About

REPL (an acronym for “read-eval-print loop”) is a execution paradigm implemented in a command line interpreter that:

• reads what you type (i.e.
  • a statement for a language
  • a command for an OS Shell
• evaluates it,
• and prints the result if any.

A REPL console is a synonym for a command line interpreter.

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Implementation

Steps:

• Prompt the user for some code,
• When they’ve entered it, execute it in the same process.

while True:
    code = input(">>> ")
    exec(code)

it’s much more complex, because it has to deal with:

• multi-line code,
• tab completion (using readline for instance),
• magic commands,
• and so on.