Because the equality operator == coerces, or converts, the data type temporarily to see if it’s equal to the other operand, whereas === (the identity operator) doesn’t need to do any converting whatsoever and thus less work is done, which makes it faster.
The spaceship operator will return 1, 0, or −1 depending on the value of the left argument relative to the right argument. a <=> b := if a < b then return -1 if a = b then return 0 if a > b then return 1 if a and b are not comparable then … Read more
Operator precedence 2.x, 3.x. The precedence of not is lower than that of in. So it is equivalent to: >>> not ((True) in [False, True]) False This is what you want: >>> (not True) in [False, True] True As @Ben points out: It’s recommended to never write not(True), prefer not True. The former makes it … Read more
Take a look here: http://longgoldenears.blogspot.com/2007/09/triple-equals-in-javascript.html The 3 equal signs mean “equality without type coercion”. Using the triple equals, the values must be equal in type as well. 0 == false // true 0 === false // false, because they are of a different type 1 == “1” // true, automatic type conversion for value only … Read more
Empty strings are “falsy” (python 2 or python 3 reference), which means they are considered false in a Boolean context, so you can just do this: if not myString: This is the preferred way if you know that your variable is a string. If your variable could also be some other type then you should … Read more