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This article introduces the relevant knowledge of "how to install and use the module of Python". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Custom module

Generally speaking, the self-defined module method can be directly used by import if the file you want to use is in the same directory, and if it is a different directory, you need to add the path of the module to the file to use. (in fact, it is the same truth, it is to put the module in a location that can be found, but the same directory is scanned by default.)

Import sys sys.path.append (module_dir) single file module

If you define a file module and use it very often (arithmetic library), you can copy the file directly to the python_dir/Lib folder so that you can import it directly.

Network download

Download from the Internet of third-party libraries, generally unzipped, there will be setup.py files, use python to install manually.

Python setup.py installeasy_install and pip

Easy_install provides a convenient and quick way to install online, with one command. Pip is an improved version of easy_install, providing better tips, deleting package and other functions. In the old version of python, there was only easy_install, not pip.

When using the easy_install and pip commands, you can specify to install a specific version of package, and delete a package windows by upgrading a package pip uninstall package_name # by using = =, > =, = version #

Python-2.7.10.amd64.msi and python-3.4.3.amd64.msi installed on windows have easy_install and pip commands installed by default. (check out the exe executable in the C:\ Python27\ Scripts and C:\ Python34\ Scripts folders. )

For example, use the pip command to install numpy (> = 1.7.1) on python 2 and python 3, respectively, and run with administrator privileges when starting cmd.

C:\ Python34\ Scripts\ pip install numpy > = 1.7.1C:\ Python27\ Scripts\ pip install numpy > = 1.7.1

The end of the installation will indicate that the installation is successful, and enter the console interface of python. If you use import numpy without reporting an error, you can use it.

Vcvarsall.bat error

When carrying out the operation, it will prompt Unable to find vcvarsall.bat, mainly when installing some python modules with c or C++ code, it will call the relevant c or C++ library. If you can't find this library, you will report an error. There are many methods on the Internet, such as installing mingw and changing the code, which are unreliable to me. The safest strategy is to install the corresponding VC version according to the wrong prompt. In this way, you will have no problem carrying out all kinds of other related orders.

Personally, it is recommended that the environment of learning python is better than ubuntu.

Ubuntu

Pip is generally not installed on ubuntu systems, so execute the following command to install the pip commands for python 2 and python 3, respectively.

Sudo apt-get install python-pipsudo apt-get install python3-pip

For example, use the pip command to install numpy for python 2 and python 3 (> = 1.7.1)

Sudo pip install numpy > = 1.7.1 # generally use administrator privileges sudo pip3 install numpy > = 1.7.1

The end of the installation will indicate that the installation is successful, and enter the console interface of python. If you use import numpy without reporting an error, you can use it.

This is the end of the content of "how to install and use the module of Python". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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