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pythonlistappend
Trubsworth
Trubsworth

Reputation: 45

Python creating a list with variable size which contains floating points

I want to be able to create a 2d list with a variable size.

test = [[]]

The problem is the data I want to put inside of it is a floating point. This makes it incompatible with the append function

                TempData[0] = 1
                TempData[1] = 2.32
                TempData[2] = 3.65
                test.append(float(TempData))

Is There any way around this? I don't really want to declare a huge list because sometimes the 2D list size may be very big or very small.

Upvotes: 1

Views: 834

Answers (2)

Picachieu
Picachieu

Reputation: 3782

The python array module is made specifically for the purpose of holding numeric values. Here is an example using a list and an array.array:

import array
mylist = []
mylist.append(array.array('f', [1.43, 1.54, 1.24]))

Upvotes: 0

Brandon Schabell
Brandon Schabell

Reputation: 1925

It looks like your issue is due to passing an object, TempData to a list and then changing the contents of that object. A reference to TempData is stored in the list, not the values contained in that list. When you alter TempData, it alters every element in the list. Instead, try this:

test = []
test.append([1, 2.32, 3.65])
test.append([2.312, 1.231, 1.111])

Upvotes: 2

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