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Hannu-Daniel Goiss
Hannu-Daniel Goiss

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My first Python script running on Windows

I don't have anything Python-related yet on my computer, so I'll start with the complete basics.

Let's go to python.org to download the windows installer of the latest release (https://www.python.org/downloads/release/python-3102/)

I'm installing the standard installation and adding Python to the PATH.
Python Windows Installer
I'm now trying to access python from PowerShell to verify it's accessible from anywhere.

PS C:\Users\hgois> py
Python 3.10.2 (tags/v3.10.2:a58ebcc, Jan 17 2022, 14:12:15) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> quit()
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My next step is to access the tutorial and skim through some parts to get a glimpse - The Python Tutorial β€” Python 3.10.2 documentation
What I can see (with Java/C experience) is:
there are no brackets {} - the body of control flow objects (like while, if for,...) is indented.
There is no β€œ:” at the end of each line.
Stuff looks familiar, so it should be quite easy.

I can also see that I can just declare variables and write functions using the β€œpython command”. So I'm trying to declare two Strings and to use the print function.

PS C:\python> python
Python 3.10.2 (tags/v3.10.2:a58ebcc, Jan 17 2022, 14:12:15) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> name = 'Hannu-Daniel'
>>> city = 'Abu Dhabi'
>>> print (name + ' lives in ' + city)
Hannu-Daniel lives in Abu Dhabi
>>> print ('%s lives in %s' %(name, city) )
Hannu-Daniel lives in Abu Dhabi
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In the above example, we can see two ways of combining the strings name and city with 'lives in'.
1) concatenating with + (this should be familiar for any programmer)
2) using the % operator and String formatting. (this is familiar for C programmers)

Let's try to create a first Python script, where we prompt the user for input and react to it.
The script will simply repeat the response and ask for another input until β€œquit” is entered.

First I'll look at control flow structures (More Control Flow Tools β€” Python 3.10.2 documentation). At least at first glance I cannot see a β€œdo...while” contract similar as in C. Hence I will break the loop with an if.

I will save the following script as firstsample.py

print("Hello! We are just here go greet each other!")

while (True) :  # boolean True with capital letter
   yourmessage = input('What is your name? (or type "quit" to exit): ')
   if(yourmessage == 'quit') : # break the while-loop, if the user typed "quit"
      break
   print('Hello %s! Nice to meet you!' %yourmessage)
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I will now start this using python and process the user input:

PS C:\python> python firstsample.py
Hello! We are just here go greet each other!
What is your name? (or type "quit" to exit): Hannu-Daniel
Hello Hannu-Daniel! Nice to meet you!
What is your name? (or type "quit" to exit): Goiss
Hello Goiss! Nice to meet you!
What is your name? (or type "quit" to exit): quit
PS C:\python>
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Success! First Python script is DONE!

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