{"id":1033626,"date":"2024-12-31T11:43:28","date_gmt":"2024-12-31T03:43:28","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1033626.html"},"modified":"2024-12-31T11:43:30","modified_gmt":"2024-12-31T03:43:30","slug":"python%e8%be%93%e5%87%ba%e5%a6%82%e4%bd%95%e5%90%88%e5%b9%b6%e5%90%8c%e7%b1%bb%e9%a1%b9","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1033626.html","title":{"rendered":"Python\u8f93\u51fa\u5982\u4f55\u5408\u5e76\u540c\u7c7b\u9879"},"content":{"rendered":"

\"Python\u8f93\u51fa\u5982\u4f55\u5408\u5e76\u540c\u7c7b\u9879\"<\/p>\n

Python\u5408\u5e76\u540c\u7c7b\u9879\u7684\u65b9\u6cd5\u4e3b\u8981\u5305\u62ec\u4f7f\u7528\u5b57\u5178\u3001\u4f7f\u7528\u96c6\u5408\u3001\u4f7f\u7528Counter\u6a21\u5757<\/strong>\u3002\u5728\u5b9e\u8df5\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u65b9\u5f0f\u662f\u901a\u8fc7\u5b57\u5178\u6765\u8fdb\u884c\u5408\u5e76\uff0c\u56e0\u4e3a\u5b57\u5178\u5177\u6709\u9ad8\u6548\u7684\u952e\u503c\u5bf9\u5b58\u50a8\u7279\u6027\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u5bf9\u540c\u7c7b\u9879\u8fdb\u884c\u7edf\u8ba1\u548c\u5408\u5e76\u3002\u4f7f\u7528Counter\u6a21\u5757\u4e5f\u662f\u4e00\u79cd\u7b80\u6d01\u800c\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u5b57\u5178\u5408\u5e76\u540c\u7c7b\u9879<\/h3>\n<\/p>\n

\u5b57\u5178\u662f\u4e00\u79cd\u952e\u503c\u5bf9\u6570\u636e\u7ed3\u6784\uff0c\u5728Python\u4e2d\u975e\u5e38\u9002\u5408\u7528\u4e8e\u7edf\u8ba1\u548c\u5408\u5e76\u540c\u7c7b\u9879\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u904d\u5386\u5217\u8868\u6216\u5176\u4ed6\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff0c\u5c06\u6bcf\u4e2a\u5143\u7d20\u4f5c\u4e3a\u5b57\u5178\u7684\u952e\uff0c\u5e76\u8bb0\u5f55\u5176\u51fa\u73b0\u6b21\u6570\u6216\u8fdb\u884c\u76f8\u5e94\u7684\u5408\u5e76\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u5b57\u5178\u5408\u5e76\u540c\u7c7b\u9879\uff1a<\/p>\n<\/p>\n

def merge_items(items):<\/p>\n
    merged_dict = {}<\/p>\n
    for item in items:<\/p>\n
        if item in merged_dict:<\/p>\n
            merged_dict[item] += 1<\/p>\n
        else:<\/p>\n
            merged_dict[item] = 1<\/p>\n
    return merged_dict<\/p>\n
items = ['apple', 'banana', 'apple', 'orange', 'banana', 'apple']<\/p>\n
merged_items = merge_items(items)<\/p>\n
print(merged_items)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2amerge_items<\/code>\u51fd\u6570\uff0c\u5b83\u63a5\u6536\u4e00\u4e2a\u5217\u8868items<\/code>\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5b57\u5178merged_dict<\/code>\uff0c\u8be5\u5b57\u5178\u8bb0\u5f55\u4e86\u6bcf\u4e2a\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u5408\u5e76\u540c\u7c7b\u9879\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u96c6\u5408\u5408\u5e76\u540c\u7c7b\u9879<\/h3>\n<\/p>\n
\u96c6\u5408\u662f\u4e00\u79cd\u65e0\u5e8f\u4e14\u4e0d\u91cd\u590d\u7684\u5143\u7d20\u96c6\u5408\uff0c\u53ef\u4ee5\u7528\u4e8e\u53bb\u91cd\u64cd\u4f5c\u3002\u867d\u7136\u96c6\u5408\u672c\u8eab\u4e0d\u63d0\u4f9b\u7edf\u8ba1\u529f\u80fd\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u7ed3\u5408\u5b57\u5178\u6216\u5176\u4ed6\u65b9\u5f0f\u6765\u5b9e\u73b0\u5408\u5e76\u540c\u7c7b\u9879\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u96c6\u5408\u548c\u5b57\u5178\u7ed3\u5408\u6765\u5408\u5e76\u540c\u7c7b\u9879\uff1a<\/p>\n<\/p>\n
def merge_items_with_set(items):<\/p>\n
    unique_items = set(items)<\/p>\n
    merged_dict = {item: items.count(item) for item in unique_items}<\/p>\n
    return merged_dict<\/p>\n
items = ['apple', 'banana', 'apple', 'orange', 'banana', 'apple']<\/p>\n
merged_items = merge_items_with_set(items)<\/p>\n
print(merged_items)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u4f7f\u7528set<\/code>\u51fd\u6570\u5c06\u5217\u8868items<\/code>\u4e2d\u7684\u91cd\u590d\u5143\u7d20\u53bb\u9664\uff0c\u5f97\u5230\u4e00\u4e2a\u96c6\u5408unique_items<\/code>\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f\u7edf\u8ba1\u6bcf\u4e2a\u5143\u7d20\u5728\u539f\u5217\u8868\u4e2d\u7684\u51fa\u73b0\u6b21\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5408\u5e76\u540e\u7684\u5b57\u5178merged_dict<\/code>\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528Counter\u6a21\u5757\u5408\u5e76\u540c\u7c7b\u9879<\/h3>\n<\/p>\n
Counter\u6a21\u5757\u662fPython\u6807\u51c6\u5e93collections\u4e2d\u7684\u4e00\u4e2a\u5b50\u7c7b\uff0c\u7528\u4e8e\u8ba1\u6570\u53ef\u54c8\u5e0c\u5bf9\u8c61\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u6d01\u9ad8\u6548\u7684\u65b9\u5f0f\u6765\u7edf\u8ba1\u548c\u5408\u5e76\u540c\u7c7b\u9879\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528Counter\u6a21\u5757\u5408\u5e76\u540c\u7c7b\u9879\uff1a<\/p>\n<\/p>\n
from collections import Counter<\/p>\n
def merge_items_with_counter(items):<\/p>\n
    return Counter(items)<\/p>\n
items = ['apple', 'banana', 'apple', 'orange', 'banana', 'apple']<\/p>\n
merged_items = merge_items_with_counter(items)<\/p>\n
print(merged_items)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528Counter<\/code>\u7c7b\u76f4\u63a5\u5bf9\u5217\u8868items<\/code>\u8fdb\u884c\u8ba1\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2aCounter<\/code>\u5bf9\u8c61merged_items<\/code>\uff0c\u8be5\u5bf9\u8c61\u8bb0\u5f55\u4e86\u6bcf\u4e2a\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\u3002\u4f7f\u7528Counter\u6a21\u5757\u53ef\u4ee5\u6781\u5927\u7b80\u5316\u4ee3\u7801\uff0c\u63d0\u9ad8\u53ef\u8bfb\u6027\u548c\u6548\u7387\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5408\u5e76\u540c\u7c7b\u9879\u7684\u9700\u6c42\u975e\u5e38\u5e7f\u6cdb\u3002\u4f8b\u5982\uff0c\u5728\u6570\u636e\u5206\u6790\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7edf\u8ba1\u67d0\u4e9b\u6570\u636e\u7684\u9891\u6b21\uff1b\u5728\u7535\u5546\u7cfb\u7edf\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7edf\u8ba1\u6bcf\u79cd\u5546\u54c1\u7684\u9500\u552e\u91cf\uff1b\u5728\u65e5\u5fd7\u5206\u6790\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7edf\u8ba1\u6bcf\u79cd\u7c7b\u578b\u7684\u65e5\u5fd7\u51fa\u73b0\u7684\u6b21\u6570\u3002\u4ee5\u4e0b\u662f\u51e0\u4e2a\u5b9e\u9645\u5e94\u7528\u573a\u666f\u7684\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
1\u3001\u6570\u636e\u5206\u6790\u4e2d\u7684\u9891\u6b21\u7edf\u8ba1<\/h4>\n<\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u7ec4\u7528\u6237\u8bbf\u95ee\u8bb0\u5f55\uff0c\u9700\u8981\u7edf\u8ba1\u6bcf\u4e2a\u7528\u6237\u8bbf\u95ee\u7684\u6b21\u6570\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u6216Counter\u6a21\u5757\u6765\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n
from collections import Counter<\/p>\n
def count_user_visits(visits):<\/p>\n
    return Counter(visits)<\/p>\n
visits = ['user1', 'user2', 'user1', 'user3', 'user2', 'user1']<\/p>\n
user_visits = count_user_visits(visits)<\/p>\n
print(user_visits)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u7535\u5546\u7cfb\u7edf\u4e2d\u7684\u5546\u54c1\u9500\u552e\u91cf\u7edf\u8ba1<\/h4>\n<\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u7ec4\u5546\u54c1\u9500\u552e\u8bb0\u5f55\uff0c\u9700\u8981\u7edf\u8ba1\u6bcf\u79cd\u5546\u54c1\u7684\u9500\u552e\u91cf\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u6216Counter\u6a21\u5757\u6765\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n
from collections import Counter<\/p>\n
def count_product_sales(sales):<\/p>\n
    return Counter(sales)<\/p>\n
sales = ['product1', 'product2', 'product1', 'product3', 'product2', 'product1']<\/p>\n
product_sales = count_product_sales(sales)<\/p>\n
print(product_sales)<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u65e5\u5fd7\u5206\u6790\u4e2d\u7684\u65e5\u5fd7\u7c7b\u578b\u7edf\u8ba1<\/h4>\n<\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u7ec4\u65e5\u5fd7\u8bb0\u5f55\uff0c\u9700\u8981\u7edf\u8ba1\u6bcf\u79cd\u7c7b\u578b\u7684\u65e5\u5fd7\u51fa\u73b0\u7684\u6b21\u6570\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u6216Counter\u6a21\u5757\u6765\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n
from collections import Counter<\/p>\n
def count_log_types(logs):<\/p>\n
    return Counter(logs)<\/p>\n
logs = ['INFO', 'ERROR', 'INFO', 'DEBUG', 'ERROR', 'INFO']<\/p>\n
log_types = count_log_types(logs)<\/p>\n
print(log_types)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u4f18\u5316\u4e0e\u6269\u5c55<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5904\u7406\u66f4\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784\uff0c\u4f8b\u5982\u5305\u542b\u591a\u4e2a\u5b57\u6bb5\u7684\u5b57\u5178\u6216\u5d4c\u5957\u5217\u8868\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u6269\u5c55\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u7ed3\u5408\u5176\u4ed6Python\u6280\u5de7\u6765\u5b9e\u73b0\u5408\u5e76\u540c\u7c7b\u9879\u3002<\/p>\n<\/p>\n
1\u3001\u5904\u7406\u5305\u542b\u591a\u4e2a\u5b57\u6bb5\u7684\u5b57\u5178<\/h4>\n<\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u7ec4\u5305\u542b\u591a\u4e2a\u5b57\u6bb5\u7684\u5b57\u5178\uff0c\u9700\u8981\u6839\u636e\u67d0\u4e2a\u5b57\u6bb5\u5408\u5e76\u540c\u7c7b\u9879\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u7ed3\u5408\u5d4c\u5957\u5faa\u73af\u6765\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n
def merge_dicts_by_field(dicts, field):<\/p>\n
    merged_dict = {}<\/p>\n
    for d in dicts:<\/p>\n
        key = d[field]<\/p>\n
        if key in merged_dict:<\/p>\n
            for k, v in d.items():<\/p>\n
                if k != field:<\/p>\n
                    merged_dict[key][k] += v<\/p>\n
        else:<\/p>\n
            merged_dict[key] = d.copy()<\/p>\n
            merged_dict[key].pop(field)<\/p>\n
    return merged_dict<\/p>\n
dicts = [<\/p>\n
    {'category': 'fruit', 'count': 10, 'price': 5},<\/p>\n
    {'category': 'fruit', 'count': 15, 'price': 7},<\/p>\n
    {'category': 'vegetable', 'count': 20, 'price': 3}<\/p>\n
]<\/p>\n
merged_dicts = merge_dicts_by_field(dicts, 'category')<\/p>\n
print(merged_dicts)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2amerge_dicts_by_field<\/code>\u51fd\u6570\uff0c\u5b83\u63a5\u6536\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u5b57\u6bb5\u7684\u5b57\u5178\u5217\u8868dicts<\/code>\u548c\u4e00\u4e2a\u5b57\u6bb5\u540dfield<\/code>\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5408\u5e76\u540e\u7684\u5b57\u5178merged_dict<\/code>\u3002\u8be5\u5b57\u5178\u6839\u636e\u6307\u5b9a\u5b57\u6bb5\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u5e76\u5bf9\u5176\u4ed6\u5b57\u6bb5\u7684\u503c\u8fdb\u884c\u7d2f\u52a0\u3002<\/p>\n<\/p>\n
2\u3001\u5904\u7406\u5d4c\u5957\u5217\u8868<\/h4>\n<\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5d4c\u5957\u5217\u8868\uff0c\u9700\u8981\u6839\u636e\u67d0\u4e2a\u5143\u7d20\u5408\u5e76\u540c\u7c7b\u9879\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u7ed3\u5408\u5217\u8868\u63a8\u5bfc\u5f0f\u6765\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n
def merge_nested_lists(lists, index):<\/p>\n
    merged_dict = {}<\/p>\n
    for lst in lists:<\/p>\n
        key = lst[index]<\/p>\n
        if key in merged_dict:<\/p>\n
            merged_dict[key] = [x + y for x, y in zip(merged_dict[key], lst)]<\/p>\n
        else:<\/p>\n
            merged_dict[key] = lst<\/p>\n
    return merged_dict<\/p>\n
lists = [<\/p>\n
    ['fruit', 10, 5],<\/p>\n
    ['fruit', 15, 7],<\/p>\n
    ['vegetable', 20, 3]<\/p>\n
]<\/p>\n
merged_lists = merge_nested_lists(lists, 0)<\/p>\n
print(merged_lists)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2amerge_nested_lists<\/code>\u51fd\u6570\uff0c\u5b83\u63a5\u6536\u4e00\u4e2a\u5d4c\u5957\u5217\u8868lists<\/code>\u548c\u4e00\u4e2a\u7d22\u5f15index<\/code>\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5408\u5e76\u540e\u7684\u5b57\u5178merged_dict<\/code>\u3002\u8be5\u5b57\u5178\u6839\u636e\u6307\u5b9a\u7d22\u5f15\u7684\u5143\u7d20\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u5e76\u5bf9\u5176\u4ed6\u5143\u7d20\u7684\u503c\u8fdb\u884c\u7d2f\u52a0\u3002<\/p>\n<\/p>\n
\u516d\u3001\u6027\u80fd\u548c\u4f18\u5316<\/h3>\n<\/p>\n
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