<pre> 
#!/usr/bin/env python3
#=====================================================================================
# Python dictionaries and nested dictionaries
#=====================================================================================
print("Content-Type: text/html \n")     #http header with newline char (required for the web)

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

stuff1 = {'first':'Sam', 'last':'Sultan', 'gender':'M'}

stuff2 = {1:'one', 2:'two', 3:'three', 4:'four', 5:'five', 6:'six'}

stuff3 = [{'id':1, 'fname':'Barbara', 'lname':'Burns',   'ssn':'000-01-0001', 'sex':'F'},       #a list of dictionaries 
          {'id':2, 'fname':'Vincent', 'lname':'Cambria', 'ssn':'000-01-0002', 'sex':'M'}, 
          {'id':3, 'fname':'Duncan',  'lname':'Davidson','ssn':'000-01-0003', 'sex':'M'}]

### Manipulate dictionary 1 ################################################
print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=2 bgcolor=tan>Stuff1')
print('&lt;tr>&lt;td>The entire dictionary as coded       &lt;th>',"{'first':'Sam', 'last':'Sultan', 'gender':'M'}")
print('&lt;tr>&lt;td>The entire dictionary as per Python  &lt;td>', stuff1, '&lt;b>&lt;-- Order is not guaranteed')
print('&lt;tr>&lt;td>The number of elements in dictionary &lt;td>', len(stuff1))
print("&lt;tr>&lt;td>The content of element 'gender'      &lt;td>", stuff1['gender'])
stuff1['first']  = 'Samuel'
stuff1['id']     = '12345678'
stuff1['talent'] = 'none'
print('&lt;tr>&lt;td>stuff1 after change and insert       &lt;td>', stuff1)
del stuff1['talent']
print("&lt;tr>&lt;td>stuff1 after delete element 'talent' &lt;td>", stuff1)
print('&lt;/table>')
print('&lt;br>')


### Manipulate dictionary 2 ################################################
print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=2 bgcolor=tan>Stuff2')
print('&lt;tr>&lt;td>The entire dictionary &lt;th>', stuff2, '&lt;b>&lt;-- Order is not guaranteed')
stuff2_keys = stuff2.keys()
print('&lt;tr>&lt;td>The keys only   &lt;td>', stuff2_keys)
stuff2_vals = stuff2.values()
print('&lt;tr>&lt;td>The values only &lt;td>', stuff2_vals)
stuff2_key_asc  = sorted(stuff2.keys())
print('&lt;tr>&lt;td>Sorting stuff2 by keys ascending    &lt;td>', stuff2_key_asc)
stuff2_key_asc  = sorted(stuff2.keys(),reverse=True)
print('&lt;tr>&lt;td>Sorting stuff2 by keys descending   &lt;td>', stuff2_key_asc)
stuff2_val_asc  = sorted(stuff2.values())
print('&lt;tr>&lt;td>Sorting stuff2 by values ascending  &lt;td>', stuff2_val_asc)
stuff2_val_desc = sorted(stuff2.values(),reverse=True)
print('&lt;tr>&lt;td>Sorting stuff2 by values descending &lt;td>', stuff2_val_desc)
print('&lt;/table>')
print('&lt;br>')


### Manipulate a list of dictionaries ################################################
print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=2 bgcolor=tan>Stuff3 (a list containg dictionaries)')
print('&lt;tr>&lt;td>A list containg a dictionay &lt;td>&lt;b>', stuff3)
print('&lt;tr>&lt;td>Row 1 only                    &lt;td>', stuff3[0] )
print('&lt;tr>&lt;td>Row 2, last name              &lt;td>', stuff3[1]['lname'] )
print('&lt;tr>&lt;td>The length of stuff3          &lt;td>', len(stuff3) )
print('&lt;tr>&lt;td>The length of row 1           &lt;td>', len(stuff3[0]) )

new_student = {'id':4,'fname':'Sam','lname':'Sultan','ssn':'000-01-0004','sex':'M'}
stuff3.append(new_student)                                                          #add another dictionary to the list

print('&lt;tr>&lt;td>Adding a new dictionary to the list&lt;td>', new_student) 

stuff3a = sorted(stuff3, key=lambda stuff3: stuff3['fname'])
print('&lt;tr>&lt;td>Sorting on first name ascending  &lt;td>', stuff3a)

stuff3a = sorted(stuff3, key=lambda stuff3: stuff3['fname'], reverse=True)
print('&lt;tr>&lt;td>Sorting on first name descending &lt;td>', stuff3a)
print('&lt;/table>')
print('&lt;br>')

print('&lt;table border=1>')
print('&lt;tr>&lt;th colspan=5 bgcolor=tan>Looping thru list of dictionaries&lt;/th>&lt;/tr>')

row1      = stuff3[0]
row1_keys = row1.keys()
print('&lt;tr bgcolor=gray>')
for key in row1_keys:
    print('&lt;th>', key, end='')
print('&lt;/tr>')

for row in stuff3:
    print('&lt;tr>', end='')
    for key in row:
        print('&lt;td>', row[key], 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>