cpython/Lib/string/templatelib.py at 5b969fd64502a6e2ba6513e2b18beaeae58b8aa1 · python/cpython

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"""Support for template string literals (t-strings)."""

t = t"{0}"

Template = type(t)

Interpolation = type(t.interpolations[0])

del t

def convert(obj, /, conversion):

"""Convert *obj* using formatted string literal semantics."""

if conversion is None:

return obj

if conversion == 'r':

return repr(obj)

if conversion == 's':

return str(obj)

if conversion == 'a':

return ascii(obj)

raise ValueError(f'invalid conversion specifier: {conversion}')

def _template_unpickle(*args):

import itertools

if len(args) != 2:

raise ValueError('Template expects tuple of length 2 to unpickle')

strings, interpolations = args

parts = []

for string, interpolation in itertools.zip_longest(strings, interpolations):

if string is not None:

parts.append(string)

if interpolation is not None:

parts.append(interpolation)

return Template(*parts)