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How to stop Flask from initialising twice in Debug Mode? [duplicate]
When building a Flask service in Python and setting the debug mode on, the Flask service will initialise twice. When the initialisation loads caches and the like, this can take a while. Having to do this twice is annoying when in development (debug) mode. When debug is off, the Flask service only in...
Local (?) variable referenced before assignment [duplicate]
...
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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.
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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]
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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'
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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 define hash tables in Bash?
What is the equivalent of Python dictionaries but in Bash (should work across OS X and Linux).
15 Answers
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How can I make pandas dataframe column headers all lowercase?
...ned method call, you can use
data.rename(
columns=unicode.lower
)
(Python 2)
or
data.rename(
columns=str.lower
)
(Python 3)
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