--Originally published at Programming Fundaments

The “while” statement that repeatedly executes a certain statement as long as a given statement is true

while expression:
   statement(s)

The while loop, is that the loop might not ever run. When the condition is tested and the result is false, the loop body will be skipped and the first statement after the while loop will be executed.

Andddd you can create and infinite loop by creating a condition that is never “false”. This is often used by client/server programming, because it needs to run always. Example:

var = 1
while var == 1 :  # This constructs an infinite loop
   num = raw_input("Enter a number  :")
   print "You entered: ", num

--Originally published at Programming Fundaments

A nested construct is one where you have a “if, elif, else” statement inside an “if, elif, else”. It just a combination of the last couple of blogs, but a little more complex. Example

#!/usr/bin/python

var = 100
if var < 200:
   print "Expression value is less than 200"
   if var == 150:
      print "Which is 150"
   elif var == 100:
      print "Which is 100"
   elif var == 50:
      print "Which is 50"
elif var < 50:
   print "Expression value is less than 50"
else:
   print "Could not find true expression"

print "Good bye!"

And it should result in something like this:

Expression value is less than 200
Which is 100
Good bye!

Not so complex really….

Examples and more from: https://www.tutorialspoint.com/python/nested_if_statements_in_python.htm

--Originally published at Programming Fundaments

An “else” conditional is dependent of an “if” statment, it usually executes if the “if” statement goes to 0 or is false.

#!/usr/bin/python

var1 = 100
if var1:
   print "1 - Got a true expression value"
   print var1
else:
   print "1 - Got a false expression value"
   print var1

var2 = 0
if var2:
   print "2 - Got a true expression value"
   print var2
else:
   print "2 - Got a false expression value"
   print var2

print "Good bye!"

Resulting in this:

1 - Got a true expression value
100
2 - Got a false expression value
0
Good bye!

The “elif” conditional allows you to check multiple times for a “true” statement inside your block of code and execute one as soon as one turn “true” Example:

var = 100
if var == 200:
   print "1 - Got a true expression value"
   print var
elif var == 150:
   print "2 - Got a true expression value"
   print var
elif var == 100:
   print "3 - Got a true expression value"
   print var
else:
   print "4 - Got a false expression value"
   print var

print "Good bye!"

Examples and more from: https://www.tutorialspoint.com/python/python_if_else.htm

--Originally published at Programming Fundaments

In python 3 you have to use conditionals to tell the program to make a desition. The fisrt conditional we are gonig to useis “if” example:

If it rains tomorrow, I will do the following:
    - tidy up the cellar 
    - paint the walls
    - If there is some time left, I will 
          - do my tax declaration
Otherwise, I will do the following:
    - go swimming
go to the cinema with my wife in the evening

as simple as that, basically you are making the program to make a desicion depeding of the variable and parameters you input:

if (raining_tomorrow) {
    tidy_up_the_cellar(); 
    paint_the_walls();
    if (time_left) 
          do_taxes();
}

Examples and more from: http://www.python-course.eu/python3_conditional_statements.php

--Originally published at Programming Fundaments

To crate a module, you will need a code editor like, for example, Atom.

You just need to create a code or string on the code editor, then you should save the code with .py and then you have a module. Done, easy peasy.

--Originally published at Programming Fundaments

To use a moodule is necesary to have a text editor creating your cade in the text editor, creating a script, and the files create a module, this can be exported to the python program using the command import(). When ypu have your strings saved , it must be saved with .py at the end the you can use the next command

>>> import example_function

As this does not import the text of the function but the function itsel creatin a whole function with only a couple words in the python interpreter

For more information an examples check out: https://docs.python.org/3/tutorial/modules.html

--Originally published at Programming Fundaments

To create a function  after you call it, you must set the parameters list, or the arguments, and after you call the function you must use the command return(). For a better explanation here is an example:

def fahrenheit(T_in_celsius):
    """ returns the temperature in degrees Fahrenheit """
    return (T_in_celsius * 9 / 5) + 32

for t in (22.6, 25.8, 27.3, 29.8):
    print(t, ": ", fahrenheit(t))

In this function you are defining the parameters list as T_in_celsius, and defining  the t as a list of numbers, which are you celsius numbers, ands it will be converted in fahrenheit, and you will use the return comand to make it repeat the steps with all of the umbers of the list, as you can observe in the next part:

22.6 :  72.68
25.8 :  78.44
27.3 :  81.14
29.8 :  85.64

And thats how you create a function, as you can see its knda difficult in the beginning but after a couple trials and errors you can master this in no time

More information and examples at: http://www.python-course.eu/python3_functions.php