NumPy memory address experiments

numpy_memory.py

# NumPy memory experiments
import numpy as np

a = np.random.rand(1, 2, 3)
b = np.asarray(a)  # no copy!
c = np.array(a)  # copy!

# The array interface is a map that has a 'data' key returning
# a tuple containing a pointer to the memory address and a
# return flag.
print(hex(a.__array_interface__['data'][0]))
print(hex(b.__array_interface__['data'][0]))  # no copy!
print(hex(c.__array_interface__['data'][0]))  # copy!


# ---

import numpy as np
import pandas as pd

a = np.random.rand(10,20)
df = pd.DataFrame(a)
b = np.asarray(df)  # no copy!
c = df.values  # no copy!
d = np.array(df)  # copy!

print(hex(a.__array_interface__['data'][0]))
print(hex(b.__array_interface__['data'][0]))  # no copy!
print(hex(c.__array_interface__['data'][0]))  # copy!
print(hex(d.__array_interface__['data'][0]))  # copy!