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import numpy as np

if __name__ == "__main__":

arr1 = np.array([1, 2, 3], dtype=np.float64)

arr2 = np.array([1, 2, 3], dtype=np.int32)

print(arr1, arr1.dtype)

print(arr2, arr2.dtype)

arr = np.array([1, 2, 3, 4, 5])

print(arr.dtype)

float_arr = arr.astype(np.float64)

print(float_arr, float_arr.dtype)

arr = np.array([3.7, -1.2, -2.6, 0.5, 12.9, 10.1])

print(arr, arr.dtype)

print(arr.astype(np.int32))

numeric_strings = np.array(["1.25", "-9.6", "42"], dtype=np.string_)

print(numeric_strings.astype(float))

int_array = np.arange(10)

print(int_array, int_array.dtype)

calibers = np.array([0.22, 0.270, 0.357, 0.380, 0.44, 0.50], dtype=np.float64)

print(int_array.astype(calibers.dtype))

empty_uint32 = np.empty(8, dtype="u4")

print(empty_uint32, empty_uint32.dtype)