def substitute(s, mapping):
"""Substitute values from *mapping* into *s*.
*mapping* can be a :class:`dict` or any type that supports the
``get()`` method of the mapping protocol. Replacement values are
copied into the result without further interpretation. Raises
:exc:`~.SubstitutionSyntaxError` if there are malformed constructs
in *s*.
"""
if "$" in s:
result = ''
rest = s
while rest:
p, name, namecase, rest, vtype = _split(rest)
result += p
if name:
v = None
if vtype == 'define':
v = mapping.get(name)
if vtype == 'env':
v = os.getenv(namecase)
if v is None:
raise ZConfig.SubstitutionReplacementError(s, namecase)
result += v
return result
else:
return s
def substitute(s, mapping):
"""Interpolate variables from `mapping` into `s`."""
if "$" in s:
result = ''
rest = s
while rest:
p, name, namecase, rest = _split(rest)
result += p
if name:
v = mapping.get(name)
if v is None:
raise ZConfig.SubstitutionReplacementError(s, namecase)
result += v
return result
else:
return s
