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# -*- coding: utf-8 -*-
"""
This module contains snippets of Python 3 code (invalid Python 2) and
tests for whether they can be passed to ``pasteurize`` and
immediately run under both Python 2 and Python 3.
"""
from __future__ import print_function, absolute_import
import pprint
from subprocess import Popen, PIPE
import tempfile
import os
from future.tests.base import CodeHandler, unittest, skip26
class TestPasteurize(CodeHandler):
"""
After running ``pasteurize``, these Python 3 code snippets should run
on both Py3 and Py2.
"""
def setUp(self):
# For tests that need a text file:
_, self.textfilename = tempfile.mkstemp(text=True)
super(TestPasteurize, self).setUp()
def tearDown(self):
os.unlink(self.textfilename)
@skip26 # Python 2.6's lib2to3 causes the "from builtins import
# range" line to be stuck at the bottom of the module!
def test_range_slice(self):
"""
After running ``pasteurize``, this Python 3 code should run
quickly on both Py3 and Py2 without a MemoryError
"""
code = '''
for i in range(10**8)[:10]:
pass
'''
self.unchanged(code, from3=True)
def test_print(self):
"""
This Python 3-only code is a SyntaxError on Py2 without the
print_function import from __future__.
"""
code = '''
import sys
print('Hello', file=sys.stderr)
'''
self.unchanged(code, from3=True)
def test_division(self):
"""
True division should not be screwed up by conversion from 3 to both
"""
code = '''
x = 3 / 2
assert x == 1.5
'''
self.unchanged(code, from3=True)
# TODO: write / fix the raise_ fixer so that it uses the raise_ function
@unittest.expectedFailure
def test_exception_indentation(self):
"""
As of v0.11.2, pasteurize broke the indentation of ``raise`` statements
using with_traceback. Test for this.
"""
before = '''
import sys
if True:
try:
'string' + 1
except TypeError:
ty, va, tb = sys.exc_info()
raise TypeError("can't do that!").with_traceback(tb)
'''
after = '''
import sys
from future.utils import raise_with_traceback
if True:
try:
'string' + 1
except TypeError:
ty, va, tb = sys.exc_info()
raise_with_traceback(TypeError("can't do that!"), tb)
'''
self.convert_check(before, after, from3=True)
# TODO: fix and test this test
@unittest.expectedFailure
def test_urllib_request(self):
"""
Example Python 3 code using the new urllib.request module.
Does the ``pasteurize`` script handle this?
"""
before = """
import pprint
import urllib.request
URL = 'http://pypi.python.org/pypi/{}/json'
package = 'future'
r = urllib.request.urlopen(URL.format(package))
pprint.pprint(r.read())
"""
after = """
import pprint
import future.standard_library.urllib.request as urllib_request
URL = 'http://pypi.python.org/pypi/{}/json'
package = 'future'
r = urllib_request.urlopen(URL.format(package))
pprint.pprint(r.read())
"""
self.convert_check(before, after, from3=True)
def test_urllib_refactor2(self):
before = """
import urllib.request, urllib.parse
f = urllib.request.urlopen(url, timeout=15)
filename = urllib.parse.urlparse(url)[2].split('/')[-1]
"""
after = """
from future.standard_library.urllib import request as urllib_request
from future.standard_library.urllib import parse as urllib_parse
f = urllib_request.urlopen(url, timeout=15)
filename = urllib_parse.urlparse(url)[2].split('/')[-1]
"""
def test_correct_exit_status(self):
"""
Issue #119: futurize and pasteurize were not exiting with the correct
status code. This is because the status code returned from
libfuturize.main.main() etc. was a ``newint``, which sys.exit() always
translates into 1!
"""
from libpasteurize.main import main
# Try pasteurizing this test script:
retcode = main([self.textfilename])
self.assertTrue(isinstance(retcode, int)) # i.e. Py2 builtin int
class TestFuturizeAnnotations(CodeHandler):
@unittest.expectedFailure
def test_return_annotations_alone(self):
before = "def foo() -> 'bar': pass"
after = """
def foo(): pass
foo.__annotations__ = {'return': 'bar'}
"""
self.convert_check(before, after, from3=True)
b = """
def foo() -> "bar":
print "baz"
print "what's next, again?"
"""
a = """
def foo():
print "baz"
print "what's next, again?"
"""
self.convert_check(b, a, from3=True)
@unittest.expectedFailure
def test_single_param_annotations(self):
b = "def foo(bar:'baz'): pass"
a = """
def foo(bar): pass
foo.__annotations__ = {'bar': 'baz'}
"""
self.convert_check(b, a, from3=True)
b = """
def foo(bar:"baz"="spam"):
print("what's next, again?")
print("whatever.")
"""
a = """
def foo(bar="spam"):
print("what's next, again?")
print("whatever.")
foo.__annotations__ = {'bar': 'baz'}
"""
self.convert_check(b, a, from3=True)
def test_multiple_param_annotations(self):
b = "def foo(bar:'spam'=False, baz:'eggs'=True, ham:False='spaghetti'): pass"
a = "def foo(bar=False, baz=True, ham='spaghetti'): pass"
self.convert_check(b, a, from3=True)
b = """
def foo(bar:"spam"=False, baz:"eggs"=True, ham:False="spam"):
print("this is filler, just doing a suite")
print("suites require multiple lines.")
"""
a = """
def foo(bar=False, baz=True, ham="spam"):
print("this is filler, just doing a suite")
print("suites require multiple lines.")
"""
self.convert_check(b, a, from3=True)
def test_mixed_annotations(self):
b = "def foo(bar=False, baz:'eggs'=True, ham:False='spaghetti') -> 'zombies': pass"
a = "def foo(bar=False, baz=True, ham='spaghetti'): pass"
self.convert_check(b, a, from3=True)
b = """
def foo(bar:"spam"=False, baz=True, ham:False="spam") -> 'air':
print("this is filler, just doing a suite")
print("suites require multiple lines.")
"""
a = """
def foo(bar=False, baz=True, ham="spam"):
print("this is filler, just doing a suite")
print("suites require multiple lines.")
"""
self.convert_check(b, a, from3=True)
b = "def foo(bar) -> 'brains': pass"
a = "def foo(bar): pass"
self.convert_check(b, a, from3=True)
def test_functions_unchanged(self):
s = "def foo(): pass"
self.unchanged(s, from3=True)
s = """
def foo():
pass
pass
"""
self.unchanged(s, from3=True)
s = """
def foo(bar='baz'):
pass
pass
"""
self.unchanged(s, from3=True)
if __name__ == '__main__':
unittest.main()
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