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App Inventor 2 中文网 · 升级日志
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MQTT相关知识研究笔记 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...tps://blog.csdn.net/xiaolong11 ... e/details/134280836
Mosquitto 安装包下载：https://mosquitto.org/download/
2、与Node-RED有啥区别？Node-RED 是一种编程工具，用于以新颖有趣的方式将硬件设备、API 和在线服务连接在一起。
Node-RED 是一个流程化的...
TaifunFlashlight 手电筒/闪光灯拓展 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...灯
过程
打开闪光灯
关闭闪光灯
示例程序
.aix 下载：
为什么条码扫描器开始工作时，通过taifunflashlight打开的手电筒就自动关闭了，能否在条码扫描器工作的同时手电筒也能同时工作？这样在黑暗的地方扫码时...
Create a “with” block on several context managers? [duplicate]
...owing how many mangers are there in the array. will it be possible in some python3.X to do with [cm1,cm2,cm3,cm4,cm5] as result: ....
– olamundo
Jun 11 '10 at 17:50
2
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filename and line number of python script
...
Thanks to mcandre, the answer is:
#python3
from inspect import currentframe, getframeinfo
frameinfo = getframeinfo(currentframe())
print(frameinfo.filename, frameinfo.lineno)
share
...
Replace console output in Python
... expected time of finishing. Super useful and quick. Works for python2 and python3.
share
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improve this answer
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How can I read large text files in Python, line by line, without loading it into memory?
...d using line by line reading and writing. It's CRAZY FAST.
#!/usr/bin/env python3.6
import sys
with open(sys.argv[2], 'w') as outfile:
with open(sys.argv[1]) as infile:
for line in infile:
outfile.write(line)
...
Choosing a file in Python with simple Dialog
... @WestAce yes, it was changed from "Tkinter" to "tkinter" for Python3
– Ben
Jul 19 '18 at 0:26
1
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How to validate a url in Python? (Malformed or not)
...nswer:
try:
# python2
from urlparse import urlparse
except:
# python3
from urllib.parse import urlparse
a = 'http://www.cwi.nl:80/%7Eguido/Python.html'
b = '/data/Python.html'
c = 532
d = u'dkakasdkjdjakdjadjfalskdjfalk'
def uri_validator(x):
try:
result = urlparse(x)
...
Why do Python's math.ceil() and math.floor() operations return floats instead of integers?
...he result of floor/ceil to be a float instead of an integer. The fact that python3 does return integers shows that this is in fact the more useful thing to do. I don't buy the "the point of..." claim; it seems that you're defining the point based on what it does, rather than what a programmer might ...