Setting Up a Python Development Environment on Windows, macOS, and Linux with Basic Python Usage

Setting Up Python Development Environment

Environment Setup on Windows

Download the installer from https://www.python.org/downloads/windows/

Run the installer and follow the prompts.

Environment Setup on macOS

Download the installer from https://www.python.org/downloads/mac-osx/

Run the installer and follow the prompts.

Environment Setup on Linux

Download the source package: https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz

[root@devops ~]# wget https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz
--2019-07-20 08:41:48--  https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz
Resolving www.python.org (www.python.org)... 151.101.108.223, 2a04:4e42:36::223
Connecting to www.python.org (www.python.org)|151.101.108.223|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 23017663 (22M) [application/octet-stream]
Saving to: ‘Python-3.7.4.tgz’

 3% [==>                                                                                     ] 805,859     34.0KB/s  eta 13m 8s

yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel libffi-devel
 
tar zxf Python-3.7.4.tgz -C /usr/local
cd /usr/local/Python-3.7.4
./configure --enable-shared --prefix=/usr/local/python37
make  && make install

ln -s /usr/local/python37/bin/python3.7 /usr/local/bin/python3

cd /usr/local/python37/lib/
ls
libpython3.7m.so  libpython3.7m.so.1.0  libpython3.so  pkgconfig  python3.7
cp libpython3.7m.so.1.0  /usr/lib64/

FAQ

Could not build the ssl module!
Python requires an OpenSSL 1.0.2 or 1.1 compatible libssl with X509_VERIFY_PARAM_set1_host().
LibreSSL 2.6.4 and earlier do not provide the necessary APIs, https://github.com/libressl-portable/portable/issues/381

yum install openssl-devel  -y

[root@devops bin]# python3
python3: error while loading shared libraries: libpython3.7m.so.1.0: cannot open shared object file: No such file or directory

Install Python Editor – VSCode

Hello World Example

Press F5 to run the script.

Python Variable Definition and Usage

Variable Naming

The first character of an identifier must be a letter (uppercase or lowercase) or an underscore "_".

Subsequent characters can be letters, underscores, or digits (0‑9).

Identifiers are case‑sensitive; "Myname" and "myname" are different.

Valid identifiers: _myname, name23, alb2_23.

Invalid identifiers: 2things, this is spaced out, my-name.

Variable names should be meaningful and represent their purpose.

Common naming styles: task_detail, taskDetail, TaskDetail.

Keywords cannot be used as variable names.

Python keywords: ['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'not', 'or', 'pass', 'print', 'raise', 'return', 'try', 'while', 'with', 'yield']

Practical – Print Personal Information

print("Hello World!")
print("I am zhangsan")

name = "zhangsan"
sex = "男"
age = "40"
high = "178"
address = "Beijing"

print("myname is: " + name)
print("sex is : " + sex)
print("age is : " + age)
print("high is : " + high)
print("address is " + address)

----->>>

Hello World!
I am zhangsan
myname is: name
sex is : 男
age is : 40
high is : 178
address is Beijing