Shebang / Interpreter Directive
At the very first line of your Python 3 script file which could be named cels_to_fahr.py, enter a shebang (#!) followed by the interpreter directive:
#!/usr/bin/env python3Input
Leave a space below the shebang/interpreter directive. Then add the following:
celsius = float(input('Enter Celsius Temperature: '))When the script executes, the user is prompted for a numerical value; a temperature in Celsius. That numerical value is actually converted to a string object by input(), then float() converts the string object to a float object—a decimal value to be applied to the temperature conversion formula. That value is stored in a new celsius variable. If a user entered something erroneous, like a text string, an error message would be returned. (note: code for exception handling, including error messages, could be added.)
Temperature Conversion Formula
Next, add a formula for converting Celsius to Fahrenheit. This is where the value stored in the celsius variable will be converted to Fahrenheit. The converted value will then be stored in a new fahrenheit variable.
fahrenheit = ((celsius * 9) / 5) + 32Print Result
Finally, the value of fahrenheit is printed. To display the conversion from Celsius to Fahrenheit degrees.
print('Same as', fahrenheit, 'degrees Fahrenheit')The Python script could be saved as cels_to_fahr.py (see Figure 1).
#!/usr/bin/env python3celsius = float(input('Enter Celsius Temperature: '))
fahrenheit = ((celsius * 9) / 5) + 32
print('Same as', fahrenheit, 'degrees Fahrenheit')
In a Unix terminal emulator, navigate to the directory where the script is stored, then run the script by entering:
python3 cels_to_fahr.pyAlternative Print Line
The print line can be revised to clarify your result (see Figure 2).
print(str(celsius) + '°C' + ' converts to ' + str(fahrenheit) + '°F')
Your Turn
Now use the example to create your own script which converts Fahrenheit to Celsius. Or a script which solves some mathematical problem.
