Importing C++ programs in Python. Formula Sheet

Key Syntaxes and Module Formulas

C++ Script Execution Command:

python filename.py -i cpp_filename

Module Function Access Formula:

module_name.function_name()

module_name: Name of the imported standard or user-defined module.
. (Dot Operator): The binding operator used to access functions within modules.
function_name(): The function defined inside the imported module.

C++ Compilation Command Formula:

os.system('g++ ' + inp_file + ' -o ' + exe_file)

os.system(): The method that executes shell commands from Python.
g++: The GNU C++ compiler command.
inp_file: Variable holding the input C++ file name with the .cpp extension.
-o: Output flag specifying that the following argument is the output executable name.
exe_file: Variable holding the compiled executable file name with the .exe extension.

Command-Line Argument Parsing Formula:

opts, args = getopt.getopt(argv, options, [long_options])

opts: Returned list of option-value pairs (e.g., [('-i', 'path')]).
args: Returned list of remaining arguments or errors (empty if parsing succeeds).
argv: The list of arguments to be parsed, typically sys.argv[1:].
options: String representing single-character options (e.g., 'i:'). A colon indicates the option requires an argument.
long_options: List of long options (e.g., ['ifile=']). An equals sign indicates the option requires an argument.

Main Script Execution Conditional block:

if __name__ == '__main__': main(sys.argv[1:])

__name__: Built-in variable evaluating to the current module's name.
'__main__': The value assigned to __name__ when the script is run directly.
sys.argv[1:]: Slices command-line arguments to exclude the script name itself (sys.argv).