Difference between is and == in Python
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Difference between is and == In python, is is used to check for identity and == is used to check for equality.
is will return True if two variables point to the same object.
== will return True if the objects referred to by the variables are equal.
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difference between == and is >>> list1 = [1, 2, 3]list2 is list1 returned True because both list1 and list2 refer to the same object as they have the same memory address (on this machine, it is 0x2faaf857e00)
>>> list2 = list1
>>> list2 is list1
True
>>> hex(id(list1))
0x2faaf857e00
>>> hex(id(list2))
0x2faaf857e00
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difference between is and == >>> list1 = [1, 2, 3]list2 is list1 returned False because list1 and list2 are different object and they have different memory addresses (on this machine, list1 is stored at 0x2faaf896300 and list2 at 0x2faaf900dc0)
>>> list2 = list1[:]
>>> list2 is list1
False
>>> hex(id(list1))
0x2faaf896300
>>> hex(id(list2))
0x2faaf900dc0
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What is the difference between difference between is and == >>> list1 = [1, 2, 3]List2 == list1 returned True because both list1 and list 2 have the same value (in this example, [1, 2, 3])
>>> list2 = list1
>>> list2 == list1
True
>>> list1
[1, 2, 3]
>>> list2
[1, 2, 3]
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is Vs == >>> list1 = [1, 2, 3]List2 == list1 returned True because both list1 and list 2 have the same value (in this example, [1, 2, 3])
>>> list2 = list1[:]
>>> list2 == list1
True
>>> list1
[1, 2, 3]
>>> list2
[1, 2, 3]
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== Vs is The operator is and its counterpart is not are used for checking object identity, they check if objects refer to the same instance (same address in memory).
The operator == and its counterpart != are used for checking equality (same value), they check if objects have same value or not. -
difference between is and == in Python As a rule of thumb, a is b implies a == b (except for odd things like floating point NaNs that compare inequal to themselves).- a == b does not imply a is b.
- Operator is cannot be overloaded.
- Operator == can be overloaded.
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difference between is and == in Python Small integers (-5 to 256) behaves differently because CPython implementation optimizes the storage of integers in the range (-5 to 256) by making them singletons. Each (small) integer value is mapped to a single value, so every 3 is identical and equal. This is an implementation detail, not part of the language specification.
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difference between == and is in Python Comparisons to singletons like None should always be done with is or is not, never the equality operators
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difference between is and == in Python == is typically used to see equality of
- integers
- floats
- strings
- lists
- sets
- dictionaries