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import friendly_traceback
expected_in_result = friendly_traceback.utils.expected_in_result
def test_Popitem_empty_dict():
d = {}
try:
d.popitem()
except KeyError as e:
message = str(e)
friendly_traceback.explain_traceback(redirect="capture")
result = friendly_traceback.get_output()
assert "popitem(): dictionary is empty" in result
if friendly_traceback.get_lang() == "en":
expected = "You tried to retrieve an item from `d` which is an empty `dict`."
ok, diff = expected_in_result(expected, result)
assert ok, diff
if friendly_traceback._writing_docs:
return result, message
def test_Popitem_empty_ChainMap():
from collections import ChainMap
alpha = ChainMap({}, {})
try:
alpha.popitem()
except KeyError as e:
message = str(e)
friendly_traceback.explain_traceback(redirect="capture")
result = friendly_traceback.get_output()
assert "popitem(): dictionary is empty" in result
if friendly_traceback.get_lang() == "en":
expected = "You tried to retrieve an item from `alpha` which is an empty `ChainMap`."
ok, diff = expected_in_result(expected, result)
assert ok, diff
if friendly_traceback._writing_docs:
return result, message
def test_Generic_key_error():
d = {"a": 1, "b": 2}
try:
d["c"]
except KeyError as e:
message = str(e)
friendly_traceback.explain_traceback(redirect="capture")
result = friendly_traceback.get_output()
assert "KeyError: 'c'" in result
if friendly_traceback.get_lang() == "en":
expected = "The key `'c'` cannot be found in the dict `d`.\n"
ok, diff = expected_in_result(expected, result)
assert ok, diff
if friendly_traceback._writing_docs:
return result, message
def test_ChainMap():
from collections import ChainMap
d = ChainMap({}, {})
try:
d.pop(42)
except KeyError as e:
message = str(e)
friendly_traceback.explain_traceback(redirect="capture")
result = friendly_traceback.get_output()
assert "KeyError: 42" in result
if friendly_traceback.get_lang() == "en":
expected = "The key `42` cannot be found in `d`, an object of type `ChainMap`."
ok, diff = expected_in_result(expected, result)
assert ok, diff
if friendly_traceback._writing_docs:
return result, message
def chain_map_string_by_mistake():
from collections import ChainMap
beta = ChainMap({(0, 0): "origin"}, {})
try:
beta.pop("(0, 0)")
except KeyError as e:
friendly_traceback.explain_traceback(redirect="capture")
result = friendly_traceback.get_output()
assert "KeyError: '(0, 0)'" in result
if friendly_traceback.get_lang() == "en":
expected = "Did you convert `(0, 0)` into a string by mistake?"
ok, diff = expected_in_result(expected, result)
assert ok, diff
def test_String_by_mistake():
chain_map_string_by_mistake() # do not show in docs
d = {(0, 0): "origin"}
try:
d["(0, 0)"]
except KeyError as e:
message = str(e)
friendly_traceback.explain_traceback(redirect="capture")
result = friendly_traceback.get_output()
assert "KeyError: '(0, 0)'" in result
if friendly_traceback.get_lang() == "en":
expected = "Did you convert `(0, 0)` into a string by mistake?"
ok, diff = expected_in_result(expected, result)
assert ok, diff
if friendly_traceback._writing_docs:
return result, message
def test_Forgot_to_convert_to_string():
squares = {"1": 1, "2": 4, "3": 9}
try:
print(squares[2])
except KeyError as e:
message = str(e)
friendly_traceback.explain_traceback(redirect="capture")
result = friendly_traceback.get_output()
assert "KeyError: 2" in result
if friendly_traceback.get_lang() == "en":
expected = "Did you forget to convert `2` into a string?"
ok, diff = expected_in_result(expected, result)
assert ok, diff
if friendly_traceback._writing_docs:
return result, message
def test_Similar_names():
first = {"alpha": 1, "beta": 2, "gamma": 3}
try:
a = first["alpha1"]
except KeyError as e:
message = str(e)
friendly_traceback.explain_traceback(redirect="capture")
result = friendly_traceback.get_output()
assert "KeyError: 'alpha1'" in result
if friendly_traceback.get_lang() == "en":
expected = "Did you mean `'alpha'`?"
ok, diff = expected_in_result(expected, result)
assert ok, diff
second = {"alpha0": 1, "alpha11": 2, "alpha12": 3}
try:
a = second["alpha"]
except KeyError as e:
message = str(e)
friendly_traceback.explain_traceback(redirect="capture")
result = friendly_traceback.get_output()
assert "KeyError: 'alpha'" in result
if friendly_traceback.get_lang() == "en":
expected = "Did you mean `'alpha0'`?"
ok, diff = expected_in_result(expected, result)
assert ok, diff
# The order for alpha11 and alpha12 could vary
expected = "'alpha0'"
ok, diff = expected_in_result(expected, result)
assert ok, diff
expected = "'alpha11'"
ok, diff = expected_in_result(expected, result)
assert ok, diff
expected = "'alpha12'"
ok, diff = expected_in_result(expected, result)
assert ok, diff
if friendly_traceback._writing_docs:
return result, message
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