Installation Of Python
Many PCs and Macs will have
python already installed.
To check if you have
python installed on a Windows PC, search in the
start bar for Python or run the following on the Command Line (cmd.exe):
C:UsersYour Name>python –version
To check if you have python installed on a
Linux or Mac, then on linux open the
command line or on
Mac open the Terminal and type:
python –version
If you find that you do not have python installed on your computer, then you can download it for the
Python official website:
https://www.python.org/
Python Quickstart
Python is an
interpreted programming language, this means that as a developer you write Python (.py) files in a
text editor and then put those files into the python interpreter to be
executed.
The way to run a
python file is like this on the command line:
C:UsersYour Name>python helloworld.py
Where “
helloworld.py” is the name of your python file.
Let’s write our first Python file, called
helloworld.py, which can be done in any text editor.
helloworld.py
print(
“Hello, World!”)
Simple as that. Save your file. Open your
command line, navigate to the directory where you saved your file, and
run:
C:UsersYour Name>python helloworld.py
The output should read:
Hello, World!
Congratulations,
you have written and executed your first Python program.
The Python Command Line
To test a short amount of code in python sometimes it is
quickest and easiest not to write the code in a file. This is made possible because Python can be run as a
command line itself.
Type the following on the
Windows, Mac or Linux command line:
C:UsersYour Name>python
Or, if the “
python” command did not work, you can try “
py“:
C:UsersYour Name>py
From there you can write any python, including our
hello world example in the above tutorial:
C:UsersYour Name>python
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)] on win32 Type “help”, “copyright”, “credits” or “license” for more information.
>>>
print(
“Hello, World!”)
Which will write “
Hello, World!” in the
command line:
C:UsersYour Name>python Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)] on win32 Type “help“, “copyright”, “credits” or “license” for more information.
>>>
print(
“Hello, World!”)
Hello, World!
Whenever you are done in the
python command line, you can simply type the following to quit the
python command line interface:
exit()
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