Create main.py

Author: EmperorMurfy

pythonLists/main.py

@@ -0,0 +1,60 @@
+# use '#' instead of // like other coding lang for same purpose.
+cars1 = ["Ford", "Volvo", "BMW"] # array - creates a list of cars
+
+# check https://www.w3schools.com/python/python_arrays.asp for array func
+
+# note: python does not have 'arrays' by technicality, can use lists to take func - will refer as 'arrays' in my case
+
+x = cars1[0] # create an x variable and assign the first item in the cars array to it 
+
+print(x) # prints x 
+
+user3 = "human3" # creates a variable and assign it a value
+users = ["human1", "human2", user3] # new array 
+
+for y in users:  
+  print(y)
+
+users.append("human4") # .append is an add method to an array
+print(users[3]) 
+
+print("removed list")
+users.pop(2) # .pop is a remove method to an array, in this case, removes the third item in the array
+
+users.remove("human1") #.remove is also a remove method to an array, in this case, will remove the item with 'human1' - only the first occurance of 'human1' - i.e one will be removed, not all
+
+for y in users:  
+  print(y) # check list again, result human2 + human4
+
+
+# cars func examples
+
+# car2 func
+# A function that returns the 'year' value:
+def funcCar2(e):
+  return e['year']
+
+cars2 = [
+  {'car': 'Ford', 'year': 2005},
+  {'car': 'Mitsubishi', 'year': 2000},
+  {'car': 'BMW', 'year': 2019},
+  {'car': 'VW', 'year': 2011}
+]
+
+cars2.sort(key=funcCar2)
+
+print(cars2)
+
+# car3 func
+# a functon that returns the length of a value
+def funcCar3(e):
+  return len(e)
+
+cars3 = ['Ford', 'Mitsubishi', 'BMW', 'VW']
+
+cars3.sort(reverse=True, key=funcCar3)
+
+print(cars3)
+
+
+