Simple line input with reentering possibility, unlimited lines

""" Allow reinput of lines of data
    Single 'e' or 'q' as line is not allowed, except 'q' in edit mode is OK

    For daniweb.com by Tony Veijalainen, user pyTony
"""

# Make to work in Python 2 and Python 3
from __future__ import print_function
try:
    input = raw_input
except:
    pass

data = []
line = ''
while True:
    line = input('Enter a datum {}: '.format(len(data)+1))
    if line == 'q':
        break
    elif line == 'e':
        print('Edit mode, "e" exits edit mode, empty line leaves unchanged.')
        for lineno, line in enumerate(data, 1):
            print(lineno, ':', line)
            line = input('e> ')
            if line == 'e':
                break
            else:
                if not line:
                    print('Not changing')
                else:
                    data[lineno-1] = line
        print('Exiting edit mode, now lines are:')
        print(*data, sep='\n')
    else:
        data.append(line)
    
    
print('You input {} data lines:'.format(len(data)))
print(*data, sep='\n')

""" Example session:
Enter a datum 1: 42
Enter a datum 2: 43
Enter a datum 3: d
Enter a datum 4: e
Edit mode, "e" exits edit mode, empty line leaves unchanged.
1 : 42
e> 
Not changing
2 : 43
e> 
Not changing
3 : d
e> 76
Exiting edit mode, now lines are:
42
43
76
Enter a datum 4: 65
Enter a datum 5: y
Enter a datum 6: 43
Enter a datum 7: 23
Enter a datum 8: e
Edit mode, "e" exits edit mode, empty line leaves unchanged.
1 : 42
e> 
Not changing
2 : 43
e> 
Not changing
3 : 76
e> 
Not changing
4 : 65
e> 
Not changing
5 : y
e> 98
6 : 43
e> e
Exiting edit mode, now lines are:
42
43
76
65
98
43
23
Enter a datum 8: 221
Enter a datum 9: q
You input 8 data lines:
42
43
76
65
98
43
23
221
"""