核心命令：python -m pydoc
查询某包：python -m pydoc 包名
示例：
C:\Users\xxx>python -m pydoc
pydoc - the Python documentation tool pydoc <name> ...
Show text documentation on something. <name> may be the name of a
Python keyword, topic, function, module, or package, or a dotted
reference to a class or function within a module or module in a
package. If <name> contains a '\', it is used as the path to a
Python source file to document. If name is 'keywords', 'topics',
or 'modules', a listing of these things is displayed. pydoc -k <keyword>
Search for a keyword in the synopsis lines of all available modules. pydoc -p <port>
Start an HTTP server on the given port on the local machine. Port
number 0 can be used to get an arbitrary unused port. pydoc -b
Start an HTTP server on an arbitrary unused port and open a Web browser
to interactively browse documentation. The -p option can be used with
the -b option to explicitly specify the server port. pydoc -w <name> ...
Write out the HTML documentation for a module to a file in the current
directory. If <name> contains a '\', it is treated as a filename; if
it names a directory, documentation is written for all the contents. C:\Users\xxx>python -m pydoc xlrd
Help on package xlrd: NAME
xlrd DESCRIPTION
# Copyright (c) 2005-2012 Stephen John Machin, Lingfo Pty Ltd
# This module is part of the xlrd package, which is released under a
# BSD-style licence. PACKAGE CONTENTS
biffh
book
compdoc
formatting
formula
info
sheet
timemachine
xldate
xlsx FUNCTIONS
count_records(filename, outfile=<_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf-8'>)
For debugging and analysis: summarise the file's BIFF records.
ie: produce a sorted file of ``(record_name, count)``. :param filename: The path to the file to be summarised.
:param outfile: An open file, to which the summary is written. dump(filename, outfile=<_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf-8'>, unnumbered=False)
For debugging: dump an XLS file's BIFF records in char & hex. :param filename: The path to the file to be dumped.
:param outfile: An open file, to which the dump is written.
:param unnumbered: If true, omit offsets (for meaningful diffs). open_workbook(filename=None, logfile=<_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf-8'>, verbosity=0, use_mmap=1, file_contents=None, encoding_override=None, formatting_info=False, on_demand=False, ragged_rows=False)
Open a spreadsheet file for data extraction. :param filename: The path to the spreadsheet file to be opened. :param logfile: An open file to which messages and diagnostics are written. :param verbosity: Increases the volume of trace material written to the
logfile. :param use_mmap: Whether to use the mmap module is determined heuristically.
Use this arg to override the result. Current heuristic: mmap is used if it exists. :param file_contents: A string or an :class:`mmap.mmap` object or some other behave-alike
object. If ``file_contents`` is supplied, ``filename`` will not be used,
except (possibly) in messages. :param encoding_override: Used to overcome missing or bad codepage information
in older-version files. See :doc:`unicode`. :param formatting_info: The default is ``False``, which saves memory.
In this case, "Blank" cells, which are those with their own formatting
information but no data, are treated as empty by ignoring the file's
``BLANK`` and ``MULBLANK`` records.
This cuts off any bottom or right "margin" of rows of empty or blank
cells.
Only :meth:`~xlrd.sheet.Sheet.cell_value` and
:meth:`~xlrd.sheet.Sheet.cell_type` are available. When ``True``, formatting information will be read from the spreadsheet
file. This provides all cells, including empty and blank cells.
Formatting information is available for each cell. Note that this will raise a NotImplementedError when used with an
xlsx file. :param on_demand: Governs whether sheets are all loaded initially or when demanded
by the caller. See :doc:`on_demand`. :param ragged_rows: The default of ``False`` means all rows are padded out with empty cells so
that all rows have the same size as found in
:attr:`~xlrd.sheet.Sheet.ncols`. ``True`` means that there are no empty cells at the ends of rows.
This can result in substantial memory savings if rows are of widely
varying sizes. See also the :meth:`~xlrd.sheet.Sheet.row_len` method. :returns: An instance of the :class:`~xlrd.book.Book` class. DATA
FMLA_TYPE_ARRAY = 4
FMLA_TYPE_CELL = 1
FMLA_TYPE_COND_FMT = 8
FMLA_TYPE_DATA_VAL = 16
FMLA_TYPE_NAME = 32
FMLA_TYPE_SHARED = 2
MMAP_AVAILABLE = 1
-- More --