Newbie Variable Substitution Question

[Erik Max Francis]

ckrieg at shaw.ca wrote:

> for c in range(1, 3):
>     print "%(c)s %(1)s" % (locals(), dict01)
> 
> Results in an error: TypeError: format requires a mapping
> 
> Why doesn't the second loop work?  It seems to be a cleaner way of
> doing this.  Am I missing something?

Because when used this way, the string formatting operator % requires
one argument on the left, which is a mapping type.  You're passing it
two.

Consider what would happen if both dictionaries had the same key; which
should be used?  Presuming you wanted them to be checked in order, try:

	d = dict01.copy()
	d.update(locals())
	print ... % d

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