[Level 2] Replace doc by variable name in Python. 

#!/bin/env python
doc = '''
a: %(a)s
b: %(b)s
c: %(c)s
d: %(d)s
'''

dict = {
'a': 'a1',
'b': 'b1',
'c': 'c1',
'd': 'd1',
}

print doc % dict

$ /tmp/t.py 

a: a1
b: b1
c: c1
d: d1

$
Wish this helps. regards, Stanley Huang

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