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  1. PO
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    <p>What could be more pythonic than PyPy? </p> <p>Look at what I discovered starting at line 284 in ctypes_configure/configure.py:</p> <pre><code> for i in range(0, info['size'] - csize + 1, info['align']): if layout[i:i+csize] == [None] * csize: layout_addfield(layout, i, ctype, '_alignment') break else: raise AssertionError("unenforceable alignment %d" % ( info['align'],)) </code></pre> <p>And here, from line 425 in pypy/annotation/annrpython.py (<a href="http://codespeak.net/pypy/dist/pypy/annotation/annrpython.py" rel="noreferrer">clicky</a>)</p> <pre><code>if cell.is_constant(): return Constant(cell.const) else: for v in known_variables: if self.bindings[v] is cell: return v else: raise CannotSimplify </code></pre> <p>In pypy/annotation/binaryop.py, starting at line 751:</p> <pre><code>def is_((pbc1, pbc2)): thistype = pairtype(SomePBC, SomePBC) s = super(thistype, pair(pbc1, pbc2)).is_() if not s.is_constant(): if not pbc1.can_be_None or not pbc2.can_be_None: for desc in pbc1.descriptions: if desc in pbc2.descriptions: break else: s.const = False # no common desc in the two sets return s </code></pre> <p>A non-one-liner in pypy/annotation/classdef.py, starting at line 176:</p> <pre><code>def add_source_for_attribute(self, attr, source): """Adds information about a constant source for an attribute. """ for cdef in self.getmro(): if attr in cdef.attrs: # the Attribute() exists already for this class (or a parent) attrdef = cdef.attrs[attr] s_prev_value = attrdef.s_value attrdef.add_constant_source(self, source) # we should reflow from all the reader's position, # but as an optimization we try to see if the attribute # has really been generalized if attrdef.s_value != s_prev_value: attrdef.mutated(cdef) # reflow from all read positions return else: # remember the source in self.attr_sources sources = self.attr_sources.setdefault(attr, []) sources.append(source) # register the source in any Attribute found in subclasses, # to restore invariant (III) # NB. add_constant_source() may discover new subdefs but the # right thing will happen to them because self.attr_sources # was already updated if not source.instance_level: for subdef in self.getallsubdefs(): if attr in subdef.attrs: attrdef = subdef.attrs[attr] s_prev_value = attrdef.s_value attrdef.add_constant_source(self, source) if attrdef.s_value != s_prev_value: attrdef.mutated(subdef) # reflow from all read positions </code></pre> <p>Later in the same file, starting at line 307, an example with an illuminating comment:</p> <pre><code>def generalize_attr(self, attr, s_value=None): # if the attribute exists in a superclass, generalize there, # as imposed by invariant (I) for clsdef in self.getmro(): if attr in clsdef.attrs: clsdef._generalize_attr(attr, s_value) break else: self._generalize_attr(attr, s_value) </code></pre>
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    1. POPythonic ways to use 'else' in a for loop
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    1. USThomas L Holaday
    1. USThomas L Holaday
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    1. COThe else: clause in classdef.py:176 is unnecessary since they exit the loop via 'return'.. Incidentally, how did you locate these? Just eyeballing the source, or something smarter?
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      1. USJohn Fouhy
    2. CO+1: Nice research!
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      1. USFerdinand Beyer
    3. COgrep for (for|else) at the same level of indentation within ten lines of each other. If I had the skills of a sea cucumber, I'd figure out where in the PyPy compiler the for ... else flow control happens, add logging, and then build -all.
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      1. USThomas L Holaday
 

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