open a terminal and type $ python

the interpreter starts with >>>


at the prompt type

>>> print("Hello World!")
Hello World!




using python interpreter like a calculator

at the prompt type

>>> 7 + 3 * 4
19

or

>>> (7 + 3) * 4
40

at the prompt type

>>> 9/3
3.0

or

>>> 5.3/6.2
0.85483870967741926




not only with figures available, but also with text

at the prompt type

 >>> "hello" * 3
 'hellohellohello'





a variable can be assigned values

at the prompt type

>>> a=3
>>> b=4
>>> a*b
12


strings

at the prompt type

>>> "he said \"Mint\"."
'he said "Mint".'

strings put together with operator +

at the prompt type

 >>> 'Ulysses ' + 'Manson'
'Ulysses Manson'


strings repeating with operator *

at the prompt type

>>> 'This text is repeated. '*3
'This text is repeated. This text is repeated. This text is repeated. '




first program

create a new text file  
in the first line must be a shebang (mostly #!/usr/bin/env python or #!/usr/bin/python)
then paste the following lines in the new text file:

print("hello!")
print("how are you?")
print("I'm fine, and yourself;-)")
print("")
print("I got to go, see you soon")
input("Press any key to terminate the program")


clicking twice starts the program

when everything is finished, the program is terminated

have phun ;-)