Python: guida alla sintassi in modalità interattiva

Avviare python.
Per ottenere una descrizione concisa delle istruzioni, del linguaggio python, al prompt, digitate help(), es:

>>> Help()
Invio da tastiera

Welcome to Python 2.6! This is the online help utility.

If this is your first time using Python, you should definitely check out
the tutorial on the Internet at http://docs.python.org/tutorial/.

Enter the name of any module, keyword, or topic to get help on writing
Python programs and using Python modules. To quit this help utility and
return to the interpreter, just type "quit".

To get a list of available modules, keywords, or topics, type "modules",
"keywords", or "topics". Each module also comes with a one-line summary
of what it does; to list the modules whose summaries contain a given word
such as "spam", type "modules spam".

help> if
Invio da tastiera

The ``if`` statement

********************

The ``if`` statement is used for conditional execution:

if_stmt ::= "if" expression ":" suite

( "elif" expression ":" suite )*

["else" ":" suite]

It selects exactly one of the suites by evaluating the expressions one

by one until one is found to be true (see section *Boolean operations*

for the definition of true and false); then that suite is executed

(and no other part of the ``if`` statement is executed or evaluated).

If all expressions are false, the suite of the ``else`` clause, if

present, is executed.

(END)

Per ritornare al prompt di python >>>, premere il tasto q

Per ottenere una descrizione delle funzioni built-in (type,str,dir,file... Vedi lista al link: http://docs.python.it/html/lib/built-in-funcs.html), al prompt di python, basta scrivere:
>>> help(nomefunzionebuil-in)