【Python】【基础知识】【内置函数】【help的使用方法】

>>> help
Type help() for interactive help, or help(object) for help about object.
>>> help()

Welcome to Python 3.7‘s help utility!

If this is your first time using Python, you should definitely check out
the tutorial on the Internet at https://docs.python.org/3.7/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, symbols, or topics, type
"modules", "keywords", "symbols", or "topics".  Each module also comes
with a one-line summary of what it does; to list the modules whose name
or summary contain a given string such as "spam", type "modules spam".

help> abs
Help on built-in function abs in module builtins:

abs(x, /)
    Return the absolute value of the argument.

help> input
Help on built-in function input in module builtins:

input(prompt=None, /)
    Read a string from standard input.  The trailing newline is stripped.
    
    The prompt string, if given, is printed to standard output without a
    trailing newline before reading input.
    
    If the user hits EOF (*nix: Ctrl-D, Windows: Ctrl-Z+Return), raise EOFError.
    On *nix systems, readline is used if available.

help> input()
No Python documentation found for ‘input()‘.
Use help() to get the interactive help utility.
Use help(str) for help on the str class.

help> quit

You are now leaving help and returning to the Python interpreter.
If you want to ask for help on a particular object directly from the
interpreter, you can type "help(object)".  Executing "help(‘string‘)"
has the same effect as typing a particular string at the help> prompt.
>>> 

>>> help("time")
Help on built-in module time:

NAME
    time - This module provides various functions to manipulate time values.

DESCRIPTION
    There are two standard representations of time.  One is the number
    of seconds since the Epoch, in UTC (a.k.a. GMT).  It may be an integer
    or a floating point number (to represent fractions of seconds).
    The Epoch is system-defined; on Unix, it is generally January 1st, 1970.
    The actual value can be retrieved by calling gmtime(0).
    
    The other representation is a tuple of 9 integers giving local time.
    The tuple items are:
      year (including century, e.g. 1998)
      month (1-12)
      day (1-31)
      hours (0-23)
      minutes (0-59)
      seconds (0-59)
      weekday (0-6, Monday is 0)
      Julian day (day in the year, 1-366)
      DST (Daylight Savings Time) flag (-1, 0 or 1)
    If the DST flag is 0, the time is given in the regular time zone;
    if it is 1, the time is given in the DST time zone;
    if it is -1, mktime() should guess based on the date and time.

CLASSES
    builtins.tuple(builtins.object)
        struct_time
    
    class struct_time(builtins.tuple)
     |  struct_time(iterable=(), /)
.
.
.
.
.
.

>>> a = "test"
>>> help(a)
Help on package test:

NAME
    test - # Dummy file to make this directory a package.

PACKAGE CONTENTS
    __main__
    _test_multiprocessing
    ann_module
    ann_module2
    ann_module3
    audiotests
    autotest
    bad_coding
    bad_coding2
    bad_getattr
    bad_getattr2
    bad_getattr3
    badsyntax_3131
    badsyntax_future10
    badsyntax_future3
    badsyntax_future4
    badsyntax_future5
    badsyntax_future6
    badsyntax_future7
    badsyntax_future8
    badsyntax_future9
    badsyntax_pep3120
    bisect
    bytecode_helper
.
.
.
.
.
.

>>> help("ls")
No Python documentation found for ‘ls‘.
Use help() to get the interactive help utility.
Use help(str) for help on the str class.