format Vector: use ... to indicate long Vector(use '*' to showall) by miziaiba · Pull Request #18 · fluentpython/example-code

Expand Up @@ -268,7 +268,13 @@ def angle(self, n): # <2> def angles(self): # <3> return (self.angle(n) for n in range(1, len(self)))
max_format_size = 30 def __format__(self, fmt_spec=''): showall = False if fmt_spec.endswith('*'): fmt_spec = fmt_spec[:-1] showall = True
if fmt_spec.endswith('h'): # hyperspherical coordinates fmt_spec = fmt_spec[:-1] coords = itertools.chain([abs(self)], Expand All @@ -277,7 +283,14 @@ def __format__(self, fmt_spec=''): else: coords = self outer_fmt = '({})' # <6> components = (format(c, fmt_spec) for c in coords) # <7>
# if truncate is needed if (not showall) and len(self) > self.max_format_size: components = itertools.chain((format(x, fmt_spec) for index, x in enumerate(coords) if index < self.max_format_size), ['...']) else: components = (format(x, fmt_spec) for x in coords) # <7>
return outer_fmt.format(', '.join(components)) # <8>
@classmethod Expand Down