The query given to mysqli_query() is failing and returning false. Put this after mysqli_query() to see what’s going on. For more information: http://www.php.net/manual/en/mysqli.error.php
Which gives the error: AttributeError: ‘numpy.bool_’ object has no attribute ‘index’ Which looks like it is relating to the following line: Now I’m just wondering how this is meant to work, as the whole purpose of creating this list is to have a True/False indicator iterated across a data set depending on the rule of … Read more
I think you need reset_index for same index values and then comapare – for create new column is better use mask or numpy.where: Also instead + use | because working with booleans. Samples:
For MySQL 5.0.3 and higher, you can use BIT. The manual says: As of MySQL 5.0.3, the BIT data type is used to store bit-field values. A type of BIT(M) enables storage of M-bit values. M can range from 1 to 64. Otherwise, according to the MySQL manual you can use BOOL or BOOLEAN, which are at the moment … Read more
You could use the BIT datatype to represent boolean data. A BIT field’s value is either 1, 0, or null.
The or and and python statements require truth-values. For pandas these are considered ambiguous so you should use “bitwise” | (or) or & (and) operations: These are overloaded for these kind of datastructures to yield the element-wise or (or and). Just to add some more explanation to this statement: The exception is thrown when you want to get the bool of a pandas.Series: What you hit was a place where the operator implicitly converted … Read more
The or and and python statements require truth-values. For pandas these are considered ambiguous so you should use “bitwise” | (or) or & (and) operations: These are overloaded for these kind of datastructures to yield the element-wise or (or and). Just to add some more explanation to this statement: The exception is thrown when you want to get the bool of a pandas.Series: What you hit was a place where the operator implicitly converted … Read more
From best to worse: Option 1 (C99 and newer) Option 2 Option 3 Option 4 Explanation Option 1 will work only if you use C99 (or newer) and it’s the “standard way” to do it. Choose this if possible. Options 2, 3 and 4 will have in practice the same identical behavior. #2 and #3 … Read more