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+--- Thread: Equality in Python (/thread-24244.html)
Equality in Python - el_bueno - Feb-05-2020
Hello!
what is the actual difference between
=
and
==
I have some trouble understanding the actual meaning of theses 2 operators.
Could someone explain it in a simple way?
RE: Equality in Python - michael1789 - Feb-05-2020
Single "=" makes things equal. And "==" compares to see if they are equal.
one = 1vs
if one == 1:
RE: Equality in Python - ndc85430 - Feb-05-2020
= isn't equality, it's assignment - i.e. assigning a value to a variable. a = 1, for example, is a statement. It doesn't return a value; it just sets the value of a to 1.== checks whether the values on the left hand and right hand sides are equal. 1 == 2, for example, is an expression. It does return a value (i.e. False in this case) and can be used in other expressions.
RE: Equality in Python - el_bueno - Feb-05-2020
An exemple with num%2==0
liist=[0,1,2,3,4,5,6,7,8,9,10]
summ=0
for num in liist:
if num%2==0:
print(f'that\'s a even number : {num}')
else:
print(f'That\'s an odd number : {num}')
here if num%2==0 why cant I use a single equal signe "="?
RE: Equality in Python - michael1789 - Feb-05-2020
(Feb-05-2020, 08:03 PM)el_bueno Wrote: here if num%2==0 why cant I use a single equal signe "="?
You already have two answers from two people to that exact question. The better question is "why do you think you should be able to use a single '='?" Why do you?
RE: Equality in Python - el_bueno - Feb-05-2020
Maybe, but I reaaly need to make sure I did understand the difference between the two, so when I'll code Iwont stumble and think why do we choose that over the other.
RE: Equality in Python - jim2007 - Feb-06-2020
Think of it this way, you are learning a foreign language and in this new language the word for equal is == and the word for assignment is = and that is it. Just as equals and assignment are not related in English neither are == and = in Python. They are two completely different concepts in both languages.
RE: Equality in Python - DeaD_EyE - Feb-06-2020
Some facts, that not many people knows:
for i in range(100):
# ^ assignment to name i
passwith open('some_file.txt') as fd:
# ^^ assignment to name fd
pass[x for x in range(100)] # ^ assignment to name x
def foo(a, b):
# ^^^ assignment of the function to the name foo
# ^ assignment to name a
# ^ assignment to name b
passclass Foo:
# ^^^ assignment of class to name Foo
passWhat we call variables, are just names. We assign an object (lives somewhere in memory) to a name.
RE: Equality in Python - el_bueno - Feb-08-2020
Thank you so much, guys.
it really help me .
@jim2007 yes its a new language. I've learnt 4 languages and yes in the beginning we tend to think with the learnt language and try to apply its grammar to the new language, thats what I was doing.