问当加载“太大”的数据，或者没有足够的资源( CPU或内存)时，python的行为是什么？

EN

import os
import json
import pickle
from collections import defaultdict

data = [('1599324732926-0',
         {'data': '{"timestamp":1599324732.767, \
                "receipt_timestamp":1599324732.9256856,\
                "delta":true, \
                "bid":{"338.9":0.06482,"338.67":3.95535}, \
                "ask":{"339.12":2.47578,"339.13":6.43172} \
               }'
         }),
        ('1599324732926-1',
         {'data': '{"timestamp":1599324732.767, \
                "receipt_timestamp":1599324732.9256856,\
                "delta":true, \
                "bid":{"338.9":0.06482,"338.67":3.95535}, \
                "ask":{"339.12":2.47578,"339.13":6.43172} \
               }'
         })]

         
def book_flatten(book: dict, timestamp: float, receipt_timestamp: float, delta: str) -> dict:
    """
    Takes book and returns a list of dict, where each element in the list
    is a dictionary with a single row of book data.

    """
    ret = []
    for side in ('bid', 'ask'):
        for price, data in book[side].items():
            ret.append({'side': side, 'price': price, 'size': data, 'timestamp': timestamp, 'receipt_timestamp': receipt_timestamp, 'delta': delta})
    return ret
         
def read(data, dtype='l2_book', pair='AAPL-USD'):       
    key = f'{dtype}-{pair}'
    if len(data) == 0:
        return []
    print("{!s}: Read {!s} messages from Redis".format(key, len(data)))
    ret = []
    ids=dict()
    last_id=defaultdict(list)

    # 1/Start - Lines added for debug
    # Retrieve the last data before the app freezes
    dump_list='./dump_list.data'
    try:
        os.remove(dump_list)
    except OSError:
        pass
    with open(dump_list, 'wb') as filehandle:
        # store the data as binary data stream
        pickle.dump(data, filehandle)
    dump_loop = './dump_loop.txt'
    total_number = len(data)
    counter=1
    # 1/End

    # The mysterious loop aka Bermuda Triangle
    for update_id, update in data:
        #2/Start - Lines added for debug
        try:
            os.remove(dump_loop)
        except OSError:
            pass
        with open(dump_loop, 'w') as filehandle:
            filehandle.write('Starting new loop for item {!s} over {!s}.\n'.format(counter, total_number))
        #2/End
        if dtype in {'l2_book'}:
            update = json.loads(update['data'])
            update = book_flatten(update, update['timestamp'], update['receipt_timestamp'], update['delta'])
            for u in update:
                for k in ('size', 'amount', 'price', 'timestamp', 'receipt_timestamp'):
                    if k in u:
                        u[k] = float(u[k])
            ret.extend(update)
        elif dtype in {'trades'}:
            for k in ('size', 'amount', 'price', 'timestamp', 'receipt_timestamp', 'bid', 'ask'):
                if k in update:
                    update[k] = float(update[k])
            ret.append(update)
        ids[key] = update_id
        #3/Start - Lines added for debug
        with open(dump_loop, 'a') as filehandle:
            filehandle.write('Loop finished.\n')  
        counter+=1
        #3/End

    last_id[key] = ids[key][-1]
    return ids, last_id, ret