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​x
 
x = "welcome"
​
#if condition returns False, AssertionError is raised:
assert x != "welcome", "x should not be 'welcome'"
​
Traceback (most recent call last):
  File "demo_ref_keyword_assert2.py", line 4, in <module>
    assert x != "welcome", "x should not be 'welcome'"
AssertionError: x should not be 'welcome'