IPP-DEV-02-001: Integers and Floats

[labbenchstudios]

Description

• Using instructions from the in-class lecture, create a module to test some of the basic functionality of Python's standard types - specifically, integers (int) and floats (float).

Review the README

• Please see README.md for further information on, and use of, this content.
• License for embedded documentation and source codes: IPP-DOC-LIC

Estimated effort may vary greatly

• The estimated level of effort for this exercise shown in the 'Estimate' section below is a very rough approximation. The actual level of effort may vary greatly depending on your development and test environment, experience with the requisite technologies, and many other factors.

Actions

Step 1: Make Sure Your System is Setup for Python and This Course

• See IPP-CFG-01-001

Step 2: REMINDER: Make Sure PYTHONPATH is Set Correctly

Whether running Python tests within your IDE or from the command line, you must set the PYTHONPATH environment variable in every execution environment (e.g., every terminal you launch) when attempting to run any of your scripts and their tests or the IPP test app from the command line. The IPP source and test paths will be as follows:

• {your IPP source code path}
• {your IPP source code path}/tests

See IPP-DEV-01-001 for details.

Step 3: Create your own module to test standard Python numerics - int and float...

• Using your IDE, or from within a terminal, create a new Python file - a module - named SimpleNumerics.py within the labmodule02 path (or package)
• Open the module, and create the indicated test cases:

Test 1 (int)

• Create a comment at the beginning of the file:
  • For example:
  • # Test 1: int
• Declare the age variable as an integer. Use a value between 20 and 100
• Declare the count variable as an integer. Use a negative value between -5 and -25
• Declare the large_number variable as an integer. Enter the value as 1000000
• Declare the alt_large_number variable as an integer. Enter the value as 1_000_000
• Print the variables to the console
  • For example:
  • print(f"Age: {age}; Count: {count}; Large #: {large_number}; Alt Large #: {alt_large_number}")

Test 2 (float)

• Within the same module, add a blank newline after the previous test, and create another comment:
  • For example:
  • # Test 2: float
• Declare the price variable as a float. Use a decimal value such as 19.99
• Declare the temperature variable as a float. Use a decimal value such as 72.4
• Declare the sci_value variable as a float. Use a decimal value with scientific notation such as 1.23e-4
• Print the three variables to the console (price, temperature, and sci_value). You can use the example in Test 1 as a guide.

Test 3 (abs and conversion)

• Create a comment at the beginning of the file:
  • For example:
  • # Test 3: abs() and conversion
• Re-declare the price variable as a float. Use a decimal value such as 15.99 (anything is fine, as long as it contains decimals and is different from the initial declaration)
• Declare the price_no_cents variable as an integer. Using the example covered in class, create the integer using the int() function (it's actually a constructor), and pass price in as the argument.
• Declare the price_with_cents variable as a float. Using the example covered in class, create the float using the float() function (it's actually a constructor), and pass price_no_cents in as the argument.
• Print the three variables to the console (price, price_no_cents, and price_with_cents). You can use the example in Test 1 as a guide.

Estimate

• Small

Tests

• From within your IDE

  • Right click on your newly created module SimpleNumerics.py and click your IDE's run icon
  • You should see output similar to that discussed in class

• From the command line

  • Open a terminal and cd to your IPP_HOME path
  • Start your virtual environment (if not already running)
  • Be sure your PYTHONPATH is set correctly
  • Run the module
    • python ./labmodule02/SimpleNumerics.py
  • You should see output similar to that discussed in class

Sample output (yours may differ slightly)

Age: 25; Count: -10; Large #: 1000000; Alt Large #: 1000000
Price: 19.99; Temperature: 72.4; Scientific Value: 0.000123
Absolute Count: 10
Price: 15.99; Price - no cents: 15; Price - back to cents: 15.0