小编Ali*_*aki的帖子

我正在尝试导入requests模块,但是我得到了这个错误,我的python版本是在ubuntu 14.04上运行的3.4

>>> import requests
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/requests/packages/urllib3/connectionpool.py", line 10, in <module>
    from queue import LifoQueue, Empty, Full
ImportError: cannot import name 'LifoQueue'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.4/dist-packages/requests/__init__.py", line 58, in <module>
   from . import utils
  File "/usr/local/lib/python3.4/dist-packages/requests/utils.py", line 26, in <module>
    from .compat import parse_http_list as _parse_list_header
  File "/usr/local/lib/python3.4/dist-packages/requests/compat.py", line 7, in <module>
    from .packages import …

我正在使用Flask和flask-Bcrypt完成一个简单的用户登录.但是,当尝试使用存储在我的数据库中的用户登录时,我不断收到此错误

ValueError: Invalid salt

models.py

class User(db.Model):

    __tablename__ = "users"

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String, nullable=False)
    email = db.Column(db.String, nullable=False)
    password = db.Column(db.String, nullable=False)
    posts = db.relationship("Post", backref="author", lazy="dynamic")

    def __init__(self, name, email, password):
        self.name = name
        self.email = email
        self.password = bcrypt.generate_password_hash(password)

    def __repr__(self):
        return '<User {}>'.format(self.name)

views.py

@app.route("/login", methods=["GET", "POST"])
def login():
    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter(User.name == form.username.data).first()
        if user and bcrypt.check_password_hash(user.password, form.password.data):
            flash("you were just logged in!")
            login_user(user)
            return redirect(url_for("home"))
        else: …

我试图构建kivy应用程序到Android并得到此错误

# Check configuration tokens
# Ensure build layout
# Check configuration tokens
# Preparing build
# Check requirements for android
# Install platform
# Apache ANT found at /home/ali/.buildozer/android/platform/apache-ant-1.9.4
# Android SDK is missing, downloading
# Unpacking Android SDK
# Command failed: tar xzf android-sdk_r20-linux.tgz
# 
# Buildozer failed to execute the last command
# If the error is not obvious, please raise the log_level to 2
# and retry the latest command.
# In case of a bug …

所以我有一个需要很长时间才能完成的函数我想知道如何为该函数制作进度条，代码如下所示

def some_function():
    #do something
    #do something
    #do something
    print('finished')

输出

[==========         ] 40%
[==============     ] 60%
[=================  ] 80%
finished
[===================] 100%

如果能在同一个地方更新就好了

我试过这个代码：

import os
os.system("gsettings set org.gnome.desktop.background picture-uri file:///home/user/Pictures/wallpapers/X")

user我的名字和X照片在哪里。

但是它没有将背景更改为给定图片，而是设置了默认的 Ubuntu 壁纸。

我究竟做错了什么？