GH/ID/PL - Realpython, learnpython

learnpython.org/Basic Operators.py

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+# Check out the documentation on the Basic-Operators.md file in this folder
+
+# Examples of operators
+number = 1 + 2 # sets the value of number to 3 (1 + 2) - integer variable
+print(number) # prints the value of the variable number, in this case 3
+
+# Modulus operator
+remainder = 11 % 3 # sets the value of the variable "remainder" to the remainder of 11 divided by 3
+print(remainder)
+
+# Types of operators in Python
+# +. Addition
+# -. Subtraction
+# *. Multiplication
+# /. Division
+# %. Modulus - returns the remainder of a division
+# Power operators
+squared = 7 ** 2 # sets the value of "squared" (an integer variable) to the value of 7^2 - 49
+cubed = 7 ** 3 # sets the value of "cubed" (an integer/float variable) to the value of 7^3 = 343
+print(cubed + squared) # prints the value of cubed added to the value of squared
+
+# Operators & Strings
+# addition and strings
+helloworld = "hello " + "world" #sets the value of the string variable "helloworld" to "hello + world" = "hello world"
+print(helloworld) # prints the value of "helloworld", in this case hello world
+# multiplication abd strings
+lotsofstring = "string" * 10 # sets the value of "lotsofstring" to 10xstring
+print(lotsofstring) # prints string x10 
+
+# Operators can be used with lists
+even_numbers = [2,4,6,8]
+odd_numbers = [1,3,5,7]
+all_numbers = odd_numbers + even_numbers
+print(all_numbers)
+
+print([1,2,3] * 3) # prints "1,2,3" 3 times
+
+# Exercise for "Basic Operators" from LearnPython.org
+x = object()
+y = object()
+
+# TODO: change this code
+x_list = [x,x,x,x,x,x,x,x,x,x]
+y_list = [y,y,y,y,y,y,y,y,y,y]
+big_list = ([x,y] * 10)
+
+print("x_list contains %d objects" % len(x_list))
+print("y_list contains %d objects" % len(y_list))
+print("big_list contains %d objects" % len(big_list))
+
+# testing code
+if x_list.count(x) == 10 and y_list.count(y) == 10:
+    print("Almost there...")
+if big_list.count(x) == 10 and big_list.count(y) == 10:
+    print("Great!")

learnpython.org/Basic-Operators.md

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+# LearnPython.org >> Basic Operators
+
+[![forthebadge made-with-python](http://ForTheBadge.com/images/badges/made-with-python.svg)](https://www.python.org/)
+
+* Just as with other programming languages, basic operators (+, -, /, *) can be used in Python
+
+An example of using operators in integer variables;
+
+```python
+number = 1 + 2 # sets the value of the int variable "number" to 3
+print(number) # prints the value of the variable "number", in this case 3
+
+# note: all the code on these documentation files are also put into Python files in the same folder
+```
+
+* There are many different operators:
+
+## Types of Operators
+
+* +. Addition
+* -. Subtraction
+* *. Multiplication
+* /. Division
+* %. Modulus - returns the remainder of a division
+
+Modulus example:
+
+```python
+remainder = 11 % 3 # sets the value of the variable "remainder" to the remainder of 11 divided by 3
+print(remainder)
+```
+
+2 multiplication symbols put together create a power relationship:
+
+```python
+squared = 7 ** 2 # sets the value of "squared" (an integer variable) to the value of 7^2 - 49
+cubed = 7 ** 3 # sets the value of "cubed" (an integer/float variable) to the value of 7^3 = 343
+print(cubed + squared) # prints the value of cubed added to the value of squared
+```
+
+## Operators & strings
+
+* Python supports ***concatenating*** strings using the ***addition*** operator:
+
+```python
+helloworld = "hello " + "world" #sets the value of the string variable "helloworld" to "hello + world" = "hello world"
+
+print(helloworld) # prints the value of "helloworld", in this case hello world
+```
+
+* You can also use the multiplication operator with strings:
+
+```python
+lotsofstring = "string" * 10 # sets the value of "lotsofstring" to 10xstring
+print(lotsofstring) # prints string x10
+```
+
+## Operators & Lists
+
+Operators can be used with lists:
+
+```python
+even_numbers = [2,4,6,8]
+odd_numbers = [1,3,5,7]
+all_numbers = odd_numbers + even_numbers
+print(all_numbers)
+```
+
+```python
+print([1,2,3] * 3) # prints "1,2,3" 3 times
+```
+
+## Exercise
+
+```python
+x = object()
+y = object()
+
+# TODO: change this code
+x_list = [x,x,x,x,x,x,x,x,x,x]
+y_list = [y,y,y,y,y,y,y,y,y,y]
+big_list = ([x,y] * 10)
+
+print("x_list contains %d objects" % len(x_list))
+print("y_list contains %d objects" % len(y_list))
+print("big_list contains %d objects" % len(big_list))
+
+# testing code
+if x_list.count(x) == 10 and y_list.count(y) == 10:
+    print("Almost there...")
+if big_list.count(x) == 10 and big_list.count(y) == 10:
+    print("Great!")
+```
+

learnpython.org/Hello World!.py

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+print("Hello, World!")
+# This prints "Hello World" to the console

learnpython.org/Learn Python Workspace.code-workspace

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+{
+	"folders": [
+		{
+			"path": "C:\\Users\\arbuc\\OneDrive\\Documents\\GitHub\\python-learning"
+		}
+	],
+	"settings": {}
+}

learnpython.org/Lists - LearnPython.org.md

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+# Lists - LearnPython.org
+
+* Lists - similar to ***arrays*** (variables which can hold more than one value)
+* Lists can contain any type of variable
+* They can contain as many variables as you want
+
+A list can be built like this:
+
+```python
+mylist = []
+mylist.append(1)
+mylist.append(2)
+mylist.append(3)
+print(mylist[0]) # prints 1
+print(mylist[1]) # prints 2
+print(mylist[2]) # prints 3
+
+# prints out 1,2,3
+for x in mylist:
+    print(x)
+```
+

learnpython.org/Python - Hello World.md

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+# Python - Hello World
+
+*From LearnPython.org*
+
+https://www.learnpython.org/en/Hello%2C_World%21
+
+* The "print" directive prints out a line
+* It also includes a newline (unlike in the C programming language)
+
+A string can be written in Python like this:
+
+```python
+print("Hello World")
+# This would print out "Hello World" to the console, without the quotation marks
+```
+
+The exercise can also be seen in Github/IrisDroidology/Python-Learning, go to the Master Branch, then LearnPython.org, then HelloWorld!.py

learnpython.org/Python - Variables & Types.md

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+# Variables & Types
+
+*From LearnPython.org*
+
+https://www.learnpython.org/en/Variables_and_Types
+
+* Python is **object oriented**
+  * It is not **statically typed**
+  * This means you do not need to declare variables before using them
+  * You also do not need to declare their type
+
+## Types of Variables - Numbers
+
+### Integer 
+
+* Integer - whole number
+
+An example of setting up an integer and printing it:
+
+```python
+myint = 7 # this sets the value of "myint" to 7
+print(myint) # this prints the value of "myint", in this case 7
+```
+
+### Floating point number
+
+* Floating point number - number with decimal point
+
+**Can be a whole number!**
+
+```python
+myfloat = 7.0
+print(myfloat)
+myfloat = float(7)
+print(myfloat)
+```
+
+
+
+### Strings
+
+* Defined with either double or single quotation marks ('' or "")
+* It is better to use "" as you can then use apostrophes in the string
+
+```python
+# Example of String variable in Python
+mystring = "This is a string"
+print(mystring) # prints the variable of "mystring"
+```
+
+### Operators
+
+* Operators (+, -, *, /) can be used
+
+Example:
+
+```python
+string1 = "This is a string"
+string2 = "that is half-complete"
+print(string1 + string2) #prints the value of "string1" & "string2", in this case "This is a string""that is half-complete". Note that there is no space between string1 and string2
+```
+

learnpython.org/String Formatting.md

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+# String Formatting - LearnPython.org
+
+* Python uses ***c-style*** string formatting
+* This can create new, **formatted** strings
+* The ***%*** operator is used to format a set of variables enclosed in a **tuple** with a **format string**
+* Example: '%s' = 
+
+```python
+# This prints out "Hello, John!"
+name = "John"
+print("Hello, %s!" % name) # %s refers to the name variable
+```
+
+* %s refers to string variable
+* %d refers to number variable
+
+Example:
+
+```python
+name = "Liam"
+age = 16
+print("%s is %d years old" % (name, age))
+```
+

learnpython.org/String Formatting.py

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+# This prints out "Hello, John!"
+name = "John"
+print("Hello, %s!" % name) # %s refers to the name variable (take not of where the exclamation mark is placed)
+
+# %d, %s
+name = "Liam"
+age = 16
+print("%s is %d years old" % (name, age))

learnpython.org/lists.py

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+# LearnPython.org >> Lists
+
+# Example list - from the LearnPython site
+mylist = []
+mylist.append(1)
+mylist.append(2)
+mylist.append(3)
+print(mylist[0]) # prints 1
+print(mylist[1]) # prints 2
+print(mylist[2]) # prints 3
+
+# prints out 1,2,3
+for x in mylist:
+    print(x)
+
+# list error
+print(mylist[10]) # this returns an error, as there are only 3 lists (1,2,3) defined right now. There is no list with the value of 10
+
+# List exercise
+numbers = []
+numbers.append(1)
+numbers.append(2)
+numbers.append(3)
+strings = []
+strings.append("hello")
+strings.append("world")
+names = ["John", "Eric", "Jessica"]
+
+# write your code here
+second_name = []
+
+
+# this code should write out the filled arrays and the second name in the names list (Eric).
+print(numbers)
+print(strings)
+print("The second name on the names list is %s" % second_name)
+
+
+    # Solution to exercise
+numbers = []
+strings = []
+names = ["John", "Eric", "Jessica"]
+
+# write your code here
+numbers.append(1)
+numbers.append(2)
+numbers.append(3)
+
+strings.append("hello")
+strings.append("world")
+
+second_name = names[1]
+
+# this code should write out the filled arrays and the second name in the names list (Eric).
+print(numbers)
+print(strings)
+print("The second name on the names list is %s" % second_name)