Python automatically assigns a variable the appropriate datatype based on the value it is given. A variable with the value 7 is an integer, 7. is a float, and "7" is a string. Sometimes, we will want to convert variables to different datatypes. For example, if we wanted to print out an integer as part of a string, we would need to convert that integer to a string first. We can do that using str():

age = 13 print "I am " + str(age) + " years old!"

This would print:

>>> "I am 13 years old!"

Similarly, if we have the string "7" and we want to perform arithmetic operations on it, we must convert it to a numeric datatype. We can do this using int():

number1 = "100" number2 = "10" string_addition = number1 + number2 # string_addition now has a value of "10010" int_addition = int(number1) + int(number2) # int_addition has a value of 110

If we have a string that is a floating point value, such as "7.5", we can convert it to a numeric datatype using float() instead:

string_num = "7.5" print float(string_num)
>>> 7.5

Using float() on an integer value, whether string or numeric, will convert the value to a float:

string_int = "10" numeric_int = 12 print float(string_int) print float(numeric_int)
>>> 10.0 >>> 12.0

The result of using int() on a floating point value will depend on whether the value is a string or numeric datatype. If you use int() on a floating point string value, it will raise a ValueError:

string_float = "7.5" print int(string_float)
Traceback (most recent call last): File "script.py", line 2, in <module> print int(string_num) ValueError: invalid literal for int() with base 10: '7.5'

Using int() on a floating point numeric value converts the number to an integer by removing the decimal portion and rounding the number closer towards 0:

numeric_float_positive = 7.5 numeric_float_negative = -9.5 print int(numeric_float_positive) print int(numeric_float_negative)
>>> 7 >>> -9

Note: Use caution when converting a floating point number into an integer, as this may result in the loss of the decimal data.



Create a variable called product that contains the result of multiplying the float value of float_1 and float_2.


Create a string called big_string that says:

The product was X

with the value of product where the X is.

Take this course for free

Mini Info Outline Icon
By signing up for Codecademy, you agree to Codecademy's Terms of Service & Privacy Policy.

Or sign up using:

Already have an account?