AttributeError raised inside property of DataFrame hides error source. · Issue #11808 · pandas-dev/pandas (original) (raw)

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Description

When an AttributeError is raised inside a property in DataFrame, regular attribute access fails and __getattr__ in NDFrame is called.
Since the property's attribute name is neither in _internal_names_set nor _info_axis, a new exception is risen and the original stack trace is lost.

import pandas as pd

class A(pd.DataFrame):
@property def foo(self): return 1 / 0

@property
def bar(self):
    return self.i_dont_exist

a = A()

a.foo ZeroDivisionError

a.bar

AttributeError Traceback (most recent call last) in () 12 #a.foo # ZeroDivisionError 13 ---> 14 a.bar # AttributeError: 'A' object has no attribute 'bar' 15 16 #a.i_dont_exist # AttributeError: 'str' object has no attribute 'isnull'

/usr/local/lib/python2.7/dist-packages/pandas/core/generic.pyc in getattr(self, name) 2148 return self[name] 2149 raise AttributeError("'%s' object has no attribute '%s'" % -> 2150 (type(self).name, name)) 2151 2152 def setattr(self, name, value):

AttributeError: 'A' object has no attribute 'bar'

a.i_dont_exist # a.bar should include this in the stack trace: AttributeError: 'A' object has no attribute 'i_dont_exist'

pd.show_versions() INSTALLED VERSIONS

commit: None python: 2.7.9.final.0 python-bits: 64 OS: Linux OS-release: 3.19.0-39-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8

pandas: 0.16.2 nose: 1.3.7 Cython: 0.23.4 numpy: 1.10.1 scipy: 0.16.0 statsmodels: None IPython: 4.0.0 sphinx: None patsy: None dateutil: 2.4.2 pytz: 2015.6 bottleneck: None tables: None numexpr: None matplotlib: 1.4.3 openpyxl: None xlrd: None xlwt: None xlsxwriter: None lxml: None bs4: 4.3.2 html5lib: 0.999 httplib2: 0.9 apiclient: None sqlalchemy: None pymysql: None psycopg2: None