TypeError: list indices must be integers or slices, not float in Python
Dung Do Tien
Sep 07 2021
194
Hello you guys, I am a newbie in Python and I'm also studying more about Python.
I have a small assignment, I write a small project help me find some user existed in an array, I want to apply binary search algorithm to help me search faster. Like this:
position = 0
def main():
names = ['A Name', 'B Name', 'C meah', 'D Name',
'E Name', 'G Name', 'M Fullname',
'Ross Name', 'Sasha Name', 'Xavier Name']
entered = input('Enter name to search:')
binary_search(names, entered)
if position == -1:
print("Name entered is not found.")
else:
print(entered, " is part of the list and is number ", position, " on the list.")
input('Press<enter>')
def binary_search(names, entered):
first = 0
last = len(names) - 1
position = -1
found = False
while not found and first <= last:
middle = (first + last) / 2
if names[middle] == entered:
found = True
position = middle
elif names[middle] > entered:
last = middle - 1
else:
first = middle + 1
return position
main()
But I get an exception TypeError: list indices must be integers or slices, not float when I run code above.
Enter name to search:A Name
Traceback (most recent call last):
File "main.py", line 35, in <module>
main()
File "main.py", line 8, in main
binary_search(names, entered)
File "main.py", line 25, in binary_search
if names[middle] == entered:
TypeError: list indices must be integers or slices, not float
And I am using python 3.8.2
Anyone can explain it to me? How can I solve it?
Thanks for any response.
Have 1 answer(s) found.
-
Y-3
Yusuf Bashir Sep 07 2021
This error throw is related to set an index to get an item from an array.
You need to change the line code below:
middle = (first + last) / 2To
middle = int((first + last) / 2)And it resolved for you.
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