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Python学习

Python 14.46% Jupyter Notebook 57.92% CMake 7.08% C 3.60% C++ 7.38% Makefile 9.55%

python3 python27

python's Introduction

Python

Python学习想在哪个文件夹下打开jupyter，就在相对应的文件夹下打开终端运行 jupyter-notebook

python库（numpy&pandas&...）学习：https://github.com/HuangCongQing/python-libraries
- https://pypi.org
- https://www.lfd.uci.edu/~gohlke/pythonlibs/

点云相关处理

Tutorial

安装requirement.txt中的包 pip3 install -r requirement.txt

解决Python代码编码问题 Non-UTF-8 code starting with '\xc4' in file 导致出错的根源就是编码问题。解决方案是：在程序最上面加上：

# coding=gbk

Python 报错 TypeError: 'str' object is not callable

page = fi.write(str(response1.read()))

原因是我的一个变量名叫str和python api的某个str函数名一样，导致

检查你的代码中变量的名字，看有没有变色的，就是设别为底层函数的即可

pip list

该命令查看的是Python安装的第三方模块。

self

命令行

从shell中退出python命令：是. ... 从shell（终端）中退出python：. 1、输入命令行：$ exit(). 2、快捷键： ctrl+Z.

issues

学习资料及视频

Python数据分析升级版https://www.julyedu.com/my/courses
Python网络爬虫实战https://edu.hellobi.com/course/81/lessons
廖雪峰Python 3https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000
lambda: python lambda表达式

python's People

Contributors

Stargazers

Watchers

Forkers

aiyangtian maggiezhang17 dawushixiange shiu12 sacleup2024

python's Issues

pip 安装指定版本

pip在安装包的时候可以不需要从网上下载，以windows的scipy为例

pip install scipy==0.15.1

以上表示安装0.15.1版本的scipy，这里用”==”接版本,如果权限不够则用管理员打开终端，或者

`pip install --user scipy==0.15.1`

作者：Mr-Cat伍可猫
来源：CSDN
原文：https://blog.csdn.net/Mr_Cat123/article/details/80426695
版权声明：本文为博主原创文章，转载请附上博文链接！

SpecNotFound: Envirnment with requirements.txt file needs n name

执行conda env create --file detection.txt

anaconda安装tensorflow的“no module named tensorflow”

conda install tensorflow-gpu==1.11

https://blog.csdn.net/xiakejiang/article/details/82720815#commentBox

如何简单地理解Python中的if name == 'main'

if __name__ == '__main__'的意思是：当.py文件被直接运行时，if __name__ == '__main__'之下的代码块

将被运行；当.py文件以模块形式被导入时，if __name__ == '__main__'之下的代码块不被运行。

Reference:

出现ReadTimeoutError(self._pool, None, 'Read timed out.')

   raise ReadTimeoutError(self._pool, None, 'Read timed out.')
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.

Anaconda安装包时PackagesNotFoundError: The following packages are not available from current channels:

IndexError: index 7 is out of bounds for axis 1 with size 7

打开Anaconda Prompt 显示显示python已停止工作

如图

IndexError: only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices

\Conda ResolvePackageNotFound错误

SyntaxError: Non-ASCII character '\xe5'

SyntaxError: invalid syntax

忘加逗号了！！！

同时装了Python3和Python2，怎么用pip？

默认会安装到
如果是python2(python2.exe)
python2 -m pip install 库名

如果是python3（python3.exe）
python3 -m pip install 库名

参见知乎：同时装了Python3和Python2,怎么用pip? - 知乎

python中出现IndentationError:unindent does not match any outer indentation level错误

1.对于此错误，最常见的原因是，的确没有缩进。根据错误提示的行数，去代码中看了下，看起来没有什么问题呀，都有缩进，而且语法也没有错误呀。

2.仔细研究了下代码，发现真的看不出什么问题，突然想到了，把当前python脚本的所有字符（包括空格和tab字符）都显示出来看看到底有没有缩进或者是其他特殊的字符。

作者：HelloWorld_EE
来源：CSDN
原文：https://blog.csdn.net/u010412719/article/details/47089473

TypeError: slice indices must be integers or None or have an index method

见链接：https://blog.csdn.net/c20081052/article/details/80576035

PermissionError: [Errno 13] Permission denied: './sort/IG_filter3001.csv'

原因：我的这个原先文件在excel中打开
solution：把文件关闭即可

ValueError: cannot reshape array of size 9444935 into shape (1219,30967,1)

ValueError: Must have equal len keys and value when setting with an iterable

Windows 系统下.sh脚本文件怎么运行？

channel url: https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free error code: 404

清华大学开源镜像站和**科学技术大学开源镜像站均无限期停止anaconda的镜像服务

https://blog.csdn.net/ddonking/article/details/82698151
也不行
https://blog.csdn.net/weixin_43851212/article/details/89790058

ERROR:Could not find a version that satisfied the requirement recognition.txt ERROR:No matching distribution found for recognition.txt

执行完pip install recognition.txt
之后，报如下错误

报错：KeyError: '[] not found in axis'

UnicodeDecodeError: 'gbk' codec can't decode byte 0xa4 in position 115: ille

解决办法1.

FILE_OBJECT= open('order.log','r', encoding='UTF-8')
解决办法2.

FILE_OBJECT= open('order.log','rb')

QObject::moveToThread: Current thread is not the object`s thread. Cannot move to target thread

UnicodeDecodeError: 'gbk' codec can't decode byte 0xa2 in position 4676: illegal multibyte sequence

ImportError: No module named torch.utils.data

应该是要安装pytorch，但python27好像不能安装pytorch啦

async=true) ^ syntaxerror invalid syntax

async和await从 python3.7 开始已经加入保留关键字中. 参考: What’s New In Python 3.7, 所以async和await不能作为函数的参数名.

https://segmentfault.com/q/1010000015188569/a-1020000015213575

Missing parentheses in call to 'print'

运行python时，出现下面错误

ValueError: Error when checking input: expected conv2d_1_input to have 4 dimensions, but got array with shape (1219, 30967)

需求文件requirements.txt的创建及使用

https://ningyu1.github.io/site/post/67-python-requirements/

https://blog.csdn.net/loyachen/article/details/52028825

NoPackagesFoundError: Package missing in current win-64 channels: - cudatoolkit 7.5 2

Anaconda作为一个工具包集成管理工具，下载python工具包是很方便的，直接敲：

conda install package_name

https://blog.csdn.net/ksws0292756/article/details/79192268

CondaMemoryError: The conda process ran out of memory. Increase system memory and/or try again.

anhaugn安装pytorch时候，报错，个人觉得是内存不够的原因！！！

ImportError: DLL load failed: 找不到指定的模块。

..ImportError: DLL load failed: 找不到指定的模块之...-CSDN博客
 ImportError: DLL load failed:找不到指定的模块 解决..._CSDN博客
 ...ImportError: DLL load failed: 找不到指定的模块...-CSDN博客
 Python34 ImportError:Dll load failed:找不到指定模块? - 知乎

conda激活python环境时报错conda 输入行太长，此时不应有C:\Users\hasee\AppData\Local\Temp\

Fatal error in launcher: Unable to create process using

这个问题是python多版本共存引起的

python 各种包下载大全网址

经常碰见pip install出现异常，安装不了一些python包。
收藏分享一个python库下载网站，可以先在上面直接下载到本地，然后进入对应的文件夹
python setup.py install
就能完美安装了。

https://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml

anaconda出现CondaHTTPError问题

Fatal error in launcher: Unable to create process using '"D:\pytghon2.7\python.exe"

无法创建使用pip.exe创建进程，说白了就是无法启动pip安装插件。

解决方法升级pip:

python -m pip install -U pip

ZeroDivisionError: float division by zero

Anaconda 提示source不是内部命令

Anaconda Navigator打不开:Navigator Error

Traceback (most recent call last):
File "D:\ProgramData\Anaconda3\lib\site-packages\anaconda_navigator\exceptions.py", line 75, in exception_handler
return_value = func(*args, **kwargs)
File "D:\ProgramData\Anaconda3\lib\site-packages\anaconda_navigator\app\start.py", line 115, in start_app
window = run_app(splash)
File "D:\ProgramData\Anaconda3\lib\site-packages\anaconda_navigator\app\start.py", line 58, in run_app
window = MainWindow(splash=splash)
File "D:\ProgramData\Anaconda3\lib\site-packages\anaconda_navigator\widgets\main_window.py", line 160, in __init__
self.api = AnacondaAPI()
File "D:\ProgramData\Anaconda3\lib\site-packages\anaconda_navigator\api\anaconda_api.py", line 1205, in AnacondaAPI
ANACONDA_API = _AnacondaAPI()
File "D:\ProgramData\Anaconda3\lib\site-packages\anaconda_navigator\api\anaconda_api.py", line 65, in __init__
self._conda_api = CondaAPI()
File "D:\ProgramData\Anaconda3\lib\site-packages\anaconda_navigator\api\conda_api.py", line 1622, in CondaAPI
CONDA_API = _CondaAPI()
File "D:\ProgramData\Anaconda3\lib\site-packages\anaconda_navigator\api\conda_api.py", line 340, in __init__
self.set_conda_prefix()
File "D:\ProgramData\Anaconda3\lib\site-packages\anaconda_navigator\api\conda_api.py", line 489, in set_conda_prefix
self.ROOT_PREFIX = info['root_prefix']
TypeError: byte indices must be integers or slices, not str

安装Python模块时，报错[error] Microsoft Visual C++ 14.0 is required

error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": http://landinghub.visualstudio.com/visual-cpp-build-tools

windows安装cygwin运行shell脚本 $'\r': 未找到命令

Python 的list.append()返回值是None

语法
append()方法语法：

list.append(obj)

该方法无返回值，但是会修改原来的列表。

list.append(obj)  正确
list = list.append(obj)  错误