python~type(获取变量类型)、help(某个函数或者类用法帮助文档) 、dir(类模块中可用函数)、查看文档 python

1.type（获取变量类型）

#encoding=utf-8b = "test"print(type(b)) #

脚本性语言，经常需要运行期间，来确定一个变量的类型，所以很常用。 2.help（某个函数或者类用法帮助文档）

#encoding=utf-8 import time print (help(time)) """ Help on module time:NAME time - This module provides various functions to manipulate time values.FILE /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/time.soMODULE DOCS http://docs.python.org/library/timeDESCRIPTION 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 (four digits, e.g. 1998) month (1-12) day (1-31) hours (0-23) ... """print (help(time.sleep))""" Help on built-in function sleep in module time:sleep(...) sleep(seconds)Delay execution for a given number of seconds.The argument may be a floating point number for subsecond precision. """

help(time)可以详细查看time类的详细文档，包括它里面都有那些函数，函数的用法介绍等。 help(time.sleep) 可以更加详细查看模块中函数的参数。 3.dir(类模块中可用函数)

import timeprint(dir(time))""" ['__doc__', '__file__', '__name__', '__package__', 'accept2dyear', 'altzone', 'asctime', 'clock', 'ctime', 'daylight', 'gmtime', 'localtime', 'mktime', 'sleep', 'strftime', 'strptime', 'struct_time', 'time', 'timezone', 'tzname', 'tzset'] """

可见，dir可以方便查询一个python模块，如time模块中，都有那些函数可以使用 4.查看python api文档