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Why does it say my variable is not defined?
A NameError is raised when you try to use a variable or a function name that is not valid. In Python, code runs from top to bottom. This means that you cannot declare a variable after you try to use it in your code. Python would not know what you wanted the variable to do.
Why PI is not defined?
But pi is an irrational number, meaning that its decimal form neither ends (like 1/4 = 0.25) nor becomes repetitive (like 1/6 = 0.166666…). (To only 18 decimal places, pi is 3.141592653589793238.) Hence, it is useful to have shorthand for this ratio of circumference to diameter.
Why do I get error Y is not defined in Python?
That’s a tuple on the right hand side and python will try to execute the two functions before assembling the tuple and assigning it to y. Since y doesn’t exist yet, you get the error.
Why do I get y error in Stack Overflow?
Since y doesn’t exist yet, you get the error. To expand @Scovetta’s comment, and @tdelaney’s explanation of why you have a problem, try: However, the above will jump straight to a prompt expecting user input (without actually asking for it) before assigning it to y. Thanks for contributing an answer to Stack Overflow!
Why do I get error message when I run function in Python?
Error message saying variable not defined when it is. Python I am trying to create a simple encryption program in python using functions but am having a problem where I get an error message when I run the program saying (‘msgReversed’ is not defined) when it is.
Why is my JavaScript function sometimes ” not defined “?
It will usually find a ton of small errors, so the warning “JSLint may hurt your feelings” is pretty spot on. A syntax error in the function — or in the code above it — may cause it to be undefined. If that was the case, it would never work. Occasional failure is not explainable with a syntax error.