Variables for Numbers
But we can not only assign strings to a variable. You can also assign a number.
1coins = 70
After writing the code above, every time you call the coins variable in your code, Python will know that you mean 70. You can use this variable in math and more.
Let's see how to add 20 to this variable.
1print(coins + 20)
Python remembers that coins refers to 70, so it will return 90 (70 + 20 = 90).
Unlike a string, a number does not need to be quoted. This is how Python understands that it is a number with which it can calculate mathematical expressions, and not a text string.
Python can also perform calculations that consist only of variables. For example
1234price_of_tangerines = 15 price_of_lemon = 7 total_price = price_of_tangerines + price_of_lemon print(total_price)
The variable total_price now has a value of 22.
12original_number = 17 original_number = original_number + 8
Let's look at very intresting example.
123price_1 = "100" new_price = price_1 + 17 print(new_price)
This code throws an error because Python cannot sum a string and a number.
It's time to practice.
Swipe to start coding
Assign a number (35) to the variable number. Add 5 to the variable number and assign the result to the same variable. Display the result on the screen using print statement.
Soluzione
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Completion rate improved to 5.88Variables for Numbers
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But we can not only assign strings to a variable. You can also assign a number.
1coins = 70
After writing the code above, every time you call the coins variable in your code, Python will know that you mean 70. You can use this variable in math and more.
Let's see how to add 20 to this variable.
1print(coins + 20)
Python remembers that coins refers to 70, so it will return 90 (70 + 20 = 90).
Unlike a string, a number does not need to be quoted. This is how Python understands that it is a number with which it can calculate mathematical expressions, and not a text string.
Python can also perform calculations that consist only of variables. For example
1234price_of_tangerines = 15 price_of_lemon = 7 total_price = price_of_tangerines + price_of_lemon print(total_price)
The variable total_price now has a value of 22.
12original_number = 17 original_number = original_number + 8
Let's look at very intresting example.
123price_1 = "100" new_price = price_1 + 17 print(new_price)
This code throws an error because Python cannot sum a string and a number.
It's time to practice.
Swipe to start coding
Assign a number (35) to the variable number. Add 5 to the variable number and assign the result to the same variable. Display the result on the screen using print statement.
Soluzione
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Awesome!
Completion rate improved to 5.88single
