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Automatically creating directories with file output [duplicate]
...d the os.makedirs calls, so that to protect us from race conditions.
In Python 3.2+, there is a more elegant way that avoids the race condition above:
import os
filename = "/foo/bar/baz.txt"
os.makedirs(os.path.dirname(filename), exist_ok=True)
with open(filename, "w") as f:
f.write("FOOBAR...
How to convert a date string to different format [duplicate]
I need to convert date string "2013-1-25" to string "1/25/13" in python.
I looked at the datetime.strptime but still can't find a way for this.
...
Get filename from file pointer [duplicate]
...')
>>> os.path.basename(f.name)
'bar.txt'
File object docs (for Python 2) here.
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Remove final character from string [duplicate]
...
What you are trying to do is an extension of string slicing in Python:
Say all strings are of length 10, last char to be removed:
>>> st[:9]
'abcdefghi'
To remove last N characters:
>>> N = 3
>>> st[:-N]
'abcdefg'
...
Google breakpad stackwalker无法加载符号 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...径有要求，GUID来自 .so 文件的头部。
为了方便，写个 python 脚本 gen_symbols.py 自动生成：
#!/usr/bin/python
import sys
import getopt
import os
import errno
from os.path import basename
def make_sure_path_exists(path):
try:
os.makedirs(path)
...
scrapyd 转入后台daemon守护模式运行的方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...BIN="/usr/local/bin/scrapyd"
pid=`netstat -lnopt | grep :$PORT | awk '/python/{gsub(/\/python/,"",$7);print $7;}'`
start() {
if [ -n "$pid" ]; then
echo "server already start,pid:$pid"
return 0
fi
cd $HOME
nohup $BIN >> $HOME/scrapyd.log 2>&1 &
echo "start a...
How to run Django's test database only in memory?
...create a separate settings file for tests and use it in test command e.g.
python manage.py test --settings=mysite.test_settings myapp
It has two benefits:
You don't have to check for test or any such magic word in sys.argv, test_settings.py can simply be
from settings import *
# make tests f...
How to count total lines changed by a specific author in a Git repository?
...em install git_fame
cd /path/to/gitdir && git fame
There is also Python version at https://github.com/casperdcl/git-fame (mentioned by @fracz):
sudo apt-get install python-pip python-dev build-essential
pip install --user git-fame
cd /path/to/gitdir && git fame
Sample output:
...
How to get a reference to a module inside the module itself?
...ler:
current_module = __import__(__name__)
Be aware there is no import. Python imports each module only once.
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Lock, mutex, semaphore… what's the difference?
...gle process. This depends on the pshared argument provided to sem_init.
python (threading.py)
A lock (threading.RLock) is mostly the same as C/C++ pthread_mutex_ts. Both are both reentrant. This means they may only be unlocked by the same thread that locked it. It is the case that sem_t semapho...