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StringIO in Python3
I am using Python 3.2.1 and I can't import the StringIO module. I use
io.StringIO and it works, but I can't use it with numpy 's genfromtxt like this:
...
ImportError: No module named six
...failing. Eventually I traced it down to an import error in six. Th package python3-six was installed, but the module was not loading. I reinstalled the module with apt, and problem fixed.
– Tim Richardson
Sep 6 '19 at 8:14
...
Mac OS X Git安装教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Mac OS X Git安装教程下载：http: code.google.com p git-osx-installer 下载最新的PGK文件。图形化OpeninGitGui：http: code.google.com p git-osx-installer...下载：http://code.google.com/p/git-osx-installer/
下载最新的PGK文件。
图形化OpeninGitGui：
http://code.goo...
【解决】phpcms升级https后图片重复上传、远程图片不能下载的问题 - 更多技...
【解决】phpcms升级https后图片重复上传、远程图片不能下载的问题phpcms升级https后，发现本站图片重复上传为新的地址，但是图片是空的，每次提交都在变。还可能远程的图片rul不再下载了，原因是https判断漏了，只需要改动一下...
Linux scp 远程文件上传下载，指定端口 - 操作系统(内核) - 清泛网 - 专注C...
Linux scp 远程文件上传下载，指定端口linux-scp1、默认22端口上传、下载文件：scp test tgz root@xxx xxx xxx xxx: tmpscp root@xxx xxx xxx xxx: tmp test tgz 2、指定端口：scp -P8888 root@xxx xxx xxx xxx: tmp test tgz 1、默认22端口上传、下载文件：
scp test.t...
How to run multiple Python versions on Windows
...
install python
C:\Python27
C:\Python36
environment variable
PYTHON2_HOME: C:\Python27
PYTHON3_HOME: C:\Python36
Path: %PYTHON2_HOME%;%PYTHON2_HOME%\Scripts;%PYTHON3_HOME%;%PYTHON3_HOME%\Scripts;
file rename
C:\Python27\python.exe → C:\Python27\pyt...
List comprehension vs map
...CAN BE LAZY, and in fact is lazy in python. That means you can do this (in python3) and your computer will not run out of memory and lose all your unsaved data:
>>> map(str, range(10**100))
<map object at 0x2201d50>
Try doing that with a list comprehension:
>>> [str(n) fo...
How to import a Python class that is in a directory above?
...ot covered here.
some_directory/
foo.py
setup.py
.
#!/usr/bin/env python3
# setup.py
import setuptools
setuptools.setup(
name="foo",
...
py_modules=['foo'],
)
.
python3 -m pip install --editable ./ # or path/to/some_directory/
"editable" aka -e will yet-again redirect the i...
Why is there no tuple comprehension in Python?
... is tuple([generator]).
Performance Comparison
List comprehension:
$ python3 -m timeit "a = [i for i in range(1000)]"
10000 loops, best of 3: 27.4 usec per loop
Tuple from list comprehension:
$ python3 -m timeit "a = tuple([i for i in range(1000)])"
10000 loops, best of 3: 30.2 usec per loop...
What are good uses for Python3's “Function Annotations”
Function Annotations: PEP-3107
12 Answers
12
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