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omar talaat
Courses Plus Student 171 Pointsin quiz 1 why variable = value why not double the equal sign as i assign a value like 5 to my variable
i assign a value like any number to my variable so why not double equal
2 Answers
Jeff Muday
Treehouse Moderator 28,722 PointsThe double equal is a test for logical/value equivalence. If you use it by itself and x hasn't been assigned a value, it will throw a name error. x = 2 assigns a value to variable x. After it is assigned x==2 returns the logical/value test of equivalence to 2.
I hope this helps your understanding.
Python 2.7.12 (default, Nov 19 2016, 06:48:10)
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> x == 2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'x' is not defined
>>> x = 2
>>> x
2
>>> x == 2
True
>>>
Kobi Michaeli
31,461 Pointsone = , meaning assign in python two ==, meaning check if equal to...
these two meanings (= for assign, and == for check if equal) are true for most programming languages
three ===, has no meaning in python but in JS for check if value is equal and also if it the same type