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I want to pick out some items in one rectangular box with axis limits of (xmin, xmax, ymin, ymax, zmin, zmax). So i use the following conditions,
if not ((xi >= xmin and xi <= xmax) and (yi >= ymin and yi <= ymax) and (zi >= zmin and zi <= zmax)):
expression
But I think python has some concise way to express it. Does anyone can tell me?
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Use a dictionary to simplify a long if statement Since the dictionary maps strings to functions, the operation variable would now contain the function we want to run. All that's left is to run operation(numbers) to get our result. If the user entered 'add' , then operation will be the sum function.
YOU ARE NOT ALLOWED. BYE ! Not just two conditions we can check more than that by using 'and' and 'or'.
We can have a if...elif...else statement inside another if...elif...else statement. This is called nesting in computer programming. Any number of these statements can be nested inside one another.
Typical case for operator chaining:
if not (xmin <= xi <= xmax and ymin <= yi <= ymax and zmin <= zi <= zmax):
Not only it simplifies the comparisons, allowing to remove parentheses, while retaining readability, but also the center argument is only evaluated once , which is particularly interesting when comparing against the result of a function:
if xmin <= func(z) <= xmax:
(so it's not equivalent to 2 comparisons if func has a side effect)
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