9 examples of 'python dict comprehension if else' in Python

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332def visitIf(self, n):
333 if not n.else_:
334 return
335 visits = []
336 for test, code in n.tests:
337 visits.append(walk(code, Visitor(self.defines, self.uses)))
338 visits.append(walk(n.else_, Visitor(self.defines, self.uses)))
339 # compute the intersection of defines
340 self.defines = intersect([v.defines for v in visits])
341 # compute the union of uses, perserving first occurances
342 union = {}
343 visits.reverse()
344 for v in visits:
345 union.update(v.uses)
346 union.update(self.uses)
347 self.uses = union
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1042@utils.check_messages("using-constant-test", "missing-parentheses-for-call-in-test")
1043def visit_comprehension(self, node):
1044 if node.ifs:
1045 for if_test in node.ifs:
1046 self._check_using_constant_test(node, if_test)
1276def visit_ComprehensionNode(self, node):
1277 if node.expr_scope:
1278 self.env_stack.append(self.env)
1279 self.env = node.expr_scope
1280 # Skip append node here
1281 self._visit(node.loop)
1282 if node.expr_scope:
1283 self.env = self.env_stack.pop()
1284 return node
79def visit_If(self, n: ca.If) -> str:
80 n2 = n
81 if (
82 n.iffalse
83 and isinstance(n.iffalse, ca.Compound)
84 and n.iffalse.block_items
85 and len(n.iffalse.block_items) == 1
86 and isinstance(n.iffalse.block_items[0], ca.If)
87 ):
88 n2 = ca.If(cond=n.cond, iftrue=n.iftrue, iffalse=n.iffalse.block_items[0])
89 return super().visit_If(n2) # type: ignore
45def create_comprehension(for_node: ast.For) -> ast.comprehension:
46 return ast.comprehension(target=for_node.target, iter=for_node.iter, ifs=[])
51def test_creating_a_dictionary_with_dictionary_comprehension(self):
52 dict_of_weapons = {'first': 'fear', 'second': 'surprise',
53 'third':'ruthless efficiency', 'forth':'fanatical devotion',
54 'fifth': None}
55
56 dict_comprehension = { k.upper(): weapon for k, weapon in dict_of_weapons.iteritems() if weapon}
57
58 self.assertEqual(False, 'first' in dict_comprehension)
59 self.assertEqual(True, 'FIRST' in dict_comprehension)
60 self.assertEqual(5, len(dict_of_weapons))
61 self.assertEqual(4, len(dict_comprehension))
446def visit_comprehension(self, node, parent):
447 """visit a Comprehension node by returning a fresh instance of it"""
448 newnode = nodes.Comprehension(parent)
449 newnode.postinit(
450 self.visit(node.target, newnode),
451 self.visit(node.iter, newnode),
452 [self.visit(child, newnode) for child in node.ifs],
453 getattr(node, "is_async", None),
454 )
455 return newnode
363def test_dict_comprehension(self):
364 tree = ast.parse('a = {int:"a" for int in range(3,9)}')
365 checker = BuiltinsChecker(tree, '/home/script.py')
366 ret = [c for c in checker.run()]
367 self.assertEqual(len(ret), 1)
595def if_else(self, cond, if_body, else_body):
596 return IfNode(self.pos, cond=cond, body=if_body, else_body=else_body)

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