CODEWITHSUNDEEP
pythonlistpython-2.7
namor
namor

Reputation: 97

Iterate over a list of floats

I have a list of floating point numbers that I need to iterate over and find the lowest out of the last 4 numbers

list = [1.1344, 1.254, 1.654, 1.2335, 1.43545]`

for i in list [-4]:

    print i

but I keep getting: 

TypeError: 'float' object is not iterable

Upvotes: 2

Views: 13066

Answers (3)

Scantlight
Scantlight

Reputation: 253

when you reference a specific element in a list you specify his position, by index. positive index value means that count should start from left to right, negative number means that count should start from right to left.

a = [0.1, 1.1, 2.1, 3.1, 4.1]
b = a[-4]
print(b)
# this will print 1.1

so you refer to one element but not to a range of elements in original list.

To get a slice of a you should use something like this

a = [0.1, 1.1, 2.1, 3.1, 4.1]
b = a[-4:]
print(b)
# this will print [1.1, 2.1, 3.1, 4.1]

so, to refer a range of elements you should indicate that range and it can be done in this way list[start_index:end_index] (note semicolons)

Iterate through a list of integers, strings or a list of floats isn't something diferent. They are all handled in the same way, you just have a syntax error, that is. check for line with the explanation in mind.

UPDATE:
you can use min function to get minimum value from a list of elements without iterating through elements. it would be something like this min_value = min(list[-4:])

Upvotes: 4

Michael Robellard
Michael Robellard

Reputation: 2358

The first part of a slice is the beginning. If you don't supply a second part it just gets that element try the following:

for i in list [-4:]:

Upvotes: 0

Justin Niessner
Justin Niessner

Reputation: 245419

Right now, your code only fetches the fourth last item from the list.

If you want to fetch the last four elements from the array to iterate over, you need to change the code a hair:

for i in list[-4:]:
    print i

Upvotes: 0

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