One of the examples in PEP 215 is a bit wrong, I think.
>>> print $'\$a'
5
This should output a backslash before the 5, because the
string '\$a' has a backslash character in it.
Also, for clarity, PEP 215 should explicitly specify
that the substitution only occurs once. For example:
# Existing examples
>>> a, b = 5, 6
>>> print $'a = $a, b = $b'
a = 5, b = 6
[...]
>>> x = "$a"
>>> print $'x = $x'
x = $a
Maybe there should also be examples demonstrating that $-strings
adopt the local namespace.
Also, the PEP says:
] $'a = $a, b = $b'
]
] could be compiled as though it were the expression
]
] ('a = ' + str(a) + ', b = ' + str(b))
Consider:
def f(str):
# The argument 'str' masks the builtin str() function.
a, b = find_stuff(str)
print $'a = $a, b = $b'
return a, b
It should be specified that $-strings do not use the local
"str" and "unicode" names to find str() and unicode(); nor
do they look in the current __builtins__ or the __builtin__
module. They should use the actual python C implementations
of str() and unicode(). This can be implemented by putting
a direct reference to str or unicode in the co_consts tuple
of the code object; I don't know how else the author plans
to deal with this.
## Jason Orendorff http://www.jorendorff.com/
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