<\/span><\/h2>\n\n\n\n\u5408\u5e76\u5d4c\u5957\u5b57\u5178\uff1f\u6807\u51c6\u5e93\u6ca1\u8fd9\u529f\u80fd\uff1f\u4e0d\u6015\uff0c\u54b1\u624b\u5199\u4e00\u4e2a\uff01<\/p>\n\n\n\n
def deepmerge(dict1, dict2):
for key in dict2:
if key in dict1 and isinstance(dict1[key], dict) and isinstance(dict2[key], dict):
deepmerge(dict1[key], dict2[key])
else:
dict1[key] = dict2[key]
return dict1<\/code><\/pre>\n\n\n\n\u8fd9\u6bb5\u4ee3\u7801\u8d70\u7684\u662f\u9012\u5f52\u8def\u7ebf\uff0c\u5c42\u5c42\u6df1\u5165\uff0c\u76f4\u5230\u6700\u5e95\u5c42\uff0c\u786e\u4fdd\u5408\u5e76\u65e0\u9057\u6f0f\u3002<\/p>\n\n\n\n
<\/span>4. \u9b54\u6cd5\u952e\u503c\u5bf9\u4ea4\u6362\uff1azip<\/code>\u4e0edict<\/code>\u8054\u8882\u51fa\u6f14<\/strong><\/span><\/h2>\n\n\n\nkeys = ['a', 'b', 'c']
values = [1, 2, 3]
swapped = dict(zip(values, keys)) # \u503c\u53d8\u952e\uff0c\u952e\u53d8\u503c\uff0c\u4e7e\u5764\u5927\u632a\u79fb<\/em><\/code><\/pre>\n\n\n\nzip<\/code>\u51fd\u6570\u548cdict<\/code>\u6784\u9020\u5668\u4e00\u7ed3\u5408\uff0c\u77ac\u95f4\u5b8c\u6210\u952e\u503c\u5bf9\u7684\u4e92\u6362\uff0c\u662f\u4e0d\u662f\u5f88\u795e\u5947\uff1f<\/p>\n\n\n\n<\/span>5. \u795e\u79d8\u7684get<\/code>\uff1a\u5b89\u5168\u53d6\u503c\u6cd5<\/strong><\/span><\/h2>\n\n\n\nmy_dict = {'a': 1}
print(my_dict.get('b', '\u4e0d\u5b58\u5728\u7684\u952e')) # \u8f93\u51fa: '\u4e0d\u5b58\u5728\u7684\u952e'<\/em><\/code><\/pre>\n\n\n\n\u7528get<\/code>\u65b9\u6cd5\u53d6\u503c\uff0c\u5373\u4f7f\u952e\u4e0d\u5b58\u5728\u4e5f\u4e0d\u4f1a\u629b\u5f02\u5e38\uff0c\u8fd8\u53ef\u4ee5\u6307\u5b9a\u9ed8\u8ba4\u503c\uff0c\u5b89\u5168\u53c8\u4f53\u8d34\u3002<\/p>\n\n\n\n<\/span>6. update<\/code>\u7684\u5965\u4e49\uff1a\u4f18\u96c5\u7684\u66f4\u65b0<\/strong><\/span><\/h2>\n\n\n\nmy_dict.update({'d': 4}) # \u9759\u6084\u6084\u5730\u6dfb\u52a0\u6216\u66f4\u65b0\u952e\u503c<\/em><\/code><\/pre>\n\n\n\nupdate<\/code>\u65b9\u6cd5\uff0c\u4e0d\u58f0\u4e0d\u54cd\u5730\u66f4\u65b0\u5b57\u5178\uff0c\u8fd8\u80fd\u5904\u7406\u5d4c\u5957\u7ed3\u6784\uff0c\u662f\u4e2a\u4f4e\u8c03\u7684\u5b9e\u529b\u6d3e\u3002<\/p>\n\n\n\n<\/span>7. \u952e\u7684\u904d\u5386\u5c0f\u5f84\uff1akeys()<\/code><\/strong><\/span><\/h2>\n\n\n\nfor key in my_dict.keys():
print(key, \"=>\", my_dict[key]) # \u4e00\u6b65\u4e00\u5370\uff0c\u904d\u5386\u6240\u6709\u952e<\/em><\/code><\/pre>\n\n\n\n\u904d\u5386\u5b57\u5178\u7684\u952e\uff0c\u5c31\u50cf\u5728\u68ee\u6797\u4e2d\u6f2b\u6b65\uff0c\u6e05\u6670\u800c\u6709\u5e8f\u3002<\/p>\n\n\n\n
<\/span>8. \u503c\u7684\u63a2\u7d22\u4e4b\u65c5\uff1avalues()<\/code>\u4e0eitems()<\/code><\/strong><\/span><\/h2>\n\n\n\nfor value in my_dict.values():
print(value) # \u53ea\u770b\u679c\u5b9e\uff0c\u4e0d\u95ee\u51fa\u5904<\/em>
for key, value in my_dict.items():
print(f\"{key}: {value}\") # \u952e\u503c\u6210\u5bf9\uff0c\u53cc\u5bbf\u53cc\u98de<\/em><\/code><\/pre>\n\n\n\nvalues()<\/code>\u904d\u5386\u6240\u6709\u503c\uff0citems()<\/code>\u5219\u662f\u952e\u503c\u5bf9\u7684\u5b8c\u7f8e\u7ec4\u5408\uff0c\u8ba9\u4f60\u7684\u5faa\u73af\u66f4\u52a0\u7075\u6d3b\u3002<\/p>\n\n\n\n<\/span>9. \u9ad8\u7ea7\u7b5b\u9009\uff1a\u5217\u8868\u63a8\u5bfc+\u5b57\u5178<\/strong><\/span><\/h2>\n\n\n\nfiltered = {k: v for k, v in my_dict.items() if v > 1} # \u53ea\u4fdd\u7559\u5927\u4e8e1\u7684\u503c<\/em><\/code><\/pre>\n\n\n\n\u7ed3\u5408\u5217\u8868\u63a8\u5bfc\uff0c\u8f7b\u677e\u8fc7\u6ee4\u51fa\u6ee1\u8db3\u6761\u4ef6\u7684\u952e\u503c\u5bf9\uff0c\u7b80\u6d01\u9ad8\u6548\u3002<\/p>\n\n\n\n
<\/span>10. \u5b57\u5178\u8f6c\u5217\u8868\uff1a\u9006\u5411\u64cd\u4f5c<\/strong><\/span><\/h2>\n\n\n\nas_list = list(my_dict.items()) # \u5b57\u5178\u77ac\u95f4\u53d8\u5217\u8868\uff0c\u952e\u503c\u5bf9\u6253\u5305\u5e26\u8d70<\/em><\/code><\/pre>\n\n\n\n\u5f53\u4f60\u9700\u8981\u5c06\u5b57\u5178\u8f6c\u6362\u4e3a\u5217\u8868\u65f6\uff0c\u8fd9\u62db\u975e\u5e38\u5b9e\u7528\uff0c\u5c24\u5176\u662f\u9700\u8981\u6392\u5e8f\u6216\u8fdb\u4e00\u6b65\u5904\u7406\u65f6\u3002<\/p>\n\n\n\n
<\/span>11. \u53cd\u8f6c\u5b57\u5178\uff1a\u89d2\u8272\u4e92\u6362<\/strong><\/span><\/h2>\n\n\n\nreversed_dict = {v: k for k, v in my_dict.items()} # \u952e\u53d8\u503c\uff0c\u503c\u53d8\u952e\uff0c\u53cd\u8f6c\u4e16\u754c<\/em><\/code><\/pre>\n\n\n\n\u5c0f\u5fc3\u4f7f\u7528\uff0c\u8fd9\u62db\u53ef\u4ee5\u77ac\u95f4\u6539\u53d8\u5b57\u5178\u7684\u9762\u8c8c\uff0c\u4f46\u8981\u6ce8\u610f\u503c\u7684\u552f\u4e00\u6027\u54e6\uff01<\/p>\n\n\n\n
<\/span>12. \u5feb\u901f\u8ba1\u6570\uff1a\u5b57\u5178\u7684\u7edf\u8ba1\u529b\u91cf<\/strong><\/span><\/h2>\n\n\n\ncounts = {}
for item in ['apple', 'banana', 'apple']:
counts[item] = counts.get(item, 0) + 1 # \u7edf\u8ba1\u51fa\u73b0\u6b21\u6570\uff0c\u7b80\u5355\u7c97\u66b4\u6709\u6548<\/em><\/code><\/pre>\n\n\n\n\u7edf\u8ba1\u5143\u7d20\u51fa\u73b0\u6b21\u6570\u7684\u7ecf\u5178\u7528\u6cd5\uff0c\u9002\u7528\u4e8e\u5feb\u901f\u8ba1\u6570\u573a\u666f\u3002<\/p>\n\n\n\n
<\/span>13. \u5b57\u5178\u7684\u5220\u9664\u827a\u672f\uff1adel<\/code>\u4e0epop<\/code><\/strong><\/span><\/h2>\n\n\n\ndel my_dict['a'] # \u76f4\u63a5\u5220\u9664\u952e\u4e3a'a'\u7684\u9879<\/em>
key_to_remove = 'b'
removed_value = my_dict.pop(key_to_remove, '\u9ed8\u8ba4\u503c') # \u5220\u9664\u5e76\u8fd4\u56de\u503c\uff0c\u5b89\u5168\u7b2c\u4e00<\/em><\/code><\/pre>\n\n\n\ndel<\/code>\u662f\u7c97\u72b7\u7684\u5220\u9664\uff0cpop<\/code>\u5219\u66f4\u7ec6\u817b\uff0c\u8fd8\u80fd\u5904\u7406\u4e0d\u5b58\u5728\u7684\u952e\u3002<\/p>\n\n\n\n<\/span>14. \u904d\u5386\u7684\u9ad8\u7ea7\u5f62\u6001\uff1aenumerate<\/code>\u4e0e\u5b57\u5178<\/strong><\/span><\/h2>\n\n\n\n# \u5047\u8bbe\u6211\u4eec\u6709\u5217\u8868\u548c\u5b57\u5178\u7684\u5173\u8054<\/em>
for index, key in enumerate(sorted(my_dict)):
print(f\"\u7b2c{index+1}\u4e2a\u952e\u662f\uff1a{key}\")<\/code><\/pre>\n\n\n\n\u7ed3\u5408enumerate<\/code>\u904d\u5386\u6392\u5e8f\u540e\u7684\u952e\uff0c\u975e\u5e38\u9002\u5408\u6309\u5e8f\u5904\u7406\u5b57\u5178\u3002<\/p>\n\n\n\n<\/span>15. \u952e\u7684\u552f\u4e00\u6027\u68c0\u9a8c\uff1aset<\/code>\u7684\u5e2e\u5fd9<\/strong><\/span><\/h2>\n\n\n\nkeys_set = set(my_dict.keys()) # \u8f6c\u6362\u6210\u96c6\u5408\uff0c\u68c0\u67e5\u952e\u7684\u552f\u4e00\u6027<\/em><\/code><\/pre>\n\n\n\n\u5229\u7528\u96c6\u5408\u7684\u7279\u6027\uff0c\u5feb\u901f\u5224\u65ad\u952e\u662f\u5426\u91cd\u590d\uff0c\u6216\u8005\u8fdb\u884c\u96c6\u5408\u8fd0\u7b97\u3002<\/p>\n\n\n\n
<\/span>16. \u9ed8\u8ba4\u5de5\u5382\uff1adefaultdict<\/code><\/strong><\/span><\/h2>\n\n\n\nfrom collections import defaultdict
dd = defaultdict(int) # \u7f3a\u7701\u503c\u4e3a0\uff0c\u4e0d\u518d\u62c5\u5fc3KeyError<\/em>
dd['new_key'] += 1 # \u81ea\u52a8\u521d\u59cb\u5316\u4e3a0\uff0c\u7136\u540e\u52a01<\/em><\/code><\/pre>\n\n\n\ndefaultdict<\/code>\uff0c\u81ea\u52a8\u521d\u59cb\u5316\u6307\u5b9a\u7c7b\u578b\u7684\u9ed8\u8ba4\u503c\uff0c\u907f\u514d\u4e86\u9891\u7e41\u7684if<\/code>\u68c0\u67e5\u3002<\/p>\n\n\n\n<\/span>17. \u6df1\u62f7\u8d1d\u4e0e\u6d45\u62f7\u8d1d\uff1a\u8c01\u662f\u8c01\u7684\u5f71\u5b50\uff1f<\/strong><\/span><\/h2>\n\n\n\nimport copy
shallow_copy = copy.copy(my_dict)
deep_copy = copy.deepcopy(my_dict)
# \u6d45\u62f7\u8d1d\u590d\u5236\u9876\u5c42\uff0c\u6df1\u62f7\u8d1d\u8fde\u6df1\u5c42\u7ed3\u6784\u4e00\u8d77\u590d\u5236<\/em><\/code><\/pre>\n\n\n\n\u4e86\u89e3\u62f7\u8d1d\u7684\u5dee\u5f02\uff0c\u5bf9\u4e8e\u5904\u7406\u5d4c\u5957\u5b57\u5178\u81f3\u5173\u91cd\u8981\u3002<\/p>\n\n\n\n
<\/span>18. \u5b57\u5178\u7684\u6392\u5e8f\uff1asorted<\/code>\u7684\u9b54\u6cd5<\/strong><\/span><\/h2>\n\n\n\nsorted_items = sorted(my_dict.items(), key=lambda x: x[1]) # \u6309\u503c\u6392\u5e8f<\/em><\/code><\/pre>\n\n\n\n\u901a\u8fc7sorted<\/code>\u51fd\u6570\uff0c\u4f60\u53ef\u4ee5\u6309\u7167\u952e\u6216\u503c\u5bf9\u5b57\u5178\u8fdb\u884c\u6392\u5e8f\uff0c\u975e\u5e38\u7075\u6d3b\u3002<\/p>\n\n\n\n<\/span>19. \u6e05\u7a7a\u5b57\u5178\uff1a\u91cd\u7f6e\u4e4b\u65c5<\/strong><\/span><\/h2>\n\n\n\nmy_dict.clear() # \u4e00\u952e\u6e05\u7a7a\uff0c\u56de\u5f52\u521d\u5fc3<\/em><\/code><\/pre>\n\n\n\n\u6709\u65f6\u5019\uff0c\u653e\u4e0b\u4e00\u5207\uff0c\u91cd\u65b0\u5f00\u59cb\uff0c\u4e5f\u662f\u4e00\u79cd\u89e3\u8131\u3002<\/p>\n\n\n\n
<\/span>20. \u5b57\u5178\u8868\u8fbe\u5f0f\u7684\u5947\u6280\uff1a\u4e00\u884c\u4ee3\u7801\u7684\u827a\u672f<\/strong><\/span><\/h2>\n\n\n\nages = {'Alice': 30, 'Bob': 24}
age_sum = sum(age for name, age in ages.items() if name.startswith('A')) # \u53ea\u8ba1\u7b97\u540d\u5b57\u4ee5'A'\u5f00\u5934\u7684\u4eba\u7684\u5e74\u9f84\u603b\u548c<\/em><\/code><\/pre>\n\n\n\n\u4e00\u884c\u4ee3\u7801\u89e3\u51b3\u6218\u6597\uff0c\u5c55\u73b0\u4e86Python\u7684\u4f18\u96c5\u4e0e\u5f3a\u5927\u3002<\/p>\n\n\n\n
\n\n\n\n<\/span>\u8fdb\u9636\u6280\u5de7<\/strong><\/span><\/h2>\n\n\n\n