15. Data Input

• Up until now our programs have worked with known values.

• We will begin to obtain the values during the execution of the programs.

name = input("Write your name: ") print(f"Hello {name}!")

15.1. Data Input Conversion

• The input function only returns strings.

• We use the int() and float() functions to convert a value to an integer or a floating-point value respectively.

unit_value = float(input("Value of a donut: ")) n = int(input("Number of donuts: ")) print(f"Total value: ${(n * unit_value)}")

15.2. Common Error

• Opening two parentheses and closing only one.

• The same can happen to us with braces, brackets, quotes, among other characters. {}, [], " " whenever we open one we must remember to close it.

• The error will end with the following:

>>> unit_value = float(input("Value of a donut: ")
File <string>, line 1
unit_value = float(input("Value of a donut: ")
                         ^
SyntaxError: '( was never closed

• Whenever the line seems correct, check the immediately previous line.

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