append python list with only the integer-CodePudding

I have the code below, which works, but I want a list of integers only. How do I get python to only append the integer, and not the (array) portion?

import numpy as np
import matplotlib.pyplot as p

icp4 = np.loadtxt(icp4_img)
ptm = np.loadtxt(ptm_img)

inside, outside = [], []

with np.nditer(icp4, op_flags=['readwrite']) as icp_it, np.nditer(ptm, op_flags=['readonly']) as ptm_it:
    for icp, ptm in zip(icp_it, ptm_it):
        if icp[...] > 800:
            icp[...] = 1
        else:
            icp[...] = 0
        if np.all(icp > 0):
            inside.append(ptm)
        else:
            outside.append(ptm)

p.imshow(icp4, interpolation='nearest', cmap='gray')
p.show()
print(insdie)
>>>[array(435.), array(945.), array(761.)]

CodePudding user response：

It appears that each ptm is a scalar array.

To obtain the scalar equivalent of a scalar array ptm, use ptm.item() (documentation).

So instead of appending ptm to inside, try appending ptm.item().

Alternatively, appending float(ptm) should accomplish the same task. If this needs to be an integer, append int(ptm) instead.

Remark

To obtain the scalar equivalent of a scalar array, one used to be able to use numpy.asscalar(). However, that function is now deprecated. The documentation says to use the item() method instead.

CodePudding user response：

If I understand properly what you are trying to do, you just need to append ptm[0] (i.e the first - and only - integer of the array ptm) instead of ptm.