mypyc/test-data/run-exceptions.test

# Test cases for exceptions (compile and run)

[case testException]
from typing import List
def f(x: List[int]) -> None:
    g(x)

def g(x: List[int]) -> bool:
    x[5] = 2
    return True

def r1() -> None:
    q1()

def q1() -> None:
    raise Exception("test")

def r2() -> None:
    q2()

def q2() -> None:
    raise Exception

class A:
    def __init__(self) -> None:
        raise Exception

def hey() -> None:
    A()

[file driver.py]
from native import f, r1, r2, hey
import traceback
try:
    f([])
except IndexError:
    traceback.print_exc()
try:
    r1()
except Exception:
    traceback.print_exc()
try:
    r2()
except Exception:
    traceback.print_exc()
try:
    hey()
except Exception:
    traceback.print_exc()
[out]
Traceback (most recent call last):
  File "driver.py", line 4, in <module>
    f([])
  File "native.py", line 3, in f
    g(x)
  File "native.py", line 6, in g
    x[5] = 2
IndexError: list assignment index out of range
Traceback (most recent call last):
  File "driver.py", line 8, in <module>
    r1()
  File "native.py", line 10, in r1
    q1()
  File "native.py", line 13, in q1
    raise Exception("test")
Exception: test
Traceback (most recent call last):
  File "driver.py", line 12, in <module>
    r2()
  File "native.py", line 16, in r2
    q2()
  File "native.py", line 19, in q2
    raise Exception
Exception
Traceback (most recent call last):
  File "driver.py", line 16, in <module>
    hey()
  File "native.py", line 26, in hey
    A()
  File "native.py", line 23, in __init__
    raise Exception
Exception

[case testTryExcept]
from typing import Any, Iterator
import wrapsys
def g(b: bool) -> None:
    try:
        if b:
            x = [0]
            x[1]
        else:
            raise Exception('hi')
    except:
        print("caught!")

def r(x: int) -> None:
    if x == 0:
        [0][1]
    elif x == 1:
        raise Exception('hi')
    elif x == 2:
        {1: 1}[0]
    elif x == 3:
        a = object()  # type: Any
        a.lol

def f(b: bool) -> None:
    try:
        r(int(b))
    except AttributeError:
        print('no')
    except:
        print(str(wrapsys.exc_info()[1]))
    print(str(wrapsys.exc_info()[1]))

def h() -> None:
    while True:
        try:
            raise Exception('gonna break')
        except:
            print(str(wrapsys.exc_info()[1]))
            break
    print(str(wrapsys.exc_info()[1]))

def i() -> None:
    try:
        r(0)
    except:
        print(type(wrapsys.exc_info()[1]))
        raise

def j(n: int) -> None:
    try:
        r(n)
    except (IndexError, KeyError):
        print("lookup!")
    except AttributeError as e:
        print("attr! --", e)

def k() -> None:
    try:
        r(1)
    except:
        r(0)

def l() -> None:
    try:
        r(0)
    except IndexError:
        try:
            r(2)
        except KeyError as e:
            print("key! --", e)

def m(x: object) -> int:
    try:
        st = id(x)
    except Exception:
        return -1
    return st + 1

def iter_exception() -> Iterator[str]:
    try:
        r(0)
    except KeyError as e:
        yield 'lol'

[file wrapsys.py]
# This is a gross hack around some limitations of the test system/mypyc.
from typing import Any
import sys
def exc_info() -> Any:
    return sys.exc_info()  # type: ignore

[file driver.py]
import sys, traceback
from native import g, f, h, i, j, k, l, m, iter_exception
from testutil import assertRaises
print("== i ==")
try:
    i()
except:
    traceback.print_exc(file=sys.stdout)

print("== k ==")
try:
    k()
except:
    traceback.print_exc(file=sys.stdout)

print("== g ==")
g(True)
g(False)

print("== f ==")
f(True)
f(False)

print("== h ==")
h()

print("== j ==")
j(0)
j(2)
j(3)
try:
    j(1)
except:
    print("out!")

print("== l ==")
l()

m('lol')

with assertRaises(IndexError):
    list(iter_exception())

[out]
== i ==
<class 'IndexError'>
Traceback (most recent call last):
  File "driver.py", line 6, in <module>
    i()
  File "native.py", line 44, in i
    r(0)
  File "native.py", line 15, in r
    [0][1]
IndexError: list index out of range
== k ==
Traceback (most recent call last):
  File "native.py", line 59, in k
    r(1)
  File "native.py", line 17, in r
    raise Exception('hi')
Exception: hi

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "driver.py", line 12, in <module>
    k()
  File "native.py", line 61, in k
    r(0)
  File "native.py", line 15, in r
    [0][1]
IndexError: list index out of range
== g ==
caught!
caught!
== f ==
hi
None
list index out of range
None
== h ==
gonna break
None
== j ==
lookup!
lookup!
attr! -- 'object' object has no attribute 'lol'
out!
== l ==
key! -- 0

[case testTryFinally]
from typing import Any
import wrapsys

def a(b1: bool, b2: int) -> None:
    try:
        if b1:
            raise Exception('hi')
    finally:
        print('finally:', str(wrapsys.exc_info()[1]))
        if b2 == 2:
            return
        if b2 == 1:
            raise Exception('again!')

def b(b1: int, b2: int) -> str:
    try:
        if b1 == 1:
            raise Exception('hi')
        elif b1 == 2:
            [0][1]
        elif b1 == 3:
            return 'try'
    except IndexError:
        print('except')
    finally:
        print('finally:', str(wrapsys.exc_info()[1]))
        if b2 == 2:
            return 'finally'
        if b2 == 1:
            raise Exception('again!')
    return 'outer'

def c() -> str:
    try:
        try:
            return 'wee'
        finally:
            print("out a")
    finally:
        print("out b")


[file wrapsys.py]
# This is a gross hack around some limitations of the test system/mypyc.
from typing import Any
import sys
def exc_info() -> Any:
    return sys.exc_info()  # type: ignore

[file driver.py]
import traceback
import sys
from native import a, b, c

def run(f):
    try:
        x = f()
        if x:
            print("returned:", x)
    except Exception as e:
        print("caught:", type(e).__name__ + ": " + str(e))

print("== a ==")
for i in range(3):
    for b1 in [False, True]:
        run(lambda: a(b1, i))

print("== b ==")
for i in range(4):
    for j in range(3):
        run(lambda: b(i, j))

print("== b ==")
print(c())

[out]
== a ==
finally: None
finally: hi
caught: Exception: hi
finally: None
caught: Exception: again!
finally: hi
caught: Exception: again!
finally: None
finally: hi
== b ==
finally: None
returned: outer
finally: None
caught: Exception: again!
finally: None
returned: finally
finally: hi
caught: Exception: hi
finally: hi
caught: Exception: again!
finally: hi
returned: finally
except
finally: None
returned: outer
except
finally: None
caught: Exception: again!
except
finally: None
returned: finally
finally: None
returned: try
finally: None
caught: Exception: again!
finally: None
returned: finally
== b ==
out a
out b
wee

[case testCustomException]
from typing import List

class ListOutOfBounds(IndexError):
    pass

class UserListWarning(UserWarning):
    pass

def f(l: List[int], k: int) -> int:
    try:
        return l[k]
    except IndexError:
        raise ListOutOfBounds("Ruh-roh from f!")

def g(l: List[int], k: int) -> int:
    try:
        return f([1,2,3], 3)
    except ListOutOfBounds:
        raise ListOutOfBounds("Ruh-roh from g!")

def k(l: List[int], k: int) -> int:
    try:
        return g([1,2,3], 3)
    except IndexError:
        raise UserListWarning("Ruh-roh from k!")

def h() -> int:
    try:
        return k([1,2,3], 3)
    except UserWarning:
        return -1

[file driver.py]
from native import h
assert h() == -1

[case testExceptionAtModuleTopLevel]
from typing import Any

def f(x: int) -> None: pass

y: Any = ''
f(y)

[file driver.py]
import traceback
try:
    import native
except TypeError:
    traceback.print_exc()
else:
    assert False

[out]
Traceback (most recent call last):
  File "driver.py", line 3, in <module>
    import native
  File "native.py", line 6, in <module>
    f(y)
TypeError: int object expected; got str