python array/cell/indexing

[DeaD_EyE]

With numpy:

import numpy as np
shape = (2,5)
arr1 = np.zeros(shape)
print(arr1)

With stock Python:

shape = (2,5)
arr2 = []
fill_value = 0
for a in range(shape[0]):
    row = []
    for b in range(shape[1]):
        row.append(fill_value)
    arr2.append(row)
print(arr2)

Accessing multi dimensional lists with stock Python:

arr2[0][1]
arr2[0][0:2]

Same with numpy:

arr1[0,1]
arr1[0,0:2]

More complex stuff with numpy:

arr1[:,::2]

Returns all rows, from each row the even fields are selected.