Numerical Computing with Python

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A consequence of pandas using different syntax for the logical operators is that operator precedence is no longer the same. The comparison operators have a higher precedence than and, or, and not. However, the new operators for pandas (the bitwise operators &, |, and ~) have a higher precedence than the comparison operators, thus the need for parentheses. An example can help clear this up. Take the following expression:

>>> 5 < 10 and 3 > 4False 

In the preceding expression, 5 < 10 evaluates first, followed by 3 < 4, and finally, the and evaluates. Python progresses through the expression as follows:

>>> 5 < 10 and 3 > 4>>> True and 3 > 4>>> True and False>>> False

Let's take a look at what would happen if the expression in ...