rec=f.readlines() for i,lst in enumerate(rec): if lst == roll1: print rec[i] Is this the proper way to use enumerate?? or should i use another loop within?? Here enumerate doesn't help much; you could use instead (which would be simpler and clearer): for i in rec: if i == roll1: print i enumerate is useful when you really need to get at the same time values and indices, which doesn't seem to be the case here. (In your piece of code rec[i] does the same thing

I am trying to get the hwnd of the current tray icons. what I did is getting the hWnd of system trat window by using this code: [DllImport("user32.dll", SetLastError = true)] static extern IntPtr FindWindowEx(IntPtr hWndParent, IntPtr hWndChildAfter, string lpClassName, string lpWindowName); [DllImport("user32.dll", SetLastError = true)] static extern IntPtr FindWindow(string lpClassName, string lpWindowName); static IntPtr GetSystemTrayHandle() { IntPtr hWndTray = FindWindow("Shell_TrayWnd", null); if (hWndTray != IntPtr.Zero) { hWndTray = FindWindowEx(hWndTray, IntPtr.Zero, "TrayNotifyWnd",

I have this list [['a', 'a', 'a', 'a'], ['b', 'b', 'b', 'b', 'b'], ['c', 'c', 'c', 'c', 'c']] and I want to concatenate 2nd and 3rd elements in each row, starting from the second row, to make something like this: [['a', 'a', 'a', 'a'], ['b', 'bb', 'b', 'b'], ['c', 'cc', 'c', 'c']] It seems to work fine, when I do it to every row: for index, item in enumerate(list_of_lines, start=0): list_of_lines[index][1:3] = [''.join(item[1:3])] but when I'm starting from the second row - I have "list index out of range" error: for index, item in enumerate(list_of_lines, start=1): list_of_lines[index][1:3] =