{"id":1037319,"date":"2024-12-31T12:14:10","date_gmt":"2024-12-31T04:14:10","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1037319.html"},"modified":"2024-12-31T12:14:13","modified_gmt":"2024-12-31T04:14:13","slug":"python%e5%a6%82%e4%bd%95%e7%bb%9f%e8%ae%a1%e5%ad%97%e5%85%b8%e9%87%8c%e9%9d%a2%e5%81%a5%e7%9a%84%e6%95%b0%e9%87%8f","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1037319.html","title":{"rendered":"python\u5982\u4f55\u7edf\u8ba1\u5b57\u5178\u91cc\u9762\u5065\u7684\u6570\u91cf"},"content":{"rendered":"

\"python\u5982\u4f55\u7edf\u8ba1\u5b57\u5178\u91cc\u9762\u5065\u7684\u6570\u91cf\"<\/p>\n

\u4f7f\u7528len()<\/code>\u51fd\u6570\u7edf\u8ba1\u5b57\u5178\u952e\u7684\u6570\u91cf\u3001\u4f7f\u7528keys()<\/code>\u65b9\u6cd5\u83b7\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e\u3001\u4f7f\u7528for<\/code>\u5faa\u73af\u904d\u5386\u5b57\u5178\u7684\u952e<\/strong><\/p>\n<\/p>\n

Python \u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u7edf\u8ba1\u5b57\u5178\u4e2d\u7684\u952e\u7684\u6570\u91cf\u3002\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 len()<\/code> \u51fd\u6570\uff0c\u5b83\u80fd\u591f\u5feb\u901f\u8fd4\u56de\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u4f60\u8fd8\u53ef\u4ee5\u901a\u8fc7 keys()<\/code> \u65b9\u6cd5\u6765\u83b7\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e\uff0c\u5e76\u7ed3\u5408 for<\/code> \u5faa\u73af\u8fdb\u884c\u904d\u5386\u3002\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5e76\u63d0\u4f9b\u76f8\u5e94\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528len()<\/code>\u51fd\u6570\u7edf\u8ba1\u5b57\u5178\u952e\u7684\u6570\u91cf<\/strong><\/h2>\n

Python \u63d0\u4f9b\u4e86\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570 len()<\/code>\uff0c\u5b83\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf\u3002\u8fd9\u662f\u6700\u7b80\u5355\u548c\u76f4\u63a5\u7684\u65b9\u6cd5\u4e4b\u4e00\u3002<\/p>\n<\/p>\n

my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
num_keys = len(my_dict)<\/p>\n
print(f"\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf\u662f: {num_keys}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0clen(my_dict)<\/code> \u5c06\u8fd4\u56de\u5b57\u5178 my_dict<\/code> \u4e2d\u952e\u7684\u6570\u91cf\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528keys()<\/code>\u65b9\u6cd5\u83b7\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e<\/strong><\/h2>\n
keys()<\/code> \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u5b57\u5178\u4e2d\u6240\u6709\u952e\u7684\u89c6\u56fe\u5bf9\u8c61\u3002\u4f60\u53ef\u4ee5\u5c06\u8fd9\u4e2a\u89c6\u56fe\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5217\u8868\uff0c\u4ece\u800c\u8f7b\u677e\u83b7\u53d6\u952e\u7684\u6570\u91cf\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
keys = my_dict.keys()<\/p>\n
num_keys = len(keys)<\/p>\n
print(f"\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf\u662f: {num_keys}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u867d\u7136\u8fd9\u6bb5\u4ee3\u7801\u7a0d\u5fae\u590d\u6742\u4e00\u4e9b\uff0c\u4f46\u5b83\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528 keys()<\/code> \u65b9\u6cd5\u6765\u83b7\u53d6\u5b57\u5178\u7684\u952e\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528for<\/code>\u5faa\u73af\u904d\u5386\u5b57\u5178\u7684\u952e<\/strong><\/h2>\n
\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528 for<\/code> \u5faa\u73af\u6765\u904d\u5386\u5b57\u5178\u7684\u952e\uff0c\u5e76\u5728\u904d\u5386\u8fc7\u7a0b\u4e2d\u8fdb\u884c\u8ba1\u6570\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ef\u80fd\u4e0d\u5982\u524d\u4e24\u79cd\u65b9\u6cd5\u9ad8\u6548\uff0c\u4f46\u5b83\u5c55\u793a\u4e86\u5982\u4f55\u624b\u52a8\u7edf\u8ba1\u952e\u7684\u6570\u91cf\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
count = 0<\/p>\n
for key in my_dict:<\/p>\n
    count += 1<\/p>\n
print(f"\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf\u662f: {count}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u521d\u59cb\u5316\u4e00\u4e2a\u8ba1\u6570\u5668 count<\/code>\uff0c\u5e76\u5728 for<\/code> \u5faa\u73af\u4e2d\u6bcf\u9047\u5230\u4e00\u4e2a\u952e\u65f6\u5c06\u8ba1\u6570\u5668\u52a0\u4e00\u3002<\/p>\n<\/p>\n
\u56db\u3001\u7edf\u8ba1\u5d4c\u5957\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf<\/strong><\/h2>\n
\u5bf9\u4e8e\u5d4c\u5957\u5b57\u5178\uff08\u5b57\u5178\u4e2d\u7684\u503c\u4e5f\u662f\u5b57\u5178\uff09\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u7edf\u8ba1\u6240\u6709\u5d4c\u5957\u5b57\u5178\u4e2d\u7684\u952e\u7684\u603b\u6570\u3002\u53ef\u4ee5\u4f7f\u7528\u9012\u5f52\u51fd\u6570\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n<\/p>\n
def count_keys(d):<\/p>\n
    count = len(d)<\/p>\n
    for value in d.values():<\/p>\n
        if isinstance(value, dict):<\/p>\n
            count += count_keys(value)<\/p>\n
    return count<\/p>\n
nested_dict = {'a': 1, 'b': {'c': 2, 'd': {'e': 3}}}<\/p>\n
total_keys = count_keys(nested_dict)<\/p>\n
print(f"\u5d4c\u5957\u5b57\u5178\u4e2d\u952e\u7684\u603b\u6570\u91cf\u662f: {total_keys}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u9012\u5f52\u51fd\u6570 count_keys<\/code> \u6765\u7edf\u8ba1\u5d4c\u5957\u5b57\u5178\u4e2d\u7684\u952e\u7684\u6570\u91cf\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528 collections.Counter<\/code> \u7edf\u8ba1\u5b57\u5178\u952e\u7684\u51fa\u73b0\u6b21\u6570<\/strong><\/h2>\n
\u6709\u65f6\u5019\uff0c\u4f60\u53ef\u80fd\u4e0d\u4ec5\u4ec5\u9700\u8981\u7edf\u8ba1\u5b57\u5178\u952e\u7684\u6570\u91cf\uff0c\u8fd8\u9700\u8981\u7edf\u8ba1\u6bcf\u4e2a\u952e\u7684\u51fa\u73b0\u6b21\u6570\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 collections.Counter<\/code> \u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n<\/p>\n
from collections import Counter<\/p>\n
list_of_dicts = [{'a': 1, 'b': 2}, {'a': 3, 'c': 4}, {'b': 5, 'd': 6}]<\/p>\n
key_counter = Counter()<\/p>\n
for d in list_of_dicts:<\/p>\n
    key_counter.update(d.keys())<\/p>\n
print(f"\u5b57\u5178\u952e\u7684\u51fa\u73b0\u6b21\u6570: {key_counter}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 Counter<\/code> \u6765\u7edf\u8ba1\u5b57\u5178\u952e\u7684\u51fa\u73b0\u6b21\u6570\u3002<\/p>\n<\/p>\n
\u516d\u3001\u4f7f\u7528 pandas<\/code> \u5e93\u7edf\u8ba1\u5b57\u5178\u952e\u7684\u6570\u91cf<\/strong><\/h2>\n
\u5982\u679c\u4f60\u6b63\u5728\u5904\u7406\u4e00\u4e2a\u5305\u542b\u5b57\u5178\u7684\u6570\u636e\u96c6\uff0c\u5e76\u4e14\u5e0c\u671b\u7edf\u8ba1\u6bcf\u4e2a\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf\uff0cpandas<\/code> \u5e93\u53ef\u4ee5\u63d0\u4f9b\u4fbf\u5229\u3002\u4f60\u53ef\u4ee5\u5c06\u6570\u636e\u96c6\u8f6c\u6362\u4e3a DataFrame<\/code>\uff0c\u5e76\u4f7f\u7528 apply<\/code> \u65b9\u6cd5\u6765\u7edf\u8ba1\u6bcf\u884c\u5b57\u5178\u7684\u952e\u7684\u6570\u91cf\u3002<\/p>\n<\/p>\n
import pandas as pd<\/p>\n
data = [{'a': 1, 'b': 2}, {'a': 3, 'c': 4}, {'b': 5, 'd': 6}]<\/p>\n
df = pd.DataFrame(data)<\/p>\n
df['num_keys'] = df.apply(lambda row: len(row.dropna()), axis=1)<\/p>\n
print(df)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a DataFrame<\/code>\uff0c\u5e76\u4f7f\u7528 apply<\/code> \u65b9\u6cd5\u6765\u7edf\u8ba1\u6bcf\u884c\u5b57\u5178\u7684\u952e\u7684\u6570\u91cf\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u603b\u7ed3\u4e0e\u6700\u4f73\u5b9e\u8df5<\/strong><\/h2>\n
\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u4ecb\u7ecd\u4e86\u591a\u79cd\u7edf\u8ba1\u5b57\u5178\u952e\u6570\u91cf\u7684\u65b9\u6cd5\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570 len()<\/code>\u3001keys()<\/code> \u65b9\u6cd5\u3001for<\/code> \u5faa\u73af\u3001\u9012\u5f52\u51fd\u6570\u3001collections.Counter<\/code> \u4ee5\u53ca pandas<\/code> \u5e93\u3002\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u7684\u573a\u666f\u548c\u4f18\u52bf\u3002\u5bf9\u4e8e\u7b80\u5355\u7684\u5b57\u5178\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 len()<\/code> \u51fd\u6570\uff1b\u5bf9\u4e8e\u5d4c\u5957\u5b57\u5178\uff0c\u53ef\u4ee5\u4f7f\u7528\u9012\u5f52\u51fd\u6570\uff1b\u5bf9\u4e8e\u7edf\u8ba1\u952e\u7684\u51fa\u73b0\u6b21\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528 Counter<\/code>\uff1b\u5bf9\u4e8e\u6570\u636e\u96c6\uff0c\u53ef\u4ee5\u4f7f\u7528 pandas<\/code>\u3002<\/p>\n<\/p>\n
\u603b\u7684\u6765\u8bf4\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53d6\u51b3\u4e8e\u4f60\u7684\u5177\u4f53\u9700\u6c42\u548c\u6570\u636e\u7ed3\u6784\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u591f\u5e2e\u52a9\u4f60\u66f4\u597d\u5730\u7406\u89e3\u548c\u5e94\u7528 Python \u4e2d\u7684\u5b57\u5178\u952e\u7edf\u8ba1\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u5feb\u901f\u7edf\u8ba1\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u5185\u7f6e\u7684len()<\/code>\u51fd\u6570\u6765\u7edf\u8ba1\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u5b57\u5178my_dict<\/code>\uff0c\u53ef\u4ee5\u7528len(my_dict)<\/code>\u6765\u83b7\u53d6\u952e\u7684\u603b\u6570\u3002\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u9ad8\u6548\uff0c\u9002\u7528\u4e8e\u4efb\u4f55\u89c4\u6a21\u7684\u5b57\u5178\u3002<\/p>\n
\u5b57\u5178\u4e2d\u952e\u7684\u6570\u91cf\u4e0e\u503c\u7684\u6570\u91cf\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong>
\u5b57\u5178\u7684\u952e\u6570\u91cf\u6307\u7684\u662f\u5b57\u5178\u4e2d\u72ec\u7acb\u7684\u952e\u7684\u603b\u6570\uff0c\u800c\u503c\u7684\u6570\u91cf\u5219\u662f\u6240\u6709\u952e\u5bf9\u5e94\u7684\u503c\u7684\u6570\u91cf\u3002\u5728Python\u7684\u5b57\u5178\u4e2d\uff0c\u952e\u662f\u552f\u4e00\u7684\uff0c\u6240\u4ee5\u5373\u4f7f\u591a\u4e2a\u952e\u5bf9\u5e94\u540c\u4e00\u4e2a\u503c\uff0c\u952e\u7684\u6570\u91cf\u4e5f\u4e0d\u4f1a\u91cd\u590d\u8ba1\u7b97\u3002\u5982\u679c\u4f60\u60f3\u7edf\u8ba1\u503c\u7684\u6570\u91cf\uff0c\u53ef\u4ee5\u901a\u8fc7len(my_dict.values())<\/code>\u6765\u5b9e\u73b0\u3002<\/p>\n
\u5728\u7edf\u8ba1\u5b57\u5178\u952e\u7684\u6570\u91cf\u65f6\uff0c\u6709\u4ec0\u4e48\u5e38\u89c1\u7684\u9519\u8bef\u9700\u8981\u907f\u514d\uff1f<\/strong>
\u5728\u7edf\u8ba1\u5b57\u5178\u952e\u7684\u6570\u91cf\u65f6\uff0c\u5e38\u89c1\u7684\u9519\u8bef\u5305\u62ec\u8bef\u7528len()<\/code>\u5728\u975e\u5b57\u5178\u5bf9\u8c61\u4e0a\uff0c\u6216\u5bf9\u5b57\u5178\u8fdb\u884c\u8fed\u4ee3\u65f6\u672a\u6b63\u786e\u5904\u7406\u7a7a\u5b57\u5178\u7684\u60c5\u51b5\u3002\u786e\u4fdd\u4f60\u5728\u8c03\u7528len()<\/code>\u65f6\u5bf9\u8c61\u786e\u5b9e\u662f\u5b57\u5178\uff0c\u5e76\u4e14\u5728\u5904\u7406\u7a7a\u5b57\u5178\u65f6\uff0c\u8fd4\u56de\u7684\u6570\u91cf\u5c06\u662f0\uff0c\u8fd9\u662f\u6b63\u5e38\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4f7f\u7528len()\u51fd\u6570\u7edf\u8ba1\u5b57\u5178\u952e\u7684\u6570\u91cf\u3001\u4f7f\u7528keys()\u65b9\u6cd5\u83b7\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e\u3001\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u5b57\u5178\u7684\u952e Pyth […]","protected":false},"author":3,"featured_media":1037333,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1037319"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=1037319"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1037319\/revisions"}],"predecessor-version":[{"id":1037336,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1037319\/revisions\/1037336"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1037333"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1037319"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1037319"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1037319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}