Python Array of Array - Inner Array processing

#Program -1, To print array of array 
 
a = [[{'Key': 'key700', 'Value': 'val145'}, {'Key': 'key123', 'Value': 'val123'}]]

for i in range(len(a)):
    for j in range(len(a[i])):
        jsonData = a[i][j]
        #print(jsonData);
        for (k, v) in jsonData.items():
            print("Key: " + k)
            print("Value: " + str(v))
   


'''
output
********
Key: Key
Value: key700
Key: Value
Value: val145
Key: Key
Value: Key123
Key: Value
Value: val123

'''


#Program -2 , print only the key=userName

import json

a = [[{'Key': 'age', 'Value': '10'}, {'Key': 'userName', 'Value': 'vijay'}, {'Key': 'address', 'Value': '1, car st'}, {'Key': 'userName', 'Value': 'pranika'}]]

for i in range(len(a)):
    for j in range(len(a[i])):
        jsonData = a[i][j]
        data = json.loads(json.dumps(jsonData ) );
        if ( jsonData['Key'] == 'Name' ):
            print ( jsonData['Value'] )
           
       
   


'''
output
********
vijay
pranika
'''