My Python code generates a list everytime it loops:
list = np.genfromtxt('temp.txt', usecols=3, dtype=[('floatname','float')], skip_header=1)
But I want to save each one - I need a list of lists right?
So I tried:
list[i] = np.genfromtxt('temp.txt', usecols=3, dtype=[('floatname','float')], skip_header=1)
But Python now tells me that "list" is not defined. I'm not sure how I go about defining it. Also, is a list of lists the same as an array??
Thank you!
You want to create an empty list, then append the created list to it. This will give you the list of lists. Example:
>>> l = []
>>> l.append([1,2,3])
>>> l.append([4,5,6])
>>> l
[[1, 2, 3], [4, 5, 6]]
Create your list before your loop, else it will be created at each loop.
>>> list1 = []
>>> for i in range(10) :
... list1.append( range(i,10) )
...
>>> list1
[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [1, 2, 3, 4, 5, 6, 7, 8, 9], [2, 3, 4, 5, 6, 7, 8, 9], [3, 4, 5, 6, 7, 8, 9], [4, 5, 6, 7, 8, 9], [5, 6, 7, 8, 9], [6, 7, 8, 9], [7, 8, 9], [8, 9], [9]]
Use append method, eg:
lst = []
line = np.genfromtxt('temp.txt', usecols=3, dtype=[('floatname','float')], skip_header=1)
lst.append(line)
First of all do not use list
as a variable name- that is a builtin function.
I'm not super clear of what you're asking (a little more context would help), but maybe this is helpful-
my_list = []
my_list.append(np.genfromtxt('temp.txt', usecols=3, dtype=[('floatname','float')], skip_header=1))
my_list.append(np.genfromtxt('temp2.txt', usecols=3, dtype=[('floatname','float')], skip_header=1))
That will create a list (a type of mutable array in python) called my_list
with the output of the np.getfromtext()
method in the first 2 indexes.
The first can be referenced with my_list[0]
and the second with my_list[1]
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