print ("peter.vlasschaert@gmail.com "+", "+"26/02/2021"+
"version ("+str(1.0)+")")
print("="*50)
print ('ref : search in google')

print( "                             ")
print( " how to work with list & set ")
print("-"*25)

# sort of list
print( " sorted list ")

s1=[2,7,8,8,3,5]
print(s1)
s1.sort()  # doubles are more , not removed 
print(s1)


# list & set ( doubles are more ,are removed from the list)
print("list & set ")

y =[2,3,3,1,4,2,5]
yn = y     # copy of y
print(y)
y.append(9)
print(y,yn)
y1 = set(y)   # after of 9 the set sorted list
print(y1)
y2 = list(y1) #  convert set -> list : result sorteed list
print(y2)


# range ,for
print(" range & for")
print( "-"*10)
x = range(6,10,1)
for n in x:
 print(n)
# identical of rhs
print(x)



# append two list
print(" append two lists ")
print("-"*15)

a = ["apple", "banana", "cherry"]
print(a)
b = ["Ford", "BMW", "Volvo"]
print(b)
a.append(b)
print("a=",a)
# elements of list
print("a[0]=",a[0])
print("a[1]=",a[1])
print("a[3]=",[3])
print("a[3][0] =",a[3][0])
print("a[:1] = ",a[:1])
print("a[1:] = ",a[1:])


# list & range (index default by zero) ,'see above'
print( " list & range ")
print("---------------")

print( "-> method 1 ")

qs= [*range(10, 16, 1)] #* unpacking operator

print (" output = method 1")
print("[*range(10, 16, 1)] = ",qs)


# extend a list
print ("->  method 2 ")

z=[]     # empty list
start,end = 10,15
if start < end :
         # unpack the result
		 z.extend(range(start,end))
		 # append :last value
		 z.append(end)
		 # end if		 


print("output = method 2")
print(z)
print("="*90)
print( "make exe ,from the file = uselistandset.py -> uselistandset.exe")