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12 changes: 6 additions & 6 deletions prettytable/prettytable.py
Original file line number Diff line number Diff line change
Expand Up @@ -421,7 +421,7 @@ def align(self):
def align(self, val):
if not self._field_names:
self._align = {}
elif val is None or (isinstance(val, dict) and len(val) is 0):
elif val is None or (isinstance(val, dict) and len(val) == 0):
for field in self._field_names:
self._align[field] = "c"
else:
Expand All @@ -441,7 +441,7 @@ def valign(self):
def valign(self, val):
if not self._field_names:
self._valign = {}
elif val is None or (isinstance(val, dict) and len(val) is 0):
elif val is None or (isinstance(val, dict) and len(val) == 0):
for field in self._field_names:
self._valign[field] = "t"
else:
Expand All @@ -459,7 +459,7 @@ def max_width(self):

@max_width.setter
def max_width(self, val):
if val is None or (isinstance(val, dict) and len(val) is 0):
if val is None or (isinstance(val, dict) and len(val) == 0):
self._max_width = {}
else:
self._validate_option("max_width", val)
Expand Down Expand Up @@ -489,7 +489,7 @@ def min_width(self):

@min_width.setter
def min_width(self, val):
if val is None or (isinstance(val, dict) and len(val) is 0):
if val is None or (isinstance(val, dict) and len(val) == 0):
self._min_width = {}
else:
self._validate_option("min_width", val)
Expand Down Expand Up @@ -687,7 +687,7 @@ def int_format(self):

@int_format.setter
def int_format(self, val):
if val is None or (isinstance(val, dict) and len(val) is 0):
if val is None or (isinstance(val, dict) and len(val) == 0):
self._int_format = {}
else:
self._validate_option("int_format", val)
Expand All @@ -704,7 +704,7 @@ def float_format(self):

@float_format.setter
def float_format(self, val):
if val is None or (isinstance(val, dict) and len(val) is 0):
if val is None or (isinstance(val, dict) and len(val) == 0):
self._float_format = {}
else:
self._validate_option("float_format", val)
Expand Down