因?qū)ython的爬蟲(chóng)技術(shù)比較感興趣，所以想搗鼓下。
網(wǎng)上瀏覽了下，發(fā)現(xiàn)scrapy爬蟲(chóng)框架用的挺多的，所以自己也安裝下，安裝后執(zhí)行scrapy時(shí)，提示command not found。

環(huán)境說(shuō)明：
mac catalina 系統(tǒng)
python環(huán)境為3.7版本
pip3的版本：19.1.3

操作步驟：
1、pip3 install Scrapy （安裝成功，無(wú)報(bào)錯(cuò)日志信息）
2、執(zhí)行 scrapy ，返回提示信息 command not found

經(jīng)網(wǎng)上搜尋資料發(fā)現(xiàn)，需要?jiǎng)?chuàng)建軟連接：
本機(jī)python3.7的安裝路徑為：/Library/Frameworks/Python.framework/Versions/3.7/bin/scrapy

解決方案為：
執(zhí)行：ln -s /Library/Frameworks/Python.framework/Versions/3.7/bin/scrapy /usr/local/bin/scrapy

上述命令執(zhí)行后在命令行輸入：scrapy，返回信息如下：
Scrapy 1.7.4 - no active project

Usage:
scrapy <command> [options] [args]

Available commands:
bench Run quick benchmark test
fetch Fetch a URL using the Scrapy downloader
genspider Generate new spider using pre-defined templates
runspider Run a self-contained spider (without creating a project)
settings Get settings values
shell Interactive scraping console
startproject Create new project
version Print Scrapy version
view Open URL in browser, as seen by Scrapy

[ more ] More commands available when run from project directory

Use "scrapy <command> -h" to see more info about a command

image.png

至此解決問(wèn)題。