Len Quiz Solution - Intro to Computer ScienceYouTube↗  IA↗(long shot)
Education  9.7K views 14 likes 0 dislikes   29 May 2012
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[Narrator] The answer is 5.
[الراوي] الإجابة 5.
Let's step through each statement to see why.
دعونا نبدأ من خلال كل عبارة لمعرفة السبب.
The first statement creates a new list.
تنشئ العبارة الأولى قائمة جديدة.
It's elements are 1 and 2, and makes the variable P refer to that list.
عناصرها 1 و2، وتجعل المتغير P يشير إلى هذه القائمة.
The next statement evokes append on P, passing in the value 3.
تستدعي العبارة التالية مُلحقًا على P مع تمرير القيمة 3.
Append adds an element to the end of the list,
يضيف المُلحق عنصرًا إلى نهاية القائمة،
so after this the value that P refers to will include 1 extra element with the value 3.
بعد ذلك ستشمل القيمة التي يشير إليها P عنصرًا واحدًا إضافيًا بالقيمة 3.
The next statement uses the plus operator.
تستخدم العبارة التالية عامل plus.
The operands to the plus are P, which we already have,
معاملات plus هي P، وهي ما لدينا بالفعل،
and the new list containing the elements 4 and 5,
والقائمة الجديدة التي تحتوي على العناصر 4 و5،
and remember what happens with plus; it doesn't mutate any of the inputs.
وتذكروا ما يحدث مع plus؛ أنها لا تغير أي من المُخرجات.
It creates a new list that consists of all the elements concatenated together.
إنها تنشئ قائمة جديدة تتكون من كل العناصر متسلسلة معًا.
That will be this 5-element list.
ستكون النتيجة قائمة العناصر الخمسة تلك.
We assign that to the variable P, so now P will no longer refer to the list 1, 2, 3.
نُعيّن ذلك للمتغير P، والآن لن يشير P بعد الآن القائمة 1 و2 و3.
It will refer to this new list that has 5 elements,
سيشير إلى هذه القائمة الجديدة التي بها 5 عناصر،
and at the end of this, the len of P is 5, since there are 5 elements in P.
وفي نهاية ذلك، يصبح len بقيمة 5، لأنه توجد 5 عناصر في P.
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