Mastering Variables: From Numbers to Strings in Simple Code Examples

We first introduce the concept of a variable as a name that represents a value in a program, allowing code to read more like natural language and freeing programmers from memorizing raw numbers.

Example 1 assigns the number of men and women to variables and prints the difference:

men_num = 30
women_num = 10
print(men_num - women_num)

The expected output is 20 because the variable men_num holds 30 and women_num holds 10, and the subtraction yields 20.

Example 2 works with larger numbers representing cars and drivers, computes the number of drivers without a car, and prints three informative statements:

car_num = 100  # number of cars
driver_num = 50  # number of drivers
not_car_driver_num = car_num - driver_num  # drivers without a car
print("There are", car_num, "cars available")
print("There are only", driver_num, "driver available")
print("There will be", not_car_driver_num, "empty cars")

The program outputs:

There are 100 cars available

There are only 50 driver available

There will be 50 empty cars

Finally, the tutorial shows how to store a string in a variable and concatenate it with another string using the + operator:

name = "Lucy"
print("My name is " + name)

The output is My name is Lucy, illustrating that the + operator joins strings while it adds numbers when both operands are numeric.

These step‑by‑step examples demonstrate the fundamental role of variables in handling both numeric and textual data, preparing readers for more advanced programming topics.