check if an input is a number code example

Example 1: how to say that an input needs to be a number python

try:
   val = int(userInput)
except ValueError:
   print("That's not an int!")

Example 2: python check if input is a number

user_input = input("Enter something:")

if type(user_input) == int:
    return user_input
else:
    print("Not a number")

Example 3: check if something is a number

<html>
<head></head>
<body>
<h1>isNaN() example</h1>

<script type="text/javascript">
 var num1 = 100;
 if(isNaN(num1)){
    document.write(num1 + " is not a number <br/>");
 }else{
    document.write(num1 + " is a number <br/>");
 }
 
 var str1 = "mkyong"
 if(isNaN(str1)){
    document.write(str1 + " is not a number <br/>");
 }else{
    document.write(str1 + " is a number <br/>");
 }
</script>

</body>
</html>

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Javascript Example

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