<pre> 
#!/usr/bin/env python3
#=====================================================================================
# Python lists and nested lists (A list is an array in most languages)
#=====================================================================================
print("Content-Type: text/html \n")     #http header with newline char (required for the web)

print('''
    &lt;html>
    &lt;body>
    &lt;h1>Python List Functions&lt;/h1>
''')

list1 = [0,1,2,3,4,5,6,7,8,9]

list2 = ['dog', 'cat' ,'pig', 'cow', 'duck', 'bird' ]

list3 = [[1,'Barbara','Burns',   '000-01-0001','F'],            #2-dimensional list 
         [2,'Vincent','Cambria', '000-01-0002','M'], 
         [3,'Duncan', 'Davidson','000-01-0003','M']]
         
list4 = [[ 'x' for col in range(5)] for row in range(5)]        #load all elements with 'x'

list5 = [[ col for col in range(5)] for row in range(5)]        #load all elements with col values


### Manipulate list 1 ################################################
print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=2 bgcolor=tan>list1')
print('&lt;tr>&lt;td>The entire list           &lt;th>', list1)
print('&lt;tr>&lt;td>The length of the list    &lt;td>', len(list1) )
print('&lt;tr>&lt;td>Element 0 and element 1   &lt;td>', list1[0], 'and', list1[1] )
print('&lt;tr>&lt;td>Elements 1 through 5 only &lt;td>', list1[1:6] )
list1[0] = 'zero'
list1.insert(4, 3.01)
list1.append(10)
print('&lt;tr>&lt;td>list1 after change, insert & append  &lt;td>', list1)
del list1[4]
print('&lt;tr>&lt;td>list1 after delete 4th element &lt;td>', list1)
list1.remove(10)
print('&lt;tr>&lt;td>list1 after delete element 10  &lt;td>', list1)
print('&lt;/table>')
print('&lt;br>')


### Manipulate list 2 ################################################
print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=2 bgcolor=tan> list2')
print('&lt;tr>&lt;td>The entire list &lt;th>', list2 )
found = 'cat' in list2
pos   = list2.index('cat')
print("&lt;tr>&lt;td>Does element value='cat' exist?      &lt;td>", found, ", in position:", pos)
string = '_'.join(list2)
print('&lt;tr>&lt;td>Converting the list to a string      &lt;td>', string)
list2a = string.split('_')
print('&lt;tr>&lt;td>Converting the string back to a list &lt;td>', list2a)
list2.sort()
print('&lt;tr>&lt;td>Sorting list2 list ascending         &lt;td>', list2)
list2.sort(reverse=True)
print('&lt;tr>&lt;td>Sorting list2 list descending        &lt;td>', list2)
print('&lt;/table>')
print('&lt;br>')


### Manipulate 2-dimensional list3 ################################################
print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=2 bgcolor=tan>list3 (2 Dimensional)')
print('&lt;tr>&lt;td>The entire 2 dimensional list &lt;th>', list3 )
print('&lt;tr>&lt;td>Row 1 only                    &lt;td>', list3[0] )
print('&lt;tr>&lt;td>Row 2, column 5               &lt;td>', list3[1][4] )
print('&lt;tr>&lt;td>The length of list3 list      &lt;td>', len(list3) )
print('&lt;tr>&lt;td>The length of list3 row 1     &lt;td>', len(list3[0]) )

new_list = [4,'Sam', 'Sultan','000-01-0004','M']
list3.append(new_list)                                                  #add entire row to list3

print('&lt;tr>&lt;td>Adding a new inner list to list3&lt;td>', new_list) 

list3a = sorted(list3, key=lambda list3: list3[1]) 
print('&lt;tr>&lt;td>Sorting list3 on column 2 ascending &lt;td>', list3a) 

list3a = sorted(list3, key=lambda list3: list3[1], reverse=True)
print('&lt;tr>&lt;td>Sorting list3 on column 2 descending &lt;td>', list3a)
print('&lt;/table>')
print('&lt;br>')

print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=5 bgcolor=tan>Looping thru 2dim list&lt;/th>&lt;/tr>')     #loop thru 2-dim list
for row in list3:
    print('&lt;tr>', end='')
    for col in row:
        print('&lt;td>', col, end='')
    print('&lt;/tr>')
print('&lt;/table>')
print('&lt;br>')

print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=5 bgcolor=tan>Looping thru list4 (pre-loaded 2dim list&lt;/th>&lt;/tr>')
for row in list4:
    print('&lt;tr>', end='')
    for col in row:
        print('&lt;td>', col, end='')
    print('&lt;/tr>')
print('&lt;/table>')
print('&lt;br>')

print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=5 bgcolor=tan>Looping thru list5 (pre-loaded 2dim list&lt;/th>&lt;/tr>')
for row in list5:
    print('&lt;tr>', end='')
    for col in row:
        print('&lt;td>', col, end='')
    print('&lt;/tr>')
print('&lt;/table>')
print('&lt;br>')

print(''' 
    &lt;/body> 
    &lt;/html> 
''')
      

#=== link to see the python code =================================================
import os, sys
sys.path.insert(0,'/home/s/sultans/web/python/demo')
import zCode                          #import func to display the Python code
filename = os.path.abspath(__file__)  #get absolute file name 
zCode.display(filename)               #call it
#=================================================================================

</pre>