mac system installation Python3 initial experience

2020-06-19 10:59:28
OfStack

At the forefront of

For iOS development, do not disassemble the Python that comes with the system, because many library still use Python2.7.

1 installation Xcode

Search for and install Xcode

1.2 Install Xcode command line tool

1.2.1 Open the command line terminal tool


control + space
 The input terminal
 enter

1.2.2 Install Xcode command line tool


  xcode-select --install

Install the suite management tool Homebrew

2.1 installation Homebrew


/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

2.2 Check whether the installation is successful


brew doctor

The installation Python


brew install python

4. Set path (optional)

If you do not set the path, python will default to the system. (This is not implemented specifically, so this needs to be tried by yourself.)


##  Modify the /etc/paths , /usr/local/bin  Let's move it up here 
sudo vim /etc/paths

Development:
See what path is currently.
Purpose of PATH:
Tell the department where our brew is. It looks up from the top down.


echo $PAHTH

5 Confirm installation


//  System by itself python2.7 Directory for /usr/bin/python
which python
//brew The installation of the python3.4, Directory for /usr/local/bin/python3
which python3

6 use

Action 4 not performed (recommended)


//  System by itself 
python a.py
//brew The installation of the 
python3 a.py

Perform operation 4


//  System by itself 
/usr/bin/python a.py
//brew The installation of the 
python a.py

7 installation pip

Python 2.7 or above will be installed automatically with pip. The system comes with python without pip, only easy_install


  xcode-select --install

Using pip


  xcode-select --install

conclusion