Expressions and Variables

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Expressions and variables. Expressions are operations performed by Python, such as basic arithmetic operations like addition, subtraction, multiplication, and division. Operands are the numbers involved in the operation, while operators are the symbols representing the operation, like addition (+), subtraction (-), multiplication (*), and division (/). Python follows mathematical conventions when evaluating expressions.

Variables are used to store values in Python. They are assigned using the equal sign (=) and can hold various types of data, including numbers, strings, and more complex data structures. Meaningful variable names should be used to improve code readability.

Operations can be performed on variables, and the result can be stored in another variable. Variables can also be reassigned new values, and the old value will be replaced.

It's important to use meaningful variable names to make the code more understandable. For example, if we want to convert the number of minutes in a dataset to the number of hours, we can use variables like "total_min" and "total_hour" to represent the total number of minutes and hours, respectively. By dividing the total minutes by 60, we can obtain the total number of hours.

If we modify the value of one variable, the value of other variables dependent on it will change accordingly without the need to modify the rest of the code.

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