How to print variables without spaces between values

This question already has an answer here: How to print without newline or space? 26 answers Don't use print ..., if you don't want spaces. Use string concatenation or formatting. Concatenation: print 'Value is "' + str(value) + '"' Formatting: print 'Value is "{}"'.format(value) The latter is far more flexible, see the str.format() method documentation and the Formatting Strin

如何在值之间没有空格的情况下打印变量

这个问题在这里已经有了答案: 如何在没有换行符或空格的情况下打印? 26个答案 如果你不想使用空格print ...,请不要使用print ..., 使用字符串连接或格式。 级联: print 'Value is "' + str(value) + '"' 格式: print 'Value is "{}"'.format(value) 后者更加灵活,请参阅str.format()方法文档和Formatting String Syntax部分。 您还将遇到老%格式样式: print 'Value is "%d"' % value print 'Value is "%d",

Python: avoid new line with print command

This question already has an answer here: How to print without newline or space? 26 answers In Python 3.x , you can use the end argument to the print() function to prevent a newline character from being printed: print("Nope, that is not a two. That is a", end="") In Python 2.x , you can use a trailing comma: print "this should be", print "on the same line" You don't need this to simp

Python:避免使用打印命令的新行

这个问题在这里已经有了答案: 如何在没有换行符或空格的情况下打印? 26个答案 在Python 3.x中 ,可以使用print()函数的end参数来防止输出换行符: print("Nope, that is not a two. That is a", end="") 在Python 2.x中 ,您可以使用尾随逗号: print "this should be", print "on the same line" 不过,您不需要这样简单地打印一个变量: print "Nope, that is not a two. That is a", x 请注意,尾部的逗号仍然会

How do I keep Python print from adding newlines or spaces?

This question already has an answer here: How to print without newline or space? 26 answers 您可以使用: sys.stdout.write('h') sys.stdout.write('m') Just a comment. In Python 3, you will use print('h', end='') to suppress the endline terminator, and print('a', 'b', 'c', sep='') to suppress the whitespace separator between items. Greg is right-- you can use sys.stdout.write Perhaps,

如何保持Python打印不添加换行符或空格?

这个问题在这里已经有了答案: 如何在没有换行符或空格的情况下打印? 26个答案 您可以使用: sys.stdout.write('h') sys.stdout.write('m') 只是一个评论。 在Python 3中,您将使用 print('h', end='') 压制终结者终结者,并且 print('a', 'b', 'c', sep='') 禁止项目之间的空白分隔符。 Greg是对的 - 你可以使用sys.stdout.write 不过,也许你应该考虑重构你的算法来积累<whatevers>列表,然后 lst = ['h'

Disable output buffering

Is output buffering enabled by default in Python's interpreter for sys.stdout ? If the answer is positive, what are all the ways to disable it? Suggestions so far: Use the -u command line switch Wrap sys.stdout in an object that flushes after every write Set PYTHONUNBUFFERED env var sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0) Is there any other way to set some gl

禁用输出缓冲

Python的sys.stdout解释器默认启用输出缓冲吗? 如果答案是肯定的,那么禁用它的所有方法是什么? 迄今为止的建议: 使用-u命令行开关 将sys.stdout包装在每次写入后刷新的对象中 设置PYTHONUNBUFFERED env var sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0) 是否有任何其他方式来在执行过程中以编程方式在sys / sys.stdout设置全局标志? 来自Magnus Lycka邮件列表上的答案: 您可以使用“pyt

How do I run Python code from Sublime Text 2?

I want to set up a complete Python IDE in Sublime Text 2. I want to know how to run the Python code from within the editor. Is it done using build system? How do I do it ? Tools -> Build System -> (choose) Python then: To Run: Tools -> Build -or- Ctrl + B CMD + B (OSX) This would start your file in the console which should be at the bottom of the edi

如何从Sublime Text 2运行Python代码?

我想在Sublime Text 2中设置一个完整的Python IDE。 我想知道如何从编辑器中运行Python代码。 它是使用构建系统完成的吗? 我该怎么做 ? 工具 - >构建系统 - >(选择)然后Python: 跑步: Tools -> Build -or- Ctrl + B CMD + B (OSX) 这将在应该在编辑器底部的控制台中启动您的文件。 停止: Ctrl + Break or Tools -> Cancel Build Fn + C (OSX) 你可

Run a python script from another python script, passing in args

This question already has an answer here: What is the best way to call a Python script from another Python script? 8 answers Try using os.system : os.system("script2.py 1") execfile is different because it is designed to run a sequence of Python statements in the current execution context. That's why sys.argv didn't change for you. This is inherently the wrong thing to do. If y

从另一个python脚本运行一个python脚本,传入参数

这个问题在这里已经有了答案: 从另一个Python脚本调用Python脚本的最佳方式是什么? 8个答案 尝试使用os.system : os.system("script2.py 1") execfile是不同的,因为它被设计为在当前执行上下文中运行一系列Python语句。 这就是为什么sys.argv不会改变你。 这本质上是错误的。 如果您从另一个Python脚本运行Python脚本,则应该通过Python而不是通过操作系统进行通信: import script1 在理想的世界中,您将能够

Run a linux system command as a superuser, using a python script

I have got postfix installed on my machine and I am updating virtual_alias on the fly programmatically(using python)(on some action). Once I update the entry in the /etc/postfix/virtual_alias, I am running the command: sudo /usr/sbin/postmap /etc/postfix/virtual_alias 2>>/work/postfix_valias_errorfile But I am getting the error: sudo: sorry, you must have a tty to run sudo I want to run the me

使用python脚本以超级用户身份运行linux系统命令

我已经在我的机器上安装了postfix,并且正在以编程方式更新virtual_alias(使用python)(在某些操作上)。 一旦我更新/ etc / postfix / virtual_alias中的条目,我正在运行命令: sudo /usr/sbin/postmap /etc/postfix/virtual_alias 2>>/work/postfix_valias_errorfile 但是我收到错误: sudo: sorry, you must have a tty to run sudo 我想以非人为的方式运行提到的sudo命令(也就是说,我正在从python脚本运行此系统命令

can't capture image by raspberry pi camera in python

I have a problem when trying to take an image with a Raspberry Pi camera. When I execute this code: import sys sys.path.append('/usr/local/lib/python3.4/site-packages') import cv2 import numpy as np import detect cap = cv2.VideoCapture(0) while(True): ret, frame = cap.read() img = detect.detect(frame) cv2.imshow('frame',img) if cv2.waitKey(1) & 0xFF == ord('q'):

在python中无法通过树莓派相机捕捉图像

尝试使用Raspberry Pi相机拍摄图像时出现问题。 当我执行此代码时: import sys sys.path.append('/usr/local/lib/python3.4/site-packages') import cv2 import numpy as np import detect cap = cv2.VideoCapture(0) while(True): ret, frame = cap.read() img = detect.detect(frame) cv2.imshow('frame',img) if cv2.waitKey(1) & 0xFF == ord('q'): break cap.release() 我收到错误: T

Preview fswebcam image as it takes picture

I am currently using a USB webcam with a Raspberry Pi 3. At the moment as part of a lot of other code in Python it takes a picture using the camera and saves it to a specific directory. I was wondering whether there was any way of getting a preview of the image to show up on screen, similarly to how the picamera works: camera.start_preview() time.sleep(5) camera.capture('/home/pi/Downloads

在拍摄照片时预览fswebcam图像

目前,我正在使用带有Raspberry Pi 3的USB摄像头。目前,作为Python中其他代码的一部分,它使用相机拍摄一张照片并将其保存到特定目录。 我想知道是否有任何方法让图像的预览显示在屏幕上,类似于picamera的工作原理: camera.start_preview() time.sleep(5) camera.capture('/home/pi/Downloads/image.jpg') camera.stop_preview() 有没有相当于这个使用fswebcam? 获取图像的部分代码是: from subprocess impo

Raspberry Pi: terminate raspistill command from python

I'm trying to use a PHP file on a server to transmit some variables into a Python script which will in turn start a raspistill timelapse on my Raspberry Pi. I've so far managed to start taking pictures but I'd now like to have a button to kill the timelapse - i've tried many methods including .kill() and .terminate() but cant get it working. Here is my current python code: im

Raspberry Pi:终止来自python的raspistill命令

我试图在服务器上使用PHP文件来将一些变量传输到Python脚本中,然后在我的Raspberry Pi上启动一个简单的时间间隔。 我到目前为止设法开始拍照,但我现在想要有一个按钮来杀死timelapse - 我已经尝试了许多方法,包括.kill()和.terminate(),但无法让它工作。 这是我目前的Python代码: import sys, os, time, datetime import subprocess import signal from time import sleep tlfreq = int(sys.argv[1]) tltime = in