属性错误：“ NoneType”对象没有属性“ find”_python

尝试运行此代码时，我一直遇到问题。 有一些帮助，但仍然无法正常工作。 请帮忙：）

完整代码：

#!/usr/bin/env python3
from __future__ import print_function
try:
    import pymarketcap
    import decimal
    from operator import itemgetter
    import argparse
except Exception as e:
    print('Make sure to install {0} (pip3 install {0}).'.format(str(e).split("'")[1]))
    exit()

# arguments and setup
parser = argparse.ArgumentParser()
parser.add_argument('-m','--minimum_vol',type=float,help='Minimum Percent volume per exchange to have to count',default=1)
parser.add_argument('-p','--pairs',nargs='*',default=[],help='Pairs the coins can be arbitraged with - default=all')
parser.add_argument('-c','--coins_shown',type=int,default=10,help='Number of coins to show')
parser.add_argument('-e','--exchanges',nargs='*',help='Acceptable Exchanges - default=all',default=[])
parser.add_argument('-s','--simple',help='Toggle off errors and settings',default=False,action="store_true")
args = parser.parse_args()
cmc = pymarketcap.Pymarketcap()
info = []
count = 1
lowercase_exchanges = [x.lower() for x in args.exchanges]
all_exchanges = not bool(args.exchanges)
all_trading_pairs = not bool(args.pairs)
coin_format = '{: <25} {: >6}% {: >10} {: >15} {: <10} {: <10} {: <15} {: <5}'

if not args.simple:
    print('CURRENT SETTINGS\n* MINIMUM_PERCENT_VOL:{}\n* TRADING_PAIRS:{}\n* COINS_SHOWN:{}\n* EXCHANGES:{}\n* ALL_TRADING_PAIRS:{}\n* ALL_EXCHANGES:{}\n'.format(args.minimum_vol,args.pairs,args.coins_shown,lowercase_exchanges,all_trading_pairs,all_exchanges))
# retrieve coin data
for coin in cmc.ticker():
    try:
        markets = cmc.markets(coin["id"])
    except Exception as e:
        markets = cmc.markets(coin["symbol"])
    best_price = 0

    best_exchange = ''
    best_pair = ''
    worst_price = 999999
    worst_exchange = ''
    worst_pair = ''
    has_markets = False
    for market in markets:
        trades_into = market["pair"].replace(str(coin["symbol"])," ").replace("-"," ")
        if market['percent_volume'] >= args.minimum_vol and market['updated'] and (trades_into in args.pairs or all_trading_pairs) and (market['exchange'].lower() in lowercase_exchanges or all_exchanges):
            has_markets = True
            if market['price_usd'] >= best_price:
                best_price = market['price_usd']
                best_exchange = market['exchange']
                best_pair = trades_into
            if market['price_usd'] <= worst_price:
                worst_price = market['price_usd']
                worst_exchange = market['exchange']
                worst_pair = trades_into
    if has_markets:
        info.append([coin['name'],round((best_price/worst_price-1)*100,2),worst_price,worst_exchange,worst_pair,best_price,best_exchange,best_pair])
    elif not args.simple:
        print(coin['name'],'had no markets that fit the criteria.')

    print('[{}/100]'.format(count),end='\r')
    count += 1

# show data
info = sorted(info,key=itemgetter(1))[::-1]
print(coin_format.format("COIN","CHANGE","BUY PRICE","BUY AT","BUY WITH","SELL PRICE","SELL AT","SELL WITH"))
for coin in info[0:args.coins_shown]:
    print(coin_format.format(*coin))

我不断收到这2个错误：

  File "./run", line 33, in <module>
    markets = cmc.markets(coin["id"])
  File "/Users/alex/anaconda3/lib/python3.6/site-packages/pymarketcap/core.py", line 296, in markets
    marks = html.find(id="markets-table").find("tbody").find_all('tr')
AttributeError: 'NoneType' object has no attribute 'find'

During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "./run", line 35, in <module>
    markets = cmc.markets(coin["symbol"])
  File "/Users/alex/anaconda3/lib/python3.6/site-packages/pymarketcap/core.py", line 296, in markets
    marks = html.find(id="markets-table").find("tbody").find_all('tr')
AttributeError: 'NoneType' object has no attribute 'find'

任何帮助将不胜感激。 谢谢之前在我之前的问题上得到了很大的帮助，但仍然没有解决方案。

我认为问题是，如果对于某些硬币，找不到任何东西（无论您使用coin["id"]还是coin["symbol"] ），这可能是由内置的无效链接引起的ticker模块（coinmarketcap.com/currencies/）。 在这种情况下

markets = cmc.markets(coin["id"])

markets = cmc.markets(coin["symbol"])

都将抛出AttributeError。 您应该将代码更改为

for coin in cmc.ticker():
    try:
        # this call can fail
        markets = cmc.markets(coin["id"])
    except AttributeError as e:
        try:
            # second call could also fail
            markets = cmc.markets(coin["symbol"])
        except AttributeError as e1:
            print("Nothing found for " + coin["id"])
            continue #skip this coin?
    best_price = 0

我尝试了您的代码，但对于名为janus的硬币失败了，当您手动尝试链接时，将显示PageNotFound ，这将解释为什么它不起作用。

NoneType意味着实际上没有None ，而不是您认为正在使用的任何Class或Object的实例。 这通常意味着在上面的赋值或函数调用失败或返回了意外结果。

为了进一步调查，我建议您打印响应及其以下表达式的类型：

for coin in cmc.ticker():
    try:
        markets = cmc.markets(coin["id"])
    except Exception as e:
        markets = cmc.markets(coin["symbol"])
    best_price = 0
print(markets)
print(type(markets))

这不会解决您的问题，但是可能使您了解困扰您的代码行。 您还可以根据错误原因对它进行进一步调试。 并且，如果问题仍然存在，您可以编辑问题并发布进一步评估的代码/回溯电话，这将帮助我们（社区成员）帮助您解决问题。

通常，python中存在无法迭代的数据类型，可能需要以某种可迭代的方式（例如，字典，列表）对它进行类型转换，或者在您的情况下使用属性来访问给定索引的值。

希望能帮助到你：）

属性错误：“ NoneType”对象没有属性“ find”

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