【原】pip install 依赖管理

全局安装依赖

pip install -r requirements.txt

本项目文件夹安装依赖

pip install -r requirements.txt -t .

eg:requirements.txt

asn1crypto==0.22.0        # via cryptography
attrs==17.2.0             # via automat, service-identity
Automat==0.6.0            # via twisted
certifi==2017.4.17        # via requests
cffi==1.10.0              # via cryptography
chardet==3.0.4            # via requests
constantly==15.1.0        # via twisted
cryptography==2.3.1         # via pyopenssl
cssselect==1.0.1          # via parsel, scrapy
enum34==1.1.6             # via cryptography
hyperlink==17.2.1         # via twisted
idna==2.5                 # via cryptography, requests
incremental==17.5.0       # via twisted
ipaddress==1.0.18         # via cryptography
lxml==3.8.0               # via parsel, scrapy
parsel==1.2.0             # via scrapy
pyasn1-modules==0.0.9     # via service-identity
pyasn1==0.2.3             # via pyasn1-modules, service-identity
pycparser==2.17           # via cffi
PyDispatcher==2.0.5       # via scrapy
pymongo==3.4.0
pyopenssl==17.0.0         # via scrapy, service-identity
queuelib==1.4.2           # via scrapy
requests==2.18.1
Scrapy==1.4.0
service-identity==17.0.0  # via scrapy
six==1.10.0               # via automat, cryptography, parsel, pyopenssl, scrapy, w3lib
Twisted==17.5.0           # via scrapy
urllib3==1.21.1           # via requests
w3lib==1.17.0             # via parsel, scrapy
zope.interface==4.4.2     # via twisted