python中查看第三方库的版本号

（1）方法一

import scrapy
scrapy.__version__
Out[13]: '1.5.1'

（2）方法二

help(scrapy)
Help on package scrapy:
NAME
    scrapy - Scrapy - a web crawling and web scraping framework written for Python
PACKAGE CONTENTS
    __main__
    _monkeypatches
    cmdline
    command
    commands (package)
    conf
    contracts (package)
    contrib (package)
    contrib_exp (package)
    core (package)
    crawler
    downloadermiddlewares (package)
    dupefilter
    dupefilters
    exceptions
    exporters
    extension
    extensions (package)
    http (package)
    interfaces
    item
    link
    linkextractor
    linkextractors (package)
    loader (package)
    log
    logformatter
    mail
    middleware
    pipelines (package)
    project
    resolver
    responsetypes
    selector (package)
    settings (package)
    shell
    signalmanager
    signals
    spider
    spiderloader
    spidermanager
    spidermiddlewares (package)
 ...