python之错误 : Failure: ModuleNotFoundError (No module named 'flask_sqlalchemy' )

from flask import Flask, request, jsonify, make_response 
import json 
from flask_sqlalchemy import SQLAlchemy 
from datetime import datetime 

如上所述，我的 app.py 中有导入选项，代码在我的本地机器上运行良好，但在 travis 构建期间出现此错误:

    Traceback (most recent call last): 
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/nose/failure.py", line 39, in runTest 
    raise self.exc_val.with_traceback(self.tb) 
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/nose/loader.py", line 418, in loadTestsFromName 
    addr.filename, addr.module) 
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/nose/importer.py", line 47, in importFromPath 
    return self.importFromDir(dir_path, fqname) 
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/nose/importer.py", line 94, in importFromDir 
    mod = load_module(part_fqname, fh, filename, desc) 
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/imp.py", line 235, in load_module 
    return load_source(name, filename, file) 
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/imp.py", line 172, in load_source 
    module = _load(spec) 
  File "<frozen importlib._bootstrap>", line 684, in _load 
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked 
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module 
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed 
  File "/home/travis/build/Bonifase/WeConnect-/api/test_business.py", line 2, in <module> 
    import app 
  File "/home/travis/build/Bonifase/WeConnect-/api/app.py", line 3, in <module> 
    from flask_sqlalchemy import SQLAlchemy 
ModuleNotFoundError: No module named 'flask_sqlalchemy' 

请您参考如下方法:

请导入 Flask-SQLAlchemy