小编Kur*_*eek的帖子

我想编写一个shell脚本来检查某个文件archived_sensor_data.json是否存在,如果存在,则删除它.在http://www.cyberciti.biz/tips/find-out-if-file-exists-with-conditional-expressions.html之后,我尝试了以下方法:

[-e archived_sensor_data.json] && rm archived_sensor_data.json

但是,这会引发错误

[-e: command not found

当我尝试test_controller使用该./test_controller命令运行生成的脚本时.代码有什么问题？

我有一个apkmirror-scraper-compose具有以下结构的目录:

.
??? docker-compose.yml
??? privoxy
?   ??? config
?   ??? Dockerfile
??? scraper
?   ??? Dockerfile
?   ??? newnym.py
?   ??? requirements.txt
??? tor
    ??? Dockerfile

我正在尝试运行以下内容docker-compose.yml:

version: '3'

services:
  privoxy:
    build: ./privoxy
    ports:
      - "8118:8118"
    links:
      - tor

  tor:
    build:
      context: ./tor
      args:
        password: ""
    ports:
      - "9050:9050"
      - "9051:9051"

  scraper:
    build: ./scraper
    links:
      - tor
      - privoxy

其中,Dockerfile用于tor为

FROM alpine:latest
EXPOSE 9050 9051
ARG password
RUN apk --update add …

有人可以解释一下如何在当前数据库中获取表格吗？

我正在使用postgresql-8.4 psycopg2.

我最近从Enthought Canopy Python发行版改为Anaconda,其中包括Spyder IDE.

在Canopy的代码编辑器中,可以通过按"Cntrl + /"快捷键序列来注释和取消注释代码行.在Spyder中,我无法在入门教程中找到等效的快捷键.

是否有一个快捷键用于在Spyder中注释和取消注释代码？

我有一个只包含两个文件的目录,Dockerfile并且sayhello.sh:

.
??? Dockerfile
??? sayhello.sh

在Dockerfile读

FROM alpine
COPY sayhello.sh sayhello.sh
CMD ["sayhello.sh"]

并且sayhello.sh包含简单

echo hello

在Dockerfile成功生成:

kurtpeek@Sophiemaries-MacBook-Pro ~/d/s/trybash> docker build --tag trybash .
Sending build context to Docker daemon 3.072 kB
Step 1/3 : FROM alpine
 ---> 665ffb03bfae
Step 2/3 : COPY sayhello.sh sayhello.sh
 ---> Using cache
 ---> fe41f2497715
Step 3/3 : CMD sayhello.sh
 ---> Using cache
 ---> dfcc26c78541
Successfully built dfcc26c78541

但是,如果我尝试run它,我会收到一个executable file not …

我刚刚创建了一个个人GitLab帐户,并尝试按照这些步骤进行操作

https://gitlab.com/help/ssh/README

将我的SSH密钥部署到GitLab.我已完成第5步,并在我的用户设置 - > SSH密钥中的"您的SSH密钥"中查看我的SSH密钥:

我正在尝试完成可选的第6步,测试密钥:

我的GitLab用户名是khpeek,所以我猜测我的'GitLab域'是gitlab.com/khpeek.但是,测试命令

ssh -T git@gitlab.com/khpeek

产生错误消息:

ssh: Could not resolve hostname gitlab.com/khpeek: Name or service not known

显然这是错误的主机名.什么是正确的？

我正在尝试关注Selenium的教程,http://selenium-python.readthedocs.io/getting-started.html.我已下载最新版本geckodriver并将其复制到/usr/local/bin.但是,当我尝试

from selenium import webdriver
driver = webdriver.Firefox()

我收到以下错误消息:

Traceback (most recent call last):
  File "/Users/kurtpeek/Documents/Scratch/selenium_getting_started.py", line 4, in <module>
    driver = webdriver.Firefox()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/firefox/webdriver.py", line 152, in __init__
    keep_alive=True)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 98, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 188, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 252, in execute
    self.error_handler.check_response(response)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 194, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: Unable to find a matching set of …

Python模块的uuid4()函数uuid生成一个随机UUID,并且似乎每次生成一个不同的UUID:

In [1]: import uuid

In [2]: uuid.uuid4()
Out[2]: UUID('f6c9ad6c-eea0-4049-a7c5-56253bc3e9c0')

In [3]: uuid.uuid4()
Out[3]: UUID('2fc1b6f9-9052-4564-9be0-777e790af58f')

我希望每次运行脚本时都能生成相同的随机UUID - 也就是说,我想将随机生成器播种到uuid4().有没有办法做到这一点？(或通过其他方式实现这一点)？

到目前为止我尝试过的

我将使用uuid.UUID()带有随机128位整数(来自种子实例random.Random())的方法生成UUID 作为输入:

import uuid
import random

rd = random.Random()
rd.seed(0)
uuid.UUID(rd.getrandbits(128))

但是,UUID()似乎不接受这个作为输入:

Traceback (most recent call last):
  File "uuid_gen_seed.py", line 6, in <module>
    uuid.UUID(rd.getrandbits(128))
  File "/usr/lib/python2.7/uuid.py", line 133, in __init__
    hex = hex.replace('urn:', '').replace('uuid:', '')
AttributeError: 'long' object has no attribute 'replace'

还有其他建议吗？

考虑以下Pytest:

import pytest

class TimeLine(object):
    instances = [0, 1, 2]

@pytest.fixture
def timeline():
    return TimeLine()

def test_timeline(timeline):
    for instance in timeline.instances:
        assert instance % 2 == 0

if __name__ == "__main__":
    pytest.main([__file__])

该测试test_timeline使用Pytest fixture timeline,它本身具有该属性instances.此属性在测试中迭代,因此只有断言适用于每个输入时instance,测试才会通过timeline.instances.

然而,我真正想要做的是生成3个测试,其中2个应该通过,其中1个将失败.我试过了

@pytest.mark.parametrize("instance", timeline.instances)
def test_timeline(timeline):
    assert instance % 2 == 0

但这会导致

AttributeError: 'function' object has no attribute 'instances'

据我了解,在Pytest灯具中,函数"变为"它的返回值,但在测试参数化时,这似乎还没有发生.如何以理想的方式设置测试？

我正在尝试在基于python:alpine的Docker容器中运行Python的Scrapy .它以前工作过,但现在我想使用Scrapy的Image Pipeline,它需要我安装Pillow.

作为简化示例,我尝试了以下方法Dockerfile:

FROM python:alpine
RUN apk --update add libxml2-dev libxslt-dev libffi-dev gcc musl-dev libgcc openssl-dev curl
RUN apk add libjpeg zlib tiff freetype lcms libwebp tcl openjpeg
RUN pip install Pillow

但是,当我尝试构建它时,我得到一个错误,其中包含以下内容:

Traceback (most recent call last):
  File "/tmp/pip-build-ft5yzzuv/Pillow/setup.py", line 744, in <module>
    zip_safe=not debug_build(), )
  File "/usr/local/lib/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/local/lib/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/local/lib/python3.6/site-packages/setuptools/command/install.py", line 61, in …