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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
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示例程序
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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...
What is a Python equivalent of PHP's var_dump()? [duplicate]
...
Note: For python3 you'll need to use parens like print( vars(foo) )
– Armstrongest
Apr 3 '19 at 3:23
...
Saving a Numpy array as an image
...rite_png(buf, width, height):
""" buf: must be bytes or a bytearray in Python3.x,
a regular string in Python2.x.
"""
import zlib, struct
# reverse the vertical line order and add null bytes at the start
width_byte_4 = width * 4
raw_data = b''.join(
b'\x00' + ...
Getting MAC Address
... getHwAddr('eth0')
This is the Python 3 compatible code:
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import fcntl
import socket
import struct
def getHwAddr(ifname):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
info = fcntl.ioctl(s.fileno(), 0x8927, struct.pack('256s', bytes...
How to make an unaware datetime timezone aware in python
...Fewer dependencies and no pytz issues.
NOTE: If you wish to use this with python3 and python2, you can use this as well for the timezone import (hardcoded for UTC):
try:
from datetime import timezone
utc = timezone.utc
except ImportError:
#Hi there python2 user
class UTC(tzinfo):
...
UnicodeDecodeError: 'utf8' codec can't decode byte 0x9c
...above worked for me.
http://python-notes.curiousefficiency.org/en/latest/python3/text_file_processing.html
In short, to make Python 3 behave as similarly as possible to Python 2 use:
with open(filename, encoding="latin-1") as datafile:
# work on datafile here
However, read the article, the...
Concatenating two lists - difference between '+=' and extend()
... That's right. But at least you can use nonlocal l statement in boo in Python3.
– monitorius
Jul 2 '15 at 9:58
com...
Ubuntu running `pip install` gives error 'The following required packages can not be built: * freety
...o apt-get install python-matplotlib
For python 3.x
sudo apt-get install python3-matplotlib
After installing, you can try
(sudo) pip install matplotlib
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How do I format a string using a dictionary in python-3.x?
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I would say that use of the f-string is more aligned to python3 approach.
– Jonatas CD
May 25 '18 at 12:00
2
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How to find the mime type of a file in python?
...a different name:
pip3 install --user python-magic
# or:
sudo apt install python3-magic # Ubuntu distro package
The code can be simplified as well:
>>> import magic
>>> magic.from_file('/tmp/img_3304.jpg', mime=True)
'image/jpeg'
...