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<noob />
17,062 PointsTrying to understand the solution for this challange
Hi!, so i have a few questions regarding the solution, i was unable to solve it by my self so i looked over a few solutions and i understood the idea of the solution but is till have questions: this is the code:
def word_count(string):
fixed_string = string.lower().split()
d = {}
for key in fixed_string:
count = 0
for value in fixed_string:
if value == key:
count +=1
print(value,key)
d[key] = count
return d
print(word_count("I do not like it Sam I Am"))
questions: I tried to see what actually the value in each time so i printed this is the results: https://gyazo.com/576445af798faf35ff7b978f025f216f I understand that in the first for loop we just loop over the list and the second for loop is meant to loop again on the list to see if the values are equal and if the value in the first for loop is equal to the value in the second for loop we increase count. but i dont really know how is it working. 1.#why i need to declare the count here and not outside of the for loop?, i tried to declare it outside of the loop and the counting messed up.
Asian Hospital Application Developer Dave StSomeWhere Steven Parker
8 Answers
Steven Parker
231,275 PointsThe reason to set the count to 0 inside the loop is because you want a separate count for each key. If you kept adding to to count for every key, then they would all be too large.
<noob />
17,062 Pointshow the coutn is not rested lets say when when we get to the last "I" in the sentence if the count of each key is rested to 0 evrey iteration? im sorry i know its a stupid question
Steven Parker
231,275 PointsThe count does reset to 0 for every key with the code as shown above. But if you move the assignment outside the loop, it is only set to 0 one time before the loop starts, and then it would keep building up from then on.
<noob />
17,062 Pointslol i got confused again. each time the count does reset for each key, i didnt moved the count outside of the loop and it passed teh code challnages
Steven Parker
231,275 PointsThat's right, the code shown above should pass the challenge as it is. Your original question #1 was why it would not work if you moved the initialization of "count" out of the loop (I didn't see a #2).
<noob />
17,062 Pointsyou didnt understand my question, as the code now, each time count is set to 0 , what i want to know is how in the sentence: print(word_count("I do not like it Sam I Am")) this is basically : [I,DO, NOT, LIKE, IT, SAM, I , AM]
lets take the I key for example, it appear 2 times in the string, so if we do the iteration for the first I , then the output is now i =1, when we get to the seonc I, the I count is rest to 0 is it not?, that's what hard for me to understand how it builts up to 2 if its considered as a new key
Steven Parker
231,275 PointsThere are two "I"s in the phrase. So each time the key is "I", the count is first set to 0 in the outer loop, and then the inner loop runs and builds it up to 2.
It doesn't matter how many times any "key" appears. Every time, the inner loop will give the same count.
<noob />
17,062 Pointsthe counts inside the inner loop and in the outer loop are 2 different counts?
Steven Parker
231,275 PointsSame "count". The outer loop sets it to 0 and the inner loop builds it up. Then the outer loop saves it in the new "d" dictionary before moving on to the next "key".
<noob />
17,062 PointsThanks i finally understand it!
Andrew Bickham
1,461 PointsI was wondering if i could possibly ask a question concerning this code?
<noob />
17,062 PointsAndrew Bickham yes
Andrew Bickham
1,461 Pointsthe only thing I didn't quite understand about this code was why the key and value had to be the same ex: if key == value:
<noob />
17,062 PointsAndrew Bickham u check if the key is equal to the value because the outer loop is selecting each word and the innerloop is counting how many times it occurs
Andrew Bickham
1,461 Pointsoooooooooooohhh, okay thank you bot .net
<noob />
17,062 Points<noob />
17,062 PointsSteven Parker just to be sure i understood this, lets say we in the first iteration of fixed_string i have key which is "steven" then for this key i set his count to 0?
and why we nested the for loops?
Steven Parker
231,275 PointsSteven Parker
231,275 PointsYes, you first set the count to 0, but then the inner loop will total up the count of how many times that key is found. Then, when the outer loop moves on to the next key, it starts a new count from 0.
Nested loops is not the only strategy you can use for this task, but here the outer one is selecting each word and the inner one is counting how many times it occurs.