# Quick Answer: Which Is The Correct Name Of A Variable?

Rules for Python variables:A variable name must start with a letter or the underscore character.A variable name cannot start with a number.A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )Variable names are case-sensitive (age, Age and AGE are three different variables).

## What is the correct way to name a private variable?

Make it private, name it perfectly and give getters and setters public. You should not use names that begin with an underscore or contain a double underscore.

## What are 3 types of variables?

A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled. The independent variable is the one that is changed by the scientist.

## Which mathematical expression in python is evaluated first?

Python follows the same precedence rules for its mathematical operators that mathematics does. Parentheses have the highest precedence and can be used to force an expression to evaluate in the order you want. Since expressions in parentheses are evaluated first, 2 * (3-1) is 4, and (1+1)**(5-2) is 8.

## Which is a good example of a variable name?

The following are examples of valid variable names: age, gender, x25, age_of_hh_head.

## What are valid variable names?

A valid variable name starts with a letter, followed by letters, digits, or underscores. … The maximum length of a variable name is the value that the namelengthmax command returns. You cannot define variables with the same names as MATLAB keywords, such as if or end .

76trombones is illegal because it does not begin with a letter. more\$ is illegal because it contains an illegal character, the dollar sign. Python keywords (Keywords define the language’s syntax rules and structure, and they cannot be used as variable names. )

## What are valid variable names in C?

Rules for naming a variableA variable name can only have letters (both uppercase and lowercase letters), digits and underscore.The first letter of a variable should be either a letter or an underscore.There is no rule on how long a variable name (identifier) can be.

## How do you name a variable?

Rules for naming variables:All variable names must begin with a letter of the alphabet or an. underscore( _ ). … After the first initial letter, variable names can also contain letters and numbers. … Uppercase characters are distinct from lowercase characters. … You cannot use a C++ keyword (reserved word) as a variable name.

## What are the 5 variables?

There are six common variable types:DEPENDENT VARIABLES.INDEPENDENT VARIABLES.INTERVENING VARIABLES.MODERATOR VARIABLES.CONTROL VARIABLES.EXTRANEOUS VARIABLES.

## What type of variable is age?

Mondal[1] suggests that age can be viewed as a discrete variable because it is commonly expressed as an integer in units of years with no decimal to indicate days and presumably, hours, minutes, and seconds.

## What is variable and its types?

Common Types of Variables. Categorical variable: variables than can be put into categories. … Dependent variable: the outcome of an experiment. As you change the independent variable, you watch what happens to the dependent variable. Discrete variable: a variable that can only take on a certain number of values.

## What questions does Python ask?

what question is Python asking you? What Python statement would you like me to run? What is the air-speed velocity of an unladen swallow? What is the next machine language instruction to run?

## What is mnemonic Python?

keyword A reserved word that is used by the compiler to parse a program; you cannot use keywords like if, def, and while as variable names. mnemonic A memory aid. We often give variables mnemonic names to help us remember what is stored in the variable.

## What is a bad Python variable name?

The option c (23spam) is a bad Python variable name. Variable name can be alpha-numeric and even with but variable names cannot start with numeric characters.