Page 25 - Programming With Python 3

An Introduction to STEM Programming with Python — 2019-09-03a Page 12
Chapter 1 — Python — Arithmetic, Numbers, and Variables

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Illustration 4: Variable Assignment in Python
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You may assign the result of an expression easily to a variable by placing the expression after the equal
sign.

1| Area = 8.5 * 9.3

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variable = expression Statement
The = sign performs assignment. It evaluates the expression on the right of the
equal sign and stores the result into the variable.

https://docs.python.org/3/reference/simple_stmts.html?highlight=assignment#assignment-
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statements
http://bit.ly/py3assign

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NOTE: Variable names are case-sensitive. Also, variables must start with a letter and contain
only letters, numbers, and underscores. You should avoid creating a variable with the name of a
builtin function in Python, unless you know what you are doing.
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Variable Retrieval

Once a value has been assigned a value, the variable name may be used in most places where a constant
value may be used. You may retrieve the value several times, but the value stored will not change until
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you explicitly change it.

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Illustration 5: Retrieval from a Variable

1| a = 9
2| b = 6

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