问题描述

运行代码会出现警告信息

numba cannot be imported and numba functions are disabled.
Probably the execution is slow.
Please install numba to gain a massive speedup.
(or if you prefer slow execution, set the flag numba=False to avoid this warning!)

即使把numba的import注释掉也还是会有这个警告、卸载numba也还是有，安装之后import还有警告。

python 3.10.11 numba-0.58.1 numpy-1.26.3 pandapower-2.13.1

复现步骤

上述环境运行以下代码

"""
https://discourse.jupyter.org/t/numba-module-cannot-be-imported-properly/19353

numba cannot be imported and numba functions are disabled.
Probably the execution is slow.
Please install numba to gain a massive speedup.
(or if you prefer slow execution, set the flag numba=False to avoid this warning!)
"""
import pandapower as pp
import numba 
net = pp.create_empty_network() 
b1 = pp.create_bus(net, vn_kv=20.)
b2 = pp.create_bus(net, vn_kv=20.)
pp.create_line(net, from_bus=b1, to_bus=b2, length_km=2.5, std_type="NAYY 4x50 SE")   
pp.create_ext_grid(net, bus=b1)
pp.create_load(net, bus=b2, p_mw=1.)
pp.runpp(net)	# 警告诞生处

排查过程

1. 单纯使用numpy和pandapower不会有numba警告，为了测试这个，可以用以下代码证明

import numpy as np
import pandapower as pp
import pandapower.networks as networks
from numpy.linalg import matrix_power
from pandapower import runpp

np.random.seed(42)
np.ones(5)
# Define a 2x2 matrix
A = np.array([[2, 3], [4, 5]])

# Define the power of the matrix (in this case, A^2)
A_power_2 = matrix_power(A, 2)
print("Original matrix A:")
print(A)

print("\nMatrix A raised to the power of 2:")
print(A_power_2)


# create empty net
net = pp.create_empty_network()

# create buses
b1 = pp.create_bus(net, vn_kv=20., name="Bus 1")
b2 = pp.create_bus(net, vn_kv=.4, name="Bus 2")
b3 = pp.create_bus(net, vn_kv=.4, name="Bus 3")

# create bus elements
pp.create_ext_grid(net, bus=b1, vm_pu=1.02, name="Grid Connection")
pp.create_load(net, bus=b3, p_kw=100, p_mw=80, q_kvar=50, name="Load")

# create branch elements
tid = pp.create_transformer(net, hv_bus=b1, lv_bus=b2, std_type="0.4 MVA 20/0.4 kV", name="Trafo")
pp.create_line(net, from_bus=b2, to_bus=b3, length_km=.1, name="Line", std_type="NAYY 4x50 SE")


# Load a pre-defined power grid network
net = networks.case33bw()# io_utils.py:509: FutureWarning
print("Loaded network data:")
print(net)

2. 版本兼容性问题

尝试安装 numbda 0.58.1 后取消注释还是会报警告，确认可以import；尝试 numba-0.58.0 numpy-1.25.2 后也是报警告；numba-0.57.0 numpy-1.24.4 也报警告；numba-0.56.0 numpy-1.22.4 则不报警告

结论

版本兼任问题，pandapower-2.13.1 和numba的0.57-0.58.1有，前者issue注意到了后者version接口变更了，待后续修复，现在可先用 numba-0.56.0