You need to use parentheses: myList.insert([1, 2, 3]). When you leave out the parentheses, python thinks you are trying to access myList.insert at position 1, 2, 3, because that’s what brackets are used for when they are right next to a variable.
You need to consider that GROUP BY happens after the WHERE clause conditions have been evaluated. And the WHERE clause always considers only one row, meaning that in your query, the meta_key conditions will always prevent any records from being selected, since one column cannot have multiple values for one row. And what about the redundant meta_value checks? If a value is allowed to … Read more
What you are doing is printing the value in the array at spot [3][3], which is invalid for a 3by3 array, you need to loop over all the spots and print them. This will print it in the following format if you want more exact formatting you’ll have to change how the printf is formatted.
When you write the statement the compiler sees the constant string “abcdefghijklmnop” like an array. Imagine you had written the following code instead: Now, it’s a bit clearer what is going on. The left-hand side, *src, refers to a char (since src is of type pointer-to-char) whereas the right-hand side, otherstring, refers to a pointer. This isn’t strictly forbidden because you may want … Read more
Dijkstra’s shortest path algorithm is O(ElogV) where: V is the number of vertices E is the total number of edges Your analysis is correct, but your symbols have different meanings! You say the algorithm is O(VElogV) where: V is the number of vertices E is the maximum number of edges attached to a single node. Let’s rename your E to N. So one analysis says O(ElogV) and another … Read more
now you can use rgba in CSS properties like this: 0.5 is the transparency, change the values according to your design. Live demo http://jsfiddle.net/EeAaB/ more info http://css-tricks.com/rgba-browser-support/
try grep returns true if it finds the search target, and false if it doesn’t. So NOT false == true. if evaluation in shells are designed to be very flexible, and many times doesn’t require chains of commands (as you have written). Also, looking at your code as is, your use of the $( … ) form of cmd-substitution is to be commended, but think about … Read more
The error is not refering to myfunction but to start. I use the opportunity of this question to advise you about an known anti pattern using await which is : return await. WRONG CORRECT Also, know that there is a special case where return await is correct and important : (using try/catch)
The property() function returns a special descriptor object: It is this object that has extra methods: These act as decorators too. They return a new property object: that is a copy of the old object, but with one of the functions replaced. Remember, that the @decorator syntax is just syntactic sugar; the syntax: really means the same thing as so foo the function is replaced … Read more
As Roland pointed out, you can not scale categorical variables… In your case subsetting the data.frame to the columns with numeric values would help.