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relational
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Use fstrings

master
Salvo 'LtWorf' Tomaselli 2020-08-15 21:17:37 +07:00
parent ef28b7272e
commit ccfdff6fd3
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1 changed files with 5 additions and 6 deletions
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11
relational/relation.py
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@ -134,7 +134,7 @@ class Relation(NamedTuple):
try: try:
c_expr = compile(expr, 'selection', 'eval') c_expr = compile(expr, 'selection', 'eval')
except: except:
raise Exception('Failed to compile expression: %s' % expr) raise Exception(f'Failed to compile expression: {expr}')
content = [] content = []
for i in self.content: for i in self.content:
@ -147,8 +147,7 @@ class Relation(NamedTuple):
if eval(c_expr, attributes): if eval(c_expr, attributes):
content.append(i) content.append(i)
except Exception as e: except Exception as e:
raise Exception( raise Exception(f'Failed to evaluate {expr}\n{e}')
"Failed to evaluate %s\n%s" % (expr, e.__str__()))
return Relation(header, frozenset(content)) return Relation(header, frozenset(content))
def product(self, other: 'Relation') -> 'Relation': def product(self, other: 'Relation') -> 'Relation':
@ -403,7 +402,7 @@ class Header(tuple):
for i in self: for i in self:
if not is_valid_relation_name(i): if not is_valid_relation_name(i):
raise Exception('"%s" is not a valid attribute name' % i) raise Exception(f'"{i}" is not a valid attribute name')
if len(self) != len(set(self)): if len(self) != len(set(self)):
raise Exception('Attribute names must be unique') raise Exception('Attribute names must be unique')
@ -419,12 +418,12 @@ class Header(tuple):
attrs = list(self) attrs = list(self)
for old, new in params.items(): for old, new in params.items():
if not is_valid_relation_name(new): if not is_valid_relation_name(new):
raise Exception('%s is not a valid attribute name' % new) raise Exception(f'{new} is not a valid attribute name')
try: try:
id_ = attrs.index(old) id_ = attrs.index(old)
attrs[id_] = new attrs[id_] = new
except: except:
raise Exception('Field not found: %s' % old) raise Exception(f'Field not found: {old}')
return Header(attrs) return Header(attrs)
def sharedAttributes(self, other: 'Header') -> int: def sharedAttributes(self, other: 'Header') -> int: