$ curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
$ python get-pip.py 
$ sudo yum install libXrender-0.9.10-1.el7.x86_64 --setopt=protected_multilib=false
$ sudo yum install libXext-1.3.3-3.el7.x86_64 --setopt=protected_multilib=false
$ sudo yum install libSM-1.2.2-2.el7.x86_64 --setopt=protected_multilib=false
$ pip2 install opencv-python==4.1.1.26
$ pip install requests
$ pip install Pillow

   public String toBase58() {
       byte[] data = new byte[25];
       data[0] = COIN_VERSION;
       System.arraycopy(toArray(), 0, data, 1, 20);
       byte[] checksum = Digest.sha256(Digest.sha256(data, 0, 21));
       System.arraycopy(checksum, 0, data, 21, 4);
       return Base58.encode(data);
   }

1.过滤emoji表情的原因

Python 定时器

# -*- coding: utf-8 -*-
 
import base64
 
with open("/tmp/img/1.png","rb") as f:
    # b64encode是编码，b64decode是解码
    base64_data = base64.b64encode(f.read())
    # base64.b64decode(base64data)
    print(base64_data)