所以我试图为我的烧瓶应用程序设置 pybuilder 并且由于某种原因，它没有安装依赖项？当我运行'pyb install_dependencies'时它显示了这一点
PyBuilder version 0.11.10
Build started at 2017-07-17 11:57:23
------------------------------------------------------------
[INFO] Building flask-example version 0.1.2
[INFO] Executing build in /home/aalred/flask-example
[INFO] Going to execute task install_dependencies
[INFO] Installing all dependencies
[INFO] Processing batch dependency 'coverage'
[INFO] Processing batch dependency 'pyassert'
[INFO] Processing batch dependency 'pyfix'
[INFO] Processing batch dependency 'flask'
------------------------------------------------------------
BUILD SUCCESSFUL
------------------------------------------------------------
但是当我执行命令时：
python hello.py
我收到以下错误：
from flask import Flask, render_template
ImportError: No module named flask
有人可以解释发生了什么吗？这让我很困惑，我似乎找不到一个直截了当的答案。
如果这也有帮助，这是我的 build.py：
from pybuilder.core import init, use_plugin
use_plugin("python.core")
use_plugin("python.install_dependencies")
#use_plugin("python.unittest")
default_task = ['install_dependencies', 'publish']
@init
def initialize(project):
project.build_depends_on('pyfix')
project.build_depends_on('pyassert')
project.depends_on('flask')
project.depends_on('flask-mysql')