大约有 40,000 项符合查询结果（耗时：0.0415秒） [XML]
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 ...
How to make lists contain only distinct element in Python? [duplicate]
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i am wrong or with python3k the values will be preserved, cause set now are sorted?
– Ant
Dec 16 '10 at 10:32
2
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How to source virtualenv activate in a Bash script
...e script_name
#!/bin/bash -x
PWD=`pwd`
/usr/local/bin/virtualenv --python=python3 venv
echo $PWD
activate () {
. $PWD/venv/bin/activate
}
activate
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What is a Python equivalent of PHP's var_dump()? [duplicate]
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Note: For python3 you'll need to use parens like print( vars(foo) )
– Armstrongest
Apr 3 '19 at 3:23
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How do I determine if my python shell is executing in 32bit or 64bit?
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so copy-paste oneliner for Python3: python -c "import struct; print(struct.calcsize('P')*8)"
– Neinstein
Jul 2 '19 at 13:38
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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 to urlencode a querystring in Python?
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python3 -c "import urllib.parse, sys; print(urllib.parse.quote_plus(sys.argv[1])) "string to encode" for a one liner on the command line
– Amos Joshua
May 8 '19 at 12:19
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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...
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' + ...
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):
...