Is there a "not equal" operator in Python?

How would you say does not equal?

Like

if hi == hi:
    print "hi"
elif hi (does not equal) bye:
    print "no hi"

Is there something equivalent to == that means "not equal"?

Use !=. See comparison operators. For comparing object identities, you can use the keyword is and its negation is not.

e.g.

1 == 1 #  -> True
1 != 1 #  -> False
[] is [] #-> False (distinct objects)
a = b = []; a is b # -> True (same object)

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Not equal != (vs equal ==)

Are you asking about something like this?

answer = 'hi'

if answer == 'hi':     # equal
   print "hi"
elif answer != 'hi':   # not equal
   print "no hi"

This Python - Basic Operators chart might be helpful.

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There's the != (not equal) operator that returns True when two values differ, though be careful with the types because "1" != 1. This will always return True and "1" == 1 will always return False, since the types differ. Python is dynamically, but strongly typed, and other statically typed languages would complain about comparing different types.

There's also the else clause:

# This will always print either "hi" or "no hi" unless something unforeseen happens.
if hi == "hi":     # The variable hi is being compared to the string "hi", strings are immutable in Python, so you could use the 'is' operator.
    print "hi"     # If indeed it is the string "hi" then print "hi"
else:              # hi and "hi" are not the same
    print "no hi"

The is operator is the object identity operator used to check if two objects in fact are the same:

a = [1, 2]
b = [1, 2]
print a == b # This will print True since they have the same values
print a is b # This will print False since they are different objects.

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You can use both != or <>.

However, note that != is preferred where <> is deprecated.

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Seeing as everyone else has already listed most of the other ways to say not equal I will just add:

if not (1) == (1): # This will eval true then false
    # (ie: 1 == 1 is true but the opposite(not) is false)
    print "the world is ending" # This will only run on a if true
elif (1+1) != (2): #second if
    print "the world is ending"
    # This will only run if the first if is false and the second if is true
else: # this will only run if the if both if's are false
    print "you are good for another day"

in this case it is simple switching the check of positive == (true) to negative and vise versa...

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Comments
  • Are you asking about else, != (optionally <>) or is not?
  • Attention that <> doesn't work any more in python 3, so use !=
  • from python documentation: Python3 : The operators <, >, ==, >=, <=, and != compare the values of two objects. docs.python.org/3/reference/expressions.html#value-comparisons
  • from python documentation: python2: docs.python.org/2/reference/expressions.html#not-in
  • How would you compare two binary data?
  • Just some info, PEP401 mentioned in the comments was an April Fool joke. <> is not supported in Python3 now.
  • Just for the record: Comparison operators in Python 3.7
  • Note that is not won't work for string comparison
  • this answer is basically a copy of the one @user128364 gave before.
  • What value would you assign to the variables hi and bye? Whatever it would be, the elif clause would never be reached. Lastly, this example does not clearly provide an answer to the question.