Python Exercise

The Python programming language has a small, formal, and rigid syntax.

• Identifiers are descriptive labels that identify a piece of data or a definition. Identifiers help developers organize their thoughts by giving items meaningful labels. A meaningful identifier is easier to remember. We access Python data and definitions with their identifier.
• Keywords are English words that have special meaning in the language.
• Statements are analogous to an English sentence. They are grammatically correct sequences of symbols, values, and words.
• Code blocks group statements together in related chunks.
• Whitespace is very important in Python syntax. If we alter whitespace, it changes the meaning of the code.
• Comments are messages embedded in the code so developers can read them, but are ignored by the interpreter.

Identifiers

• Class identifiers should be camelCase.
• Variable and function identifiers should be snake_case.
• We should never use unpredictable identifiers like ThIsNaMeIsVaLiDbUtCoNfUsInG. Identifiers should be meaningful and predictable.
• No single character identifiers.

A docstring

    """Prints a message to standard output.
    If `name` exists, prints it prefixed with "Hello".
    If it doesn't, reverses a "Hello world!" string.

    Parameters:
    name (string): an optional name of a person

    Returns:
    Nothing
    """

Multi-line comments

# This is a multi-line comment.
# Don't need to run these.
# We can wait.
# say_hello("")
# say_hello("Touger")

Single-line comments

   # check if the name is None or empty