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Cleaner method naming convention

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This commit is contained in:
Raymond Hettinger 2007-12-14 02:49:47 +00:00
parent 90e10e79ea
commit 42da874cdd
3 changed files with 30 additions and 30 deletions
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14
Lib/collections.py
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@ -26,12 +26,12 @@ def namedtuple(typename, field_names, verbose=False):
(11, 22)
>>> p.x + p.y # fields also accessable by name
33
>>> d = p.__asdict__() # convert to a dictionary
>>> d = p._asdict() # convert to a dictionary
>>> d['x']
11
>>> Point(**d) # convert from a dictionary
Point(x=11, y=22)
>>> p.__replace__(x=100) # __replace__() is like str.replace() but targets named fields
>>> p._replace(x=100) # _replace() is like str.replace() but targets named fields
Point(x=100, y=22)
"""
@ -49,8 +49,8 @@ def namedtuple(typename, field_names, verbose=False):
raise ValueError('Type names and field names cannot start with a number: %r' % name)
seen_names = set()
for name in field_names:
if name.startswith('__') and name.endswith('__') and len(name) > 3:
raise ValueError('Field names cannot start and end with double underscores: %r' % name)
if name.startswith('_'):
raise ValueError('Field names cannot start with an underscore: %r' % name)
if name in seen_names:
raise ValueError('Encountered duplicate field name: %r' % name)
seen_names.add(name)
@ -61,15 +61,15 @@ def namedtuple(typename, field_names, verbose=False):
template = '''class %(typename)s(tuple):
'%(typename)s(%(argtxt)s)'
__slots__ = ()
__fields__ = property(lambda self: %(field_names)r)
_fields = property(lambda self: %(field_names)r)
def __new__(cls, %(argtxt)s):
return tuple.__new__(cls, (%(argtxt)s))
def __repr__(self):
return '%(typename)s(%(reprtxt)s)' %% self
def __asdict__(self, dict=dict, zip=zip):
def _asdict(self, dict=dict, zip=zip):
'Return a new dict mapping field names to their values'
return dict(zip(%(field_names)r, self))
def __replace__(self, **kwds):
def _replace(self, **kwds):
'Return a new %(typename)s object replacing specified fields with new values'
return %(typename)s(**dict(zip(%(field_names)r, self), **kwds)) \n''' % locals()
for i, name in enumerate(field_names):