CODEWITHSUNDEEP
pythonpython-3.xloopsrange
ShahAlam
ShahAlam

Reputation: 75

Code for looping through a list without exceeding range

I am trying to solve the following problem in Python 3.

Loop through each element in word_list, printing the current element and the next element, separated by a space, in each loop

The problem is that I exceed the range when I get to the last index, but am not sure how to modify the range object to fix this problem. Any ideas on how to modify this?

Code:

word_list=["Willie", "likes", "sleeping", "and", "eating"]
phrase_str=""
for i in range(len(word_list)):
    phrase_str= word_list[i] + " " + word_list[i+1]
    print(phrase_str)

Output

Willie likes 
likes sleeping 
sleeping and 
and eating

Error

IndexError                                Traceback (most recent call last)
<ipython-input-28-aba2a7894c1a> in <module>
      2 phrase_str=""
      3 for i in range(len(word_list)):
----> 4     phrase_str= word_list[i] + " " + word_list[i+1]
      5     print(phrase_str)
      6 

IndexError: list index out of range
​

Upvotes: 0

Views: 840

Answers (3)

Zain Arshad
Zain Arshad

Reputation: 1907

If you are coding in python always use "Pythonic" approach:

word_list=["Willie", "likes", "sleeping", "and", "eating"]
for w1, w2 in zip(word_list, word_list[1:]):
    print(w1, w2)

Output:

Willie likes
likes sleeping
sleeping and
and eating

Upvotes: 3

jimmie_roggers
jimmie_roggers

Reputation: 173

Hi this is an arbitary error!

this is the length of the lsit

The length of the list is 5, however indexing starts at 0, so the first element corresponds with index 0. hence the list range is out of bounds, juat use [len(word_list) - 1] and lop through! Hope this helps!

Upvotes: 1

Sibyl
Sibyl

Reputation: 145

if you make len(word_list) - 1 it won't come to the end of list

word_list=["Willie", "likes", "sleeping", "and", "eating"]
phrase_str=""
for i in range(len(word_list) - 1):
    phrase_str= word_list[i] + " " + word_list[i+1]
    print(phrase_str)

Upvotes: 1

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