How to check if a variable exists in Python

You can easily check if a variable exists in Python in either local or global scope.

To check if a variable exists in the global scope, verify the name of the variable as a string between quotes and use the in operator using the globals() function.

To check if a variable exists in the local scope, you also verify the name of the variable as a string and check it against the locals() function.

You can also read about it if you prefer on:

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[rayleblanc]

Is there a way to clear contents of a variable before restarting a program ? I have a script that reads and prints the input signal from a hobby RC receiver. My If statement is if the transmitter is off to blink an LED light and print NO SIGNAL. It only works the first time I run the program with the receiver turned off. When I turn on the receiver get my signal then stop the program and run it again with the receiver off, it prints off the last values it had. How can I get it cleared out?