Difference between “git add -A” and “git add .”

This answer only applies to Git version 1.x. For Git version 2.x, see other answers. Summary: git add -A stages all changes git add . stages new files and modifications, without deletions (on the current directory and its subdirectories). git add -u stages modifications and deletions, without new files Detail: git add -A is equivalent to git add .; git add -u. The important point … Read more

Why am I seeing “TypeError: string indices must be integers”?

item is most likely a string in your code; the string indices are the ones in the square brackets, e.g., gravatar_id. So I’d first check your data variable to see what you received there; I guess that data is a list of strings (or at least a list containing at least one string) while it should be a list of dictionaries.

how to sort pandas dataframe from one column

Use sort_values to sort the df by a specific column’s values: If you want to sort by two columns, pass a list of column labels to sort_values with the column labels ordered according to sort priority. If you use df.sort_values([‘2’, ‘0’]), the result would be sorted by column 2 then column 0. Granted, this does not really make sense for this example because … Read more

How to append something to an array?

Use the Array.prototype.push method to append values to the end of an array:  Run code snippet You can use the push() function to append more than one value to an array in a single call:  Run code snippet Update If you want to add the items of one array to another array, you can use firstArray.concat(secondArray):  Run code snippet Update … Read more

How to do associative array/hashing in JavaScript

Use JavaScript objects as associative arrays. Associative Array: In simple words associative arrays use Strings instead of Integer numbers as index. Create an object with JavaScript allows you to add properties to objects by using the following syntax: An alternate syntax for the same is: If you can, also create key-to-value object maps with the following … Read more

Understanding The Modulus Operator %

(This explanation is only for positive numbers since it depends on the language otherwise) Definition The Modulus is the remainder of the euclidean division of one number by another. % is called the modulo operation. For instance, 9 divided by 4 equals 2 but it remains 1. Here, 9 / 4 = 2 and 9 % 4 = 1. In your example: 5 divided by 7 gives 0 but it … Read more

How to define a two-dimensional array?

You’re technically trying to index an uninitialized array. You have to first initialize the outer list with lists before adding items; Python calls this “list comprehension”. #You can now add items to the list: Note that the matrix is “y” address major, in other words, the “y index” comes before the “x index”. Although you … Read more

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