In this tutorial, we will Learn about Execution Modes of Python i.e command mode and Script mode.
We will also learn the Advantage and Disadvantage of running Python in different type of execution modes.

Execution Mode: “The Way or the option or the method of processing the python script is called execution mode”

Here in This tutorial we are going to learn python script execution modes. Python script can be executed in two ways.
1. Interactive Mode.
2. Script Mode.

1. Interactive Mode :

The way of running single line or blocks of python code is known as interactive python execution mode.
Interactive mode is also known as REPL.

REPL provides simple and quick way of running blocks or single line of Python code.
Python codes executes via the Python shell
i.e >>>    triple greater than sign, which comes by default with Python installation.
Interactive mode is one of the simple and very handy execution mode.
This mode is used to execute Python Basic commands. Lets understand interactive mode which is also known as REPL.
REPL stands for ‘Read-Eval-Print-Loop’.
REPL shell provides the results with single line Python Commands.
Lets understand what is ‘Read-Eval-Print-Loop’ in Detail.
Read:
This Read function is used to accept an input from user and stores it in python variable or memory.
Eval:
The Eval function in python evaluates the ‘input’ from memory.
Print:
Print function prints the output from the eval function.
Loop:
This function creates loop and terminates automatically itself when the program ends.
Interactive mode is command line shell executes python statements one by one and gives immediate feedback for each statement.
This mode is very convenient when you simply wish to execute Python Basic Commands.
Lets get hands on this beautiful Language.

Run python in interactive mode:

Open command prompt in windows.
On other OS for e.g Linux or macOS open the terminal and type “Python” and press the enter key.
This will open the python shell in interactive mode.

When you see this prompt means that the python shell, interactive execution mode is ready. Now we are ready to perform our task or run simple command or python script. Our you can just test Python functions using this mode.

Let us have some example on the interpreter :

The Print() Function

Prints the specific message to console or screen or other standard devices.
The message can be any objects or strings.

Every beginners or professional programmers needs help to understand or work better.
Getting help from python interpreter is simple.
Simply type help() in shell and press enter key.

1. Helpful when your script is extremely short and you want immediate results.
2. Faster as you only have to type a command and then press the enter key to get the results.
3. Good for beginners who need to understand Python basics. Disadvantages interactive mode. 1. Editing the code in interactive mode is hard as you have to move back to the previous commands or else you have to rewrite the whole command again.
2. It's very tedious to run long pieces of code.

2. Script Mode :

Script mode is the execution mode used when user is working with block of code or more than one lines of code.
Script mode is used when user want to execute one or more lines of code. One or more number of lines of code is executed in one execution.
If someone want to write long piece of code, then python interactive mode is not recommended.
To write piece of code we need to save(store) in the python file with .py extension and this file is known as script.
Text editor is used to write python script.
Number of popular text editors are available to write python script. E.g Sublime, Atom, notepad++,etc.

Upon execution the python script, all commands executes in one go.

1. From python IDLE shell goto File Menu.
2. Then press new file or Ctl+N ,after it. new file dialog opens up.
3. Write python script.
e.g
print(“Wellcome to Python”)
print(“Developed by Guido Van Rossum”)
4. Save the script by .py extension.
e.g welcome.py

5. Execute the script(or the file welcome.py).

a. go to run menu and the press Run to execute module.
You will get the Following output.

Wellcome to Python
Developed by Guido Van Rossum
Or
Just press F5 to execute the script.

Advantages of Script mode.
1. Simple and Easy to run large number of code.
2. Editing and modification in script is easier in script mode.
3. Good for both beginners and experts.

Disadvantages of Script mode.
1. Script mode will be tedious when you need to run only a single or a few lines of code.
2. We need to create and save a file before executing script or code.