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搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
.../single/data
#进入mongodb文件夹
cd /data/mongodbtest/single
2、下载mongodb的安装程序包
wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.6.tgz
#解压下载的压缩包
tar xvzf mongodb-linux-x86_64-2.4.6.tgz
#进入mongodb程序执行文件夹
cd mongodb...
How can I detect if a file is binary (non-text) in python?
...n', 'rb').read(1024))
True
>>> is_binary_string(open('/usr/bin/dh_python3', 'rb').read(1024))
False
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read subprocess stdout line by line
... vs. for line in file see bugs.python.org/issue3907 (in short: it works on Python3; use io.open() on Python 2.6+)
– jfs
Jan 23 '12 at 11:16
5
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Iterating over dictionaries using 'for' loops
...ticular order, as you can see here:
Edit: (This is no longer the case in Python3.6, but note that it's not guaranteed behaviour yet)
>>> d = {'x': 1, 'y': 2, 'z': 3}
>>> list(d)
['y', 'x', 'z']
>>> d.keys()
['y', 'x', 'z']
For your example, it is a better idea to use...
Find current directory and file's directory [duplicate]
... pass
with open(str(p)) as f: pass
with open(p) as f: pass
print('OK')
$ python3.5 scripts/2.py
Traceback (most recent call last):
File "scripts/2.py", line 11, in <module>
with open(p) as f:
TypeError: invalid file: PosixPath('/home/skovorodkin/stack/scripts/2.py')
As you can see op...
Clear terminal in Python [duplicate]
...
Or now, in Python3, print(chr(27) + "[2J")
– david.barkhuizen
Jan 18 '14 at 19:01
4
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Convert base-2 binary number string to int
...t;> int('11111111', 2)
255
Here is documentation for python2, and for python3.
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Element-wise addition of 2 lists?
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N.B. - in python3, map() returns an iterable thingy rather than a list. If you do need an actual list, the first answer is list(map(add, list1, list2))
– FLHerne
Mar 24 '16 at 11:25
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django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb
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This in python3 not works. requires ConfigParser which is not available in python3
– gogagubi
Sep 27 '19 at 14:56
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How do I use floating-point division in bash?
...ctave
perl
echo print 1/3 | perl
python2
echo print 1/3. | python2
python3
echo 'print(1/3)' | python3
R
echo 1/3 | R --no-save
with cleaned up output:
echo 1/3 | R --vanilla --quiet | sed -n '2s/.* //p'
ruby
echo print 1/3.0 | ruby
wcalc
echo 1/3 | wcalc
With cleaned up outpu...