1

在我问我的问题之前，我只想让你们知道我对 Python 很陌生，所以请耐心等待！:)

无论如何，这是我的问题：

我正在编写一些有趣的代码，它调用API并获取最新的比特币 Nonce 数据。我希望能够在我的代码本身中保存过去的几个 nonce 值。

有人建议我使用列表来执行此操作。我已经这样做了，但是每次出现新的 nonce 值时，它都会替换列表中的原始值，而不是添加一个新值。

有没有人知道我做错了什么或者是否有更好的选择？

非常感谢！:D

from __future__ import print_function
import blocktrail, time

def code():

    client = blocktrail.APIClient(api_key="x", api_secret="x", network="BTC", testnet=False)
    address = client.address('x')

    latest_block = client.block_latest()

    nonce = latest_block['nonce']

    blockhash = latest_block['hash']

    print(nonce)

    noncestr = str(nonce)

    noncelist = []
    noncelist.append(noncestr);
    print(noncelist)
    time.sleep(60)

while True:
    code()
4

2 回答 2

2

You are setting noncelist to an empty list each time in the function so obviously you only keep one value in it that you append on the next line, you would need to declare the list outside the function and pass the list in as an argument, using a class may be a better approach making the list an attribute.

import blocktrail, time
class Bit():
    def __init__(self):
        self.nonce_list = []
    def run(self):
        while True:
            client = blocktrail.APIClient(api_key="x", api_secret="x", network="BTC", testnet=False)
            address = client.address('x')
            latest_block = client.block_latest()
            nonce = latest_block['nonce']
            blockhash = latest_block['hash']
            nonce_str = str(nonce)
            self.nonce_list.append(nonce_str)
            print(self.nonce_list)
            time.sleep(60)



Bit().run()

If you want to continually run the code you should probably daemonize the process, also the function continually calling itself is really not a good idea

If you are going to use a function, pass the list in and loop in the function just calling it once:

def code(noncelist):
    while True:
        client = blocktrail.APIClient(api_key="x", api_secret="x", network="BTC", testnet=False)
        address = client.address('x')
        latest_block = client.block_latest()
        nonce = latest_block['nonce']
        blockhash = latest_block['hash']    
        print(nonce)   
        noncestr = str(nonce)
        noncelist.append(noncestr)
        print(noncelist)
        time.sleep(60)


code([])

If you just want unique nonce's use a set to keep track of what has been added, I made created an example of using a class with multiple attributes, you will need to catch more possible exceptions:

import blocktrail, time


class Bit():
    def __init__(self, key, secret, net, retry_fail=1, update=60,max_fail=10):
        self.nonce_list = []
        self.seen = set()
        self.key = key
        self.secret = secret
        self.net = net
        self.key = key
        self.retry_fail = retry_fail
        self.update = update
        self.max_fails = max_fail

    def connect(self):
          return blocktrail.APIClient(api_key=self.key, api_secret=self.secret, network=self.net, testnet=False)

    def run(self):
        while True:
            if not self.max_fails:
                break
            try:
                client = self.connect()
                latest_block = client.block_latest()
            except blocktrail.exceptions.MissingEndpoint as e:
                self.max_fails -= 1
                print("Error: {}\n sleeping for {} second(s) before retrying".format(e.msg, self.retry_fail))
                time.sleep(self.retry_fail)
                continue
            nonce = latest_block['nonce']
            if nonce not in self.seen:             
                self.nonce_list.append(nonce)
                self.seen.add(nonce)
            print(self.nonce_list)
            time.sleep(self.update)

The key,secret and net are required, you can pass the other or use the defaults:

Bit("key","secret", "net").run()
于 2015-07-16T12:01:47.910 回答
2

You are emptying the list then appending what do you expect:

noncelist = []
noncelist.append(noncestr);

It can be like this :

noncelist=[]
while True:
    code(noncelist)

Modified code:

from __future__ import print_function
import blocktrail, time

def code(noncelist):

    client = blocktrail.APIClient(api_key="x", api_secret="x", network="BTC", testnet=False)
    address = client.address('x')

    latest_block = client.block_latest()

    nonce = latest_block['nonce']

    blockhash = latest_block['hash']

    print(nonce)

    noncestr = str(nonce)

    noncelist.append(noncestr);
    print(noncelist)
    time.sleep(60)
noncelist=[]
while True:
    code()

More appropriate way would be:

from __future__ import print_function
import blocktrail, time

def code():

    client = blocktrail.APIClient(api_key="x", api_secret="x", network="BTC", testnet=False)
    address = client.address('x')

    latest_block = client.block_latest()

    nonce = latest_block['nonce']

    blockhash = latest_block['hash']

    print(nonce)

    noncestr = str(nonce)
    time.sleep(60)
    return noncestr 
noncelist=[]
while True:
    noncelist.append(code())
    print noncelist
于 2015-07-16T12:02:49.437 回答