我安装了 Crypto 模块和 SHA256，但显示 ModuleNotFoundError ：-
回溯（最后一次调用）：文件“Digitalsig.py”，第 1 行，来自 Crypto.Hash 导入 SHA256 ModuleNotFoundError：没有名为“Crypto”的模块
这是参考代码
from Crypto.Hash import SHA256
from Crypto.PublicKey import RSA
from Crypto import Random
random_generator = Random.new().read
#used to generate a keypair which contain a public and private key
keyPair = RSA.generate(1024,random_generator)
pubKey = keyPair.publicKey()
plainText = 'Hello World'
hashA = SHA256.new(plainText).digest()
digitalSignature = keyPair.sign(hashA,'')
print("Hash A: "+repr(hashA) + "\n");
print("Digital Signature: " + repr(digitalSignature) + "\n")
#Bob receives the plainText and digitalSignature from Alice
#plainTextChanged ='Hello World'
hashB =SHA256.new(plainText).digest()
print("Hash B: " + repr(hashB) + "\n")
if(pubKey.verify(hashB, digitalSignature)):
print("Match")
else:
print("No Match")