my question here:just a trial
#file1.py
print("HANDLING LISTS")
L = [1.2, 5.6, 7.8]
L[1]= 8.9
for x in L:print(x, end=' ')
print() # display a blank line
for x in L:print(x)
x = 'a'
y = 'b'
print('%s....%s' % (x, y))
print("CONSTRUCTION OF A LIST ELEMENT BY ELEMENT")
value=4.5
L=[]
L[:0]=[value]
for x in L:print(x)
value=3.5
L.append(value)
value=7.4
L.append(value)
value=9.4
L.append(value)
L.sort()
for x in L:print(x, end=' ')
print()
print("length of L=", len(L))
print(L)
print("AVERAGE OF THE VALUES OF A LIST")
L=[3.5, 4.5, 7.4, 9.4]
print(L)
print("length of L=", len(L))
sum=0
for x in L:
sum=sum+x
print(sum)
print("the sum of the whole is: ", sum)
average=sum/len(L)
print("The average value of the whole is: ", average)
exit()