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"""Fixer for except statements with named exceptions.
The following cases will be converted:
- "except E, T:" where T is a name:
except E as T:
- "except E, T:" where T is not a name, tuple or list:
except E as t:
T = t
This is done because the target of an "except" clause must be a
name.
- "except E, T:" where T is a tuple or list literal:
except E as t:
T = t.args
"""
# Author: Collin Winter
# Local imports
from .. import pytree
from ..pgen2 import token
from .. import fixer_base
from ..fixer_util import Assign, Attr, Name, is_tuple, is_list, syms
def find_excepts(nodes):
for i, n in enumerate(nodes):
if n.type == syms.except_clause:
if n.children[0].value == 'except':
yield (n, nodes[i+2])
class FixExcept(fixer_base.BaseFix):
BM_compatible = True
PATTERN = """
try_stmt< 'try' ':' (simple_stmt | suite)
cleanup=(except_clause ':' (simple_stmt | suite))+
tail=(['except' ':' (simple_stmt | suite)]
['else' ':' (simple_stmt | suite)]
['finally' ':' (simple_stmt | suite)]) >
"""
def transform(self, node, results):
syms = self.syms
tail = [n.clone() for n in results["tail"]]
try_cleanup = [ch.clone() for ch in results["cleanup"]]
for except_clause, e_suite in find_excepts(try_cleanup):
if len(except_clause.children) == 4:
(E, comma, N) = except_clause.children[1:4]
comma.replace(Name("as", prefix=" "))
if N.type != token.NAME:
# Generate a new N for the except clause
new_N = Name(self.new_name(), prefix=" ")
target = N.clone()
target.prefix = ""
N.replace(new_N)
new_N = new_N.clone()
# Insert "old_N = new_N" as the first statement in
# the except body. This loop skips leading whitespace
# and indents
#TODO(cwinter) suite-cleanup
suite_stmts = e_suite.children
for i, stmt in enumerate(suite_stmts):
if isinstance(stmt, pytree.Node):
break
# The assignment is different if old_N is a tuple or list
# In that case, the assignment is old_N = new_N.args
if is_tuple(N) or is_list(N):
assign = Assign(target, Attr(new_N, Name('args')))
else:
assign = Assign(target, new_N)
#TODO(cwinter) stopgap until children becomes a smart list
for child in reversed(suite_stmts[:i]):
e_suite.insert_child(0, child)
e_suite.insert_child(i, assign)
elif N.prefix == "":
# No space after a comma is legal; no space after "as",
# not so much.
N.prefix = " "
#TODO(cwinter) fix this when children becomes a smart list
children = [c.clone() for c in node.children[:3]] + try_cleanup + tail
return pytree.Node(node.type, children)
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| __pycache__ | Folder | 0755 |
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| __init__.py | File | 47 B | 0644 |
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| fix_apply.py | File | 2.29 KB | 0644 |
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| fix_asserts.py | File | 984 B | 0644 |
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| fix_basestring.py | File | 320 B | 0644 |
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| fix_buffer.py | File | 590 B | 0644 |
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| fix_dict.py | File | 3.67 KB | 0644 |
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| fix_except.py | File | 3.27 KB | 0644 |
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| fix_exec.py | File | 979 B | 0644 |
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| fix_execfile.py | File | 2 KB | 0644 |
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| fix_exitfunc.py | File | 2.44 KB | 0644 |
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| fix_filter.py | File | 2.7 KB | 0644 |
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| fix_funcattrs.py | File | 644 B | 0644 |
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| fix_future.py | File | 547 B | 0644 |
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| fix_getcwdu.py | File | 451 B | 0644 |
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| fix_has_key.py | File | 3.12 KB | 0644 |
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| fix_idioms.py | File | 4.76 KB | 0644 |
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| fix_import.py | File | 3.18 KB | 0644 |
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| fix_imports.py | File | 5.55 KB | 0644 |
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| fix_imports2.py | File | 289 B | 0644 |
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| fix_input.py | File | 708 B | 0644 |
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| fix_intern.py | File | 1.12 KB | 0644 |
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| fix_isinstance.py | File | 1.57 KB | 0644 |
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| fix_itertools.py | File | 1.51 KB | 0644 |
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| fix_itertools_imports.py | File | 2.04 KB | 0644 |
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| fix_long.py | File | 476 B | 0644 |
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| fix_map.py | File | 3.55 KB | 0644 |
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| fix_metaclass.py | File | 8 KB | 0644 |
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| fix_methodattrs.py | File | 606 B | 0644 |
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| fix_ne.py | File | 571 B | 0644 |
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| fix_next.py | File | 3.1 KB | 0644 |
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| fix_nonzero.py | File | 591 B | 0644 |
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| fix_numliterals.py | File | 768 B | 0644 |
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| fix_operator.py | File | 3.35 KB | 0644 |
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| fix_paren.py | File | 1.2 KB | 0644 |
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| fix_print.py | File | 2.78 KB | 0644 |
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| fix_raise.py | File | 2.86 KB | 0644 |
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| fix_raw_input.py | File | 454 B | 0644 |
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| fix_reduce.py | File | 837 B | 0644 |
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| fix_reload.py | File | 1.06 KB | 0644 |
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| fix_renames.py | File | 2.17 KB | 0644 |
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| fix_repr.py | File | 613 B | 0644 |
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| fix_set_literal.py | File | 1.66 KB | 0644 |
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| fix_standarderror.py | File | 449 B | 0644 |
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| fix_sys_exc.py | File | 1.01 KB | 0644 |
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| fix_throw.py | File | 1.54 KB | 0644 |
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| fix_tuple_params.py | File | 5.43 KB | 0644 |
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| fix_types.py | File | 1.73 KB | 0644 |
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| fix_unicode.py | File | 1.23 KB | 0644 |
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| fix_urllib.py | File | 8.17 KB | 0644 |
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| fix_ws_comma.py | File | 1.06 KB | 0644 |
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| fix_xrange.py | File | 2.63 KB | 0644 |
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| fix_xreadlines.py | File | 689 B | 0644 |
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| fix_zip.py | File | 1.26 KB | 0644 |
|