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This article is about how python uses if x in list to simplify if statements. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Simplify if statements with if x in list instead of checking each item individually

Suppose we have a list of dominant colors red, green, and blue. Somewhere in the code, we have a new variable that contains some colors, here c = red. Then we need to check whether the color comes from our dominant color. Of course we can check every item in the list like this:

Colors = ["red", "green", "blue"] c = "red" # cumbersome and error-prone if c = = "red" or c = = "green" or c = = "blue": print ("is main color")

But this can become very troublesome and we can easily make mistakes, for example, if we have a wrong red here. A simpler and better way is to use the syntax if x in list.

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