python - 这段代码有什么问题，为什么不导入魅力？错误是

Question

from charm.toolbox.integergroup import IntegerGroup
from charm.schemes.pkenc.pkenc_rsa import RSA_Enc, RSA_Sig
from charm.core.math.integer import integer, randomBits, random, randomPrime, isPrime, encode, decode, hashInt, bitsize, legendre, gcd, lcm, serialize, deserialize, int2Bytes, toInt

但它给出了错误：

 from charm.schemes.pkenc.pkenc_rsa import RSA_Enc, RSA_Sig
  File "/home/ubuntu/pbc-0.5.14/Charm-Crypto-0.43/charm/schemes/pkenc/pkenc_rsa.py", line 13, in <module>
    from charm.core.math.integer import integer,isPrime,gcd,random,randomPrime,toInt
ImportError: cannot import name 'integer' from 'charm.core.math.integer' (unknown location)