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Pythonic way of checking if a condition holds for any element of a list
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Is possible to create a non-existent method when it is called in Python?
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Check if a property exists in a class
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What's the best way to check if a file exists in C?
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Shell script check if file exists?
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How do you check if there are any equal arguments(even sublist) in a list?
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How to check whether operator== exists?
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How can I check if a URL exists via PHP?
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Check synchronously if file/directory exists in Node.js
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Easy way to check that a variable is defined in python?
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Check if file exists in C++
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Check if element exists in jQuery
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How to check if one of the following items is in a list?
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MySQL check if a table exists without throwing an exception
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In Python, how do I determine if an object is iterable?
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How can I check if a program exists from a Bash script?