Python one line code dynamic load dependency

I met a lot of user feedback in an open source project a few days ago , No dependencies will be installed , Or perform pip install -r requirements.txt No response .

There are many possible causes , It's also troublesome to check one by one .

Want to solve this problem once and for all , Generally, everyone comes to site-packages Inside, guide out the required bags , Put it in the project root .

But it's too rough after all , Do not conform to the Python Elegant personality .

So I thought , Can you dynamically import packages , If not , Call again pip download . Finally, I almost realized my idea .

I probably checked , No one seems to have used this scheme now , It's very convenient for me to use , Share with you .

Although I want to make it library For everyone to download , Later, I thought that I had to rely on pip, Against the original intention of dynamic dependency So I recommend using Quick start - Inject code to run Ways in

Quick start

adopt pip Installation and operation

stay PyPI download dypend Dependency package

pip install dypend
​

Generate... Locally requirements.txt Dependency file

pip freeze > requirements.txt
​

Introduce... At the top level of the entry file of the project dypend , Don't change any other code

import dypend
​

At this time dypend Will check your Python Are there any in the environment requirements.txt In the package , without , dypend Would call pip download .

Inject code to run

Generate... Locally requirements.txt Dependency file

pip freeze > requirements.txt
​

Add the following code at the top of the entry file of the project , Don't change any other code

import os
import re
REQUIREMENTS = os.getcwd() + '/requirements.txt'
def getDepends():
requirements = open(REQUIREMENTS, 'r')
libs = requirements.readlines()
libList = []
for lib in libs:
try:
name = re.search("^.+(?===)", lib).group(0)
version = re.search("(?<===).+$", lib).group(0)
libDict = {
"name": name,
"version": version
}
libList.append(libDict)
except:
continue
return libList
def importLib():
"""Load python dependent libraries dynamically"""
​
libList = getDepends()
​
from pip._internal import main as pip_main
import importlib
​
def install(package):
pip_main(['install', package])
​
createVar = locals()
​
for lib in libList:
print(lib)
try:
createVar[lib["name"]] = importlib.import_module(lib["name"])
except Exception as e:
try:
install(f'{lib["name"]}=={lib["version"]}')
createVar[lib["name"]] = importlib.import_module(lib["name"])
except Exception as e:
print(e)
importLib()
​

At this time dypend Will check your Python Are there any in the environment requirements.txt In the package , without ,dypend Will automatically download .

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