Pretty Print Formatting Issue in Python

Question

 str = ""
 for i in range(1,91):
 str = str + '-'
 print "+", '{:^90}'.format(str), "+"
 for elem in cursor:
 print "|", '{:^8}'.format(elem['classid']), \
 "|", '{:^8}'.format(elem['dept']), \
 "|", '{:^8}'.format(elem['coursenum']), \
 "|", '{:^8}'.format(elem['area']), \
 "|", '{:<46}'.format(elem['title']), \
 "|"
 print "+", '{:^90}'.format(str), "+"

I have the following code in place to try and print out the results of a db query. In a standalone file, it prints the following output:

+ ------------------------------------------------------------------------------------------ +
| centered | centered | centered | centered | 12 |
| centered | centered | centered | centered | 12 |
| centered | centered | centered | centered | 12 |
+ ------------------------------------------------------------------------------------------ +

When placed in a larger file within a function, it does not work however. We get the following error:

 File "reg.py", line 58, in printHumanOutput
 print "+", '{:^90}'.format(''), "+"
ValueError: zero length field name in format

Help?

Answer 1

Python 2.6 does not support zero-length field names in format strings.

print "+", '{0:^90}'.format(''), "+"