Variables

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Variables are probably the simplest things in Python. Unlike JavaScript, you do not need to tell the computer, "Hey, this variable that I'm setting here is a new variable." It's as if in Python, the program has already created every possible variable, but gave it a value that the computer knows that if you have a variable with that value, the computer says that the variable doesn't exist. 

To set a variable, write this: 

My_variable = "String" 

That is if you want it to be a string. A string can contain letters and numbers together, or it can be only letters. 

For a number-only variable, write this: 

My_variable = 1

For a Boolean statement, which is a value that is either true or false, write this: 

My_variable = True or False 

Lastly if you want your variable to have no value, you can't simply not write anything. You must write the following: 

My_variable = None

Some rules for variable names are:

• It cannot have punctuation in it, except underscores. No My_pet's_name

• It cannot have spaces. No My pets name

• It cannot start with a number. No 3_pets_names

You can redeclare a variable precisely the same way you declare it the first time.

My_variable = 2

That's variables in Python!