There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "However, when the print() function is called in line 11, the text is printed as it was originally entered."

A block of code is set as follows:

tank1 = tank.Tank(
           "Tank 1", 
           level=36.0, 
           fluid_density=DENSITY, 
           spec_gravity=SPEC_GRAVITY, 
           outlet_diam=16, 
           outlet_slope=0.25
    )

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

import sys 
  if len(sys.argv) > 1:  # Check if arguments are provided 
      entered_value = sys.argv[1:]  # Capture all arguments except program name 

Any command-line input or output is written as follows:

$ python foo.py -f /home/User/Documents

Bold: Indicates a new term, an important word, or words that you see on screen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."