{"id":4267,"date":"2024-04-23T19:16:35","date_gmt":"2024-04-23T11:16:35","guid":{"rendered":"https:\/\/www.lcettsg.cn\/code\/?p=4267"},"modified":"2024-05-06T21:45:42","modified_gmt":"2024-05-06T13:45:42","slug":"python%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.lcettsg.cn\/code\/?p=4267","title":{"rendered":"Python\u5b66\u4e60\u7b14\u8bb0"},"content":{"rendered":"\n

https:\/\/www.bilibili.com\/video\/BV1u2421A7LY?p=19&spm_id_from=pageDriver&vd_source=e1e965c6d34ccad0cc6841ecb58eb4a5<\/a><\/p>\n\n\n\n

\u6ce8\u91ca<\/h2>\n\n\n\n

#\u5f00\u59cb\u7684\u5355\u884c\u6ce8\u91ca<\/p>\n\n\n\n

\u201c\u201d\u201c \u591a\u884c\u6ce8\u91ca \u201c\u201d\u201c
”’ \u591a\u884c\u6ce8\u91ca \u2018”<\/p>\n\n\n\n

for\u5faa\u73af<\/h2>\n\n\n\n

for \u53d8\u91cf in \u53ef\u8fed\u4ee3\u5bf9\u8c61 \uff1a
\u4ee3\u7801
\u60f3\u8981\u8ba1\u6570\uff0c\u5fc5\u987b\u501f\u52a9\u4e8erange
range(n): \u4ece0\u6570\u5230n\uff0c\u4f46\u4e0d\u5305\u542bn\u3002
range(m,n): \u4ecem\u6570\u5230n,\u4f46\u4e0d\u5305\u542bn\u3002
range(m,n,s): \u4ecem\u6570\u5230n\uff0c\u4f46\u4e0d\u5305\u542bn\uff0c\u95f4\u9694\u662fs\u3002
\u5e73\u65f6\u7528\u7684\u591a\u7684\u662ffor\u5faa\u73af\uff0cwhile\u5faa\u73af\u7528\u7684\u591a\u7684\u662f\u6b7b\u5faa\u73af\u3002<\/p>\n\n\n\n

\u6570\u636e\u7c7b\u578b<\/h2>\n\n\n\n

int\uff0cfloat\uff0cbool<\/strong><\/h2>\n\n\n\n

int\uff1a\u6574\u6570\uff0c\u52a0\u51cf\u4e58\u9664\uff0c\u5927\u5c0f\u6bd4\u8f83
float\uff1a\u5c0f\u6570\uff0c\u6d6e\u70b9\u6570 print(10\/3) 3.33333333333335. \u8868\u793a\u5c0f\u6570\u662f\u4f1a\u6709\u8bef\u5dee\u7684\u3002
bool\uff1a\u7528\u6765\u505a\u6761\u4ef6\u5224\u65ad\uff0c\u53d6\u503c\u8303\u56f4\u53ea\u6709\u4e24\u4e2atrue,false.
\u57fa\u7840\u6570\u636e\u7c7b\u578b\u4e4b\u95f4\u7684\u8f6c\u5316\uff1a
a=”10″ #\u5b57\u7b26\u4e32
print(type(a))
b=int(a) #\u628a\u5b57\u7b26\u4e32\u8f6c\u5316\u6210int<\/p>\n\n\n\n

a=10 #\u5728python\u4e2d\uff0c\u6240\u6709\u975e\u96f6\u7684\u6570\u5b57\u90fd\u662ftrue\uff0c0\u662ffasle
b=bool(a)
print(type(b))
print(b) #true<\/p>\n\n\n\n

s=”” #\u5728python\u4e2d\uff0c\u6240\u6709\u7684\u975e\u7a7a\u5b57\u7b26\u4e32\u90fd\u662fTrue\uff0c\u7a7a\u5b57\u7b26\u4e32\u662fFalse<\/p>\n\n\n\n

#\u7efc\u4e0a\uff0c\u5728python\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e2d\uff0c\u8868\u793a\u7a7a\u7684\u4e1c\u897f\u90fd\u662fFalse\uff0c\u4e0d\u7a7a\u7684\u4e1c\u897f\u662fTrue
<\/p>\n\n\n\n

str\uff08*****\uff09<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

3.1\u5b57\u7b26\u4e32\u5e38\u89c4\u64cd\u4f5c\uff1a
s.capitalize():\u9996\u5b57\u6bcd\u5927\u5199
s.title()\uff1a\u6bcf\u4e2a\u5355\u8bcd\u9996\u5b57\u6bcd\u5927\u5199
s.lower()\uff1a\u5168\u6539\u4e3a\u5c0f\u5199
s.upper()\uff1a\u5168\u6539\u4e3a\u5927\u5199<\/p>\n\n\n\n

3.2\u66ff\u6362\u4e0e\u5207\u5272\uff1a<\/p>\n\n\n\n

strip(): \u53bb\u9664\u5de6\u53f3\u4e24\u7aef\u7a7a\u767d\u7b26\uff08\u7a7a\u683c\u3001\\t\u3001\\n\uff09\uff0c\u4e2d\u95f4\u4e0d\u5904\u7406\u3002s.strip()
replace(old,new)
split(\u7528\u4ec0\u4e48\u5207\u6362)\uff1a\u5b57\u7b26\u4e32\u5207\u5272
a=”python_java_c_c#_javascript”
lst=a.split(“_”) #\u5207\u5272\u4e4b\u540e\u7684\u7ed3\u679c\u4f1a\u653e\u5728\u5217\u8868\u5f53\u4e2d<\/p>\n\n\n\n

3.3\u67e5\u627e\u548c\u5224\u65ad<\/p>\n\n\n\n

s.find() #\u8fd4\u56de\u6570\u5b57\u4f4d\u7f6e\uff0c-1\u8868\u793a\u6ca1\u6709\u627e\u5230
s.index() #\u5982\u679c\u62a5\u9519\uff0c\u8868\u793a\u6ca1\u6709
print(“\u5468\u6da6\u53d1\u201d in s\uff09 #in \u53ef\u4ee5\u505a\u6761\u4ef6\u4e0a\u7684\u5224\u65ad not in \u5224\u65ad\u4e0d\u5b58\u5728
s.startwith(): #\u5224\u65ad\u662f\u5426\u4ee5\u4ec0\u4e48\u5f00\u5934
s.endwith(): #\u5224\u65ad\u662f\u5426\u4ee5\u4ec0\u4e48\u7ed3\u5c3e
s.isdigit(): #\u5224\u65ad\u662f\u5426\u7531\u6574\u6570\u7ec4\u6210
s.isdecimal()<\/p>\n\n\n\n

\u8865\u5145\uff1a<\/p>\n\n\n\n

len():
join(): #\u8ddfsplit()\u5bf9\u5e94<\/p>\n\n\n\n

list\uff08*****\uff09\u5217\u8868\uff1a<\/h2>\n\n\n\n

\u80fd\u88c5\u4e1c\u897f\u7684\u4e1c\u897f\u3002\u7528[]\u6765\u8868\u793a\u4e00\u4e2a\u5217\u8868\uff0c\u5143\u7d20\u4e4b\u95f4\u7528\u9017\u53f7\u9694\u5f00\u3002
\u7279\u6027\uff1a
1\uff0c\u4e5f\u50cf\u5b57\u7b26\u4e32\u4e00\u6837\u6709\u7d22\u5f15\u548c\u5207\u7247\u3002
2.\u5217\u8868\u7684\u7d22\u5f15\u5982\u679c\u8d85\u8fc7\u8303\u56f4\u4f1a\u62a5\u9519\uff0c\u5b57\u7b26\u4e32\u4e5f\u8fd9\u6837\u3002
3.\u53ef\u4ee5\u7528for \u5faa\u73af\u904d\u5386\uff1a\u4e24\u79cd\u65b9\u5f0f for item in list\uff1b for i in range(len(list)
4.\u7528len()\u51fd\u6570\u62ff\u5230\u5217\u8868\u7684\u957f\u5ea6\u3002
\u589e\u5220\u6539\u67e5\uff1a
list.append():\u6dfb\u52a0\u5143\u7d20\uff0c\u8ffd\u52a0
list.insert(0,”abc”): \u57280\u4e2a\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20\uff0c\u5176\u4f59\u5143\u7d20\u5f80\u540e\u987a\u5ef6\uff0c\u6548\u7387\u4f4e\u3002
list.extend([‘\u6b66\u5219\u5929’,’\u8d62\u653f’,”\u9a6c\u8d85’]) #\u6279\u91cf\u6dfb\u52a0ret = lst.pop(index) #\u5220\u9664\u7b2cindex\u4e2a\u5143\u7d20\uff0c\u8fd4\u56de\u88ab\u5220\u5143\u7d20\u3002
lst.remove(item) #\u5220\u9664item\u5143\u7d20\uff0c\u4e0d\u8fd4\u56de\u503c
lst[4]=newItem; #\u4fee\u6539\u7b2c4\u4e2a\u5143\u7d20\uff0c\u76f4\u63a5\u7528\u7d22\u5f15\u4fee\u6539
lst[index] #\u76f4\u63a5\u7528index\u8fdb\u884c\u67e5\u8be2\u64cd\u4f5c
\u6392\u5e8f\uff1a
\u5217\u8868\u4f1a\u6309\u7167\u5b58\u653e\u7684\u987a\u5e8f\u6765\u4fdd\u5b58\u3002
lst.sort(): \u5bf9\u5217\u8868\u8fdb\u884c\u5347\u5e8f\u6392\u5e8f
lst.sort(reverse=True) #\u964d\u5e8f\u6392\u5e8f
\u5217\u8868\u7684\u5d4c\u5957\uff1a
\u5217\u8868\u7684\u5faa\u73af\u5220\u9664\uff1a\u5c06\u8981\u5220\u9664\u7684\u5185\u5bb9\u4fdd\u5b58\u5728\u4e00\u4e2a\u65b0\u5217\u8868\u4e2d\uff0c\u5faa\u73af\u65b0\u5217\u8868\uff0c\u5220\u9664\u8001\u5217\u8868\u3002<\/p>\n\n\n\n

tuple\uff08**\uff09\u5143\u7ec4\uff1a<\/h2>\n\n\n\n

\u4e0d\u53ef\u53d8\u7684\u5217\u8868\u3002\u56fa\u5b9a\u4e86\u67d0\u4e9b\u6570\u636e\uff0c\u4e0d\u5141\u8bb8\u5916\u754c\u4fee\u6539\u3002
t=(“\u5f20\u65e0\u5fcc”,”\u8d75\u654f”,\u201c\u5475\u5475\u54d2\u201d)
\u5143\u7d20\u5982\u679c\u53ea\u6709\u4e00\u4e2a\u5143\u7ec4\uff0c\u5982t=(“\u54c8\u54c8”)\uff0c\u8fd9\u6837\u4f1a\u88ab\u9ed8\u8ba4\u89e3\u91ca\u4e3a\u4f18\u5148\u7ea7\u8fd0\u7b97\u3002\u53ef\u6539\u4e3at=(“\u54c8\u54c8”,)\u3002\u591a\u52a0\u4e00\u4e2a\u9017\u53f7\u3002
\u5143\u7ec4\u7684\u4e0d\u53ef\u53d8\uff0c\u4f46\u662f\u5176\u5185\u90e8\u5143\u7d20\u53ef\u4ee5\u53d8\u3002\u5982
t=(1,2,3,[\u201c\u5475\u5475\u54d2\u201d\uff0c\u201c\u4e48\u4e48\u54d2\u201d]\uff09\uff0c\u4f46\u662f\u53ef\u4ee5t[3].append(“\u54d2\u54d2\u54d2\u201d\uff09\u3002<\/p>\n\n\n\n

set\uff08*\uff09\u96c6\u5408\uff1a<\/h2>\n\n\n\n

\u5185\u90e8\u662f\u65e0\u5e8f\u7684;\u4e0d\u53ef\u653elist\u3002set\u7c7b\u578b\u7528\u7684\u4e0d\u591a\u3002
\u4e0d\u53ef\u54c8\u5e0c\uff1apython\u4e2d\u7684set\u96c6\u5408\u8fdb\u884c\u6570\u636e\u5b58\u50a8\u65f6\uff0c\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u54c8\u5e0c\u8ba1\u7b97\uff0c\u6839\u636e\u8ba1\u7b97\u51fa\u6765\u7684\u54c8\u5e0c\u503c\u8fdb\u884c\u5b58\u50a8\u6570\u636e\uff0cset\u96c6\u5408\u8981\u6c42\u5b58\u50a8\u7684\u6570\u636e\u5fc5\u987b\u90fd\u662f\u53ef\u4ee5\u8fdb\u884c\u54c8\u5e0c\u8ba1\u7b97\u7684\u3002\u53ef\u54c8\u5e0c\u7684\u6570\u636e\u7c7b\u578b\uff0c\u4e0d\u53ef\u53d8\u7684\u6570\u636e\u7c7b\u578b\uff0cint, str, bool,tuple. \u53ef\u53d8\u7684\u6570\u636e\u7c7b\u578b\u5982list,dict,set\u90fd\u4e0d\u53ef\u54c8\u5e0c\u3002
s={1,2,3}<\/p>\n\n\n\n

set=set() #\u521b\u5efa\u7a7a\u96c6\u5408 <\/p>\n\n\n\n

set.add():#\u6dfb\u52a0\u5143\u7d20
set.pop(): \u4e0d\u80fd\u653e\u7d22\u5f15\uff0c\u7531\u4e8e\u96c6\u5408\u65e0\u5e8f\uff0c\u5220\u9664\u7684\u6bd4\u8f83\u968f\u673a\uff0c
set.remove(value):<\/p>\n\n\n\n

\u60f3\u8981\u4fee\u6539\uff0c\u5219\u5148\u5220\u9664\uff0c\u518d\u65b0\u589e\u3002
\u67e5\u8be2\u5219\u7528for \u5faa\u73af\u3002<\/p>\n\n\n\n

\u4ea4\u96c6\uff1as1 & s2 \u3001 s1.intersection(s2)
\u5e76\u96c6\uff1as2|s2 s1.union(s2)
\u5dee\u96c6: s1-s2 s1.difference(s2)<\/p>\n\n\n\n

\u53bb\u91cd\u64cd\u4f5c\uff1a\u96c6\u5408\u5f53\u4e2d\u4e0d\u80fd\u6709\u91cd\u590d
lst=[‘\u5468\u6770\u4f26’,’\u6606\u51cc’,’\u8521\u4f9d\u6797’,’\u5468\u6770\u4f26’\uff0c’\u6606\u51cc’]
print(list(set(lst))) #\u53bb\u9664\u91cd\u590d\u540e\u662f\u65e0\u5e8f\u7684\u3002<\/p>\n\n\n\n

dict\uff08*****\uff09\u5b57\u5178\uff1a<\/h2>\n\n\n\n

\u5b57\u5178\u662f\u4ee5\u952e\u503c\u5bf9\u7684\u5f62\u5f0f\u5b58\u50a8\u6570\u636e\u7684\u3002\u5b57\u5178\u7684\u8868\u793a\u65b9\u5f0f\uff1a{key:value,key2:value2, key3:value3}
val = dic[“key”]
\u5b57\u5178\u7684key\u5fc5\u987b\u662f\u53ef\u54c8\u5e0c\u7684\u6570\u636e\u7c7b\u578b\uff0cvalue\u53ef\u4ee5\u662f\u4efb\u4f55\u6570\u636e\u7c7b\u578b\u3002<\/p>\n\n\n\n

\u5b57\u5178\u7684\u589e\u5220\u6539\u67e5\uff1a
dic=dict();
dic[‘jay’]=”\u5468\u6770\u4f26”;
dic[1]=123;<\/p>\n\n\n\n

dic.setdefault(“tom”,”\u80e1\u8fa3\u6c64\u201d)\uff1b #\u8bbe\u7f6e\u9ed8\u8ba4\u503c<\/p>\n\n\n\n

dic.pop(key); #\u6839\u636ekey\u5220\u9664
del dic[key]<\/p>\n\n\n\n

\u67e5\u8be2\uff1a dic[key] \u5982\u679ckey\u4e0d\u5b58\u5728\uff0c\u4f1a\u62a5\u9519\u3002 \u6216\u8005 dic.get(key’)\uff0c\u5982\u679ckey\u4e0d\u5b58\u5728\uff0c\u5219\u8fd4\u56deNone\uff0c\u4e0d\u62a5\u9519\u3002
None\uff1a\u7a7a\u3002NoneType\u3002python\u5173\u952e\u5b57\u3002<\/p>\n\n\n\n

\u5b57\u5178\u4e2d\u4e0d\u80fd\u6709\u91cd\u590d\u7684key.<\/p>\n\n\n\n

1.\u53ef\u4ee5\u7528for\u5faa\u73af\uff0c\u76f4\u63a5\u62ff\u5230key.
for key in dic:
2.dic.keys():\u62ff\u5230\u6240\u6709\u7684key.\u8fd4\u56dedict_keys\u7c7b\u578b\u3002\u53ef\u4ee5\u7528list(dist.keys())\u8f6c\u5316\u6210\u5217\u8868\u3002
3.dic.values():
4.\u76f4\u63a5\u62ff\u5230\u5b57\u5178\u4e2d\u7684key\u548cvalue dic.items();
a,b=(1,2) #\u5143\u7d20\u6216\u8005\u5217\u8868\u90fd\u53ef\u4ee5\u6267\u884c\u8be5\u64cd\u4f5c\uff0c\u79f0\u4e3a\u89e3\u6784\uff08\u89e3\u5305\uff09\uff0c\u5de6\u53f3\u4e24\u8fb9\u503c\u7684\u6570\u91cf\u8981\u76f8\u7b49\u3002
for key,value in dic.items()<\/p>\n\n\n\n

bytes\uff08****\uff09:<\/h2>\n\n\n\n

s=\u201c\u5468\u6770\u4f26\u201d
bs1=s.encode(“gbk”)
print(bs1) # b’\\xd6\\xdc\\xdb\\xdc\\xc2\\xd7′ bytes\u7c7b\u578b
bs1=s.encode(“utf-8”)
print(bs1) # b’\\xe5\\x91\\xa8\\xe6\\x9d\\xb0\\x34\\xbc\\xa6′<\/p>\n\n\n\n

\u7a0b\u5e8f\u5458\u5e73\u65f6\u9047\u89c1\u7684\u6240\u6709\u6570\u636e\u6700\u7ec8\u5355\u4f4d\u90fd\u662f\u5b57\u8282byte\u3002<\/p>\n\n\n\n

\u600e\u4e48\u628a\u4e00\u4e2agbk\u7684\u5b57\u8282\u8f6c\u5316\u6210utf-8\u7684\u5b57\u8282
bs= b’\\xd6\\xdc\\xdb\\xdc\\xc2\\xd7′ #\u5b57\u8282\u7801
s=bs.decode(“gbk”) #\u89e3\u7801
bs2=s.encode(“utf-8”) #\u91cd\u65b0\u7f16\u7801<\/p>\n\n\n\n

\u8fd0\u7b97\u7b26\uff08***\uff09<\/p>\n\n\n\n

\u6587\u4ef6\u64cd\u4f5c\uff08****\uff09<\/p>\n\n\n\n

\u51fd\u6570<\/h2>\n\n\n\n

\u51fd\u6570\u7684\u6982\u5ff5<\/h3>\n\n\n\n

\u5bf9\u67d0\u4e00\u7279\u5b9a\u7684\u529f\u80fd\u6216\u8005\u4ee3\u7801\u5757\u8fdb\u884c\u5c01\u88c5\uff0c\u5728\u9700\u8981\u4f7f\u7528\u8be5\u529f\u80fd\u7684\u65f6\u5019\u76f4\u63a5\u8c03\u7528\u5373\u53ef\u3002\u8ba9\u4ee3\u7801\u66f4\u7b80\u4ecb\u3001\u5408\u7406\u3001\u65b9\u4fbf\u3001\u7b80\u5355\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u51fd\u6570\u7684\u53c2\u6570\uff1a
\u5f62\u53c2\uff0c\u4ee5\u51fd\u6570\u5b9a\u4e49\u7684\u65f6\u5019\uff0c\u9700\u8981\u51c6\u5907\u4e00\u4e9b\u53d8\u91cf\u6765\u63a5\u6536\u4fe1\u606f\u3002
1.\u4f4d\u7f6e\u53c2\u6570\uff1a\u6309\u7167\u4f4d\u7f6e\u4e00\u4e2a\u4e2a\u7684\u58f0\u660e\u53d8\u91cf\u3002
2.\u9ed8\u8ba4\u503c\u53c2\u6570\uff1a\u5728\u51fd\u6570\u58f0\u660e\u65f6\u7ed9\u53d8\u91cf\u4e00\u4e2a\u9ed8\u8ba4\u503c\uff0c\u9700\u8981\u653e\u5728\u4f4d\u7f6e\u53c2\u6570\u540e\u9762\u3002
\u5f62\u53c2\uff0c\u5b9e\u9645\u5728\u8c03\u7528\u7684\u65f6\u5019\u4f20\u9012\u7684\u4fe1\u606f\u3002
1.\u4f4d\u7f6e\u53c2\u6570\uff1a\u6309\u65f6\u4f4d\u7f6e\u8fdb\u884c\u4f20\u9012\u53c2\u6570\u3002
2.\u5173\u952e\u5b57\u53c2\u6570\uff0c\u6309\u7167\u53c2\u6570\u7684\u540d\u5b57\u8fdb\u884c\u4f20\u9012\u53c2\u6570\u3002
3.\u6df7\u5408\u53c2\u6570\uff1a\u4f4d\u7f6e\u53c2\u6570\u653e\u524d\u9762\uff0c\u5173\u952e\u5b57\u53c2\u6570\u653e\u540e\u9762\uff0c
4.\u52a8\u6001\u4f20\u53c2\uff1a
eg :*args\uff0c\u8868\u793a\u6240\u6709\u4f4d\u7f6e\u53c2\u6570\u7684\u52a8\u6001\u4f20\u53c2\u3002 *\u63a5\u6536\u5230\u7684\u503c\u4f1a\u88ab\u7edf\u4e00\u653e\u5728\u4e00\u4e2a\u5143\u7ec4\u91cc\u9762\u3002
**kwargs\uff1a\u8868\u793a\u5173\u952e\u5b57\u53c2\u6570\u7684\u52a8\u6001\u4f20\u53c2\uff0c\u63a5\u6536\u5230\u7684\u6240\u6709\u53c2\u6570\u90fd\u4f1a\u88ab\u5904\u7406\u6210\u5b57\u5178\u3002
\u5f62\u53c2\u5728\u6267\u884c\u65f6\uff0c\u5fc5\u987b\u6709\u503c\uff0c\u5426\u5219\u62a5\u9519\u3002\u5b9e\u53c2\u5728\u6267\u884c\u7684\u65f6\u5019\uff0c\u5fc5\u987b\u4fdd\u8bc1\u5f62\u53c2\u6709\u6570\u636e\u3002
\u6df7\u7528\u65f6\u7684\u987a\u5e8f\uff1a\u4f4d\u7f6e\u53c2\u6570>*args>\u9ed8\u8ba4\u503c>**kwargs<\/p>\n\n\n\n

\u5217\u8868\u4f5c\u4e3a\u53c2\u6570\uff1a
stu_list=[‘a’,’b’,’c’,’d’,’e’];
func(*stu_list) <\/p>\n\n\n\n

func(**stu_dict): \u5c06\u5b57\u5178\u6253\u6563\u4e3a\u5173\u952e\u5b57\u53c2\u6570<\/p>\n\n\n\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff1a\u7a0b\u5e8f\u6267\u884c\u5230return,\u51fd\u6570\u5c31\u4f1a\u7acb\u5373\u505c\u6b62\u6267\u884c\u5e76\u8fd4\u56de\u5185\u5bb9\uff0c\u51fd\u6570\u5185return\u540e\u9762\u7684\u8bed\u53e5\u4e0d\u4f1a\u518d\u6267\u884c\u3002
\u5982\u679c\u51fd\u6570\u5185\u6ca1\u6709return ,\u9ed8\u8ba4\u8fd4\u56deNone;
\u5199\u4e86return, \u53ea\u5199\u4e86return,\u540e\u9762\u6ca1\u8ddf\u503c\uff0c\u8fd4\u56deNone\u3002
return \u540e\u9762\u63a5\u4e00\u4e2a\u503c\u3002
return \u540e\u9762\u63a5\u591a\u4e2a\u503c\uff0c\u6b64\u65f6\u51fd\u6570\u8fd4\u56de\u591a\u4e2a\u503c\uff0c\u5916\u754c\u63a5\u6536\u5230\u7684\u662f\u5143\u7ec4\uff0c\u8be5\u5143\u7ec4\u5185\u5b58\u653e\u6240\u6709\u7684\u8fd4\u56de\u503c\u3002<\/p>\n\n\n\n

python\u5185\u7f6e\u51fd\u6570<\/p>\n\n\n\n

\u6807\u51c6\u5e93\uff1a<\/h2>\n\n\n\n

Python\u7684\u6807\u51c6\u5e93\u662f\u5176\u6838\u5fc3\u7684\u6269\u5c55\uff0c\u5305\u62ec\u64cd\u4f5c\u7cfb\u7edf\u63a5\u53e3\u3001\u6587\u4ef6\u64cd\u4f5c\u3001\u8f93\u5165\u8f93\u51fa\u6d41\u3001\u6587\u672c\u5904\u7406\u7b49\u529f\u80fd\u3002<\/p>\n\n\n\n

dir() #\u67e5\u770b\u6a21\u5757\u4e2d\u6240\u5305\u542b\u7684\u5de5\u5177
help() #\u5c55\u793a\u6a21\u5757\u4e2d\u6240\u6709\u65b9\u6cd5\u7684\u8bf4\u660e<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u4f7f\u7528pip\u5b89\u88c5\u6269\u5c55\u5305\uff1a
\u4f7f\u7528pip\u53ef\u4ee5\u5bf9Python\u6269\u5c55\u5305\u8fdb\u884c\u67e5\u627e\u3001\u4e0b\u8f7d\u3001\u5b89\u88c5\u3001\u5378\u8f7d\u7b49\u3002python3.6\u540e\uff0c\u5df2\u662f\u81ea\u5e26\u5b89\u88c5
pip –version #\u67e5\u770bpip\u662f\u5426\u5df2\u7ecf\u5b89\u88c5
pip install -U pip #\u5347\u7ea7pip\u5230\u6700\u65b0\u7248<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

pip uninstall tensorflow #\u7528pip\u5378\u8f7d\u67d0\u4e2a\u6a21\u5757
pip search tensorflow #\u5728pip\u5e93\u4e2d\u641c\u7d22\u67d0\u4e2a\u6a21\u5757
pip list #\u7528pip\u663e\u793a\u5df2\u5b89\u88c5\u7684\u5305
pip install tensorflow -i https:\/\/pypi.tuna.tsinghua.edu.cn\/simple #\u6ce8\u610f\u662f\u4e00\u884c\u4ee3\u7801\uff0c\u5207\u6362\u955c\u50cf\u6e90
pip config set global.index-url https:\/\/pypi.tuna.tsinghua.edu.cn\/simple #\u6ce8\u610f\u8fd9\u662f\u4e00\u884c\u4ee3\u7801\uff0c\u7528pip\u66f4\u65b0\u914d\u7f6e\u6587\u4ef6\uff0c\u4fee\u6539\u9ed8\u8ba4\u6e90<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u5206\u7c7b\u95ee\u9898\uff1a<\/h2>\n\n\n\n

\u4e8c\u5206\u7c7b\uff1a\u8981\u56de\u7b54\u7684\u95ee\u9898\u53ea\u6709\u201c\u662f\u201d\u6216\u201c\u5426\u201d\u3002
\u591a\u5206\u7c7b\uff1a\u5728\u4e8c\u5206\u7c7b\u7684\u57fa\u7840\u4e0a\uff0c\u5c06\u6807\u7b7e\u53ef\u9009\u8303\u56f4\u6269\u5927\u3002
\u591a\u6807\u7b7e\u5206\u7c7b\uff1a\u591a\u6807\u7b7e\u5206\u7c7b\u4e0b\u7684\u4e00\u6761\u6570\u636e\u53ef\u4ee5\u88ab\u6807\u6ce8\u4e0a\u591a\u4e2a\u6807\u7b7e\u3002<\/p>\n\n\n\n

KNN\u7b97\u6cd5\u3001\u51b3\u7b56\u6811\u7b97\u6cd5\u3001\u968f\u673a\u68ee\u6797\u3001SVN\u7b49\uff0c\u90fd\u662f\u4e3a\u89e3\u51b3\u5206\u7c7b\u95ee\u9898\u8bbe\u8ba1\u7684\u3002<\/p>\n\n\n\n

\u805a\u7c7b\u95ee\u9898\uff1a<\/h2>\n\n\n\n

\u805a\u7c7b\u662f\u65e0\u76d1\u7763\u7684\uff0c\u5982\u5728\u4e00\u4e2a\u65c5\u6e38APP\u4e0a\u6709\u4e0a\u5343\u4e07\u7684\u7528\u6237\uff0c \u4f60\u53ef\u80fd\u4f1a\u9700\u8981\u628a\u7528\u6237\u5212\u5206\u6210\u82e5\u5e72\u4e2a\u7ec4\uff0c\u4ee5\u4fbf\u9488\u5bf9\u7279\u5b9a\u7684\u7528\u6237\u7fa4\u4f53\u53bb\u5f00\u53d1\u4e00\u4e9b\u7279\u5b9a\u7684\u529f\u80fd\u3002
\u805a\u7c7b\u662f\u628a\u4e00\u4e2a\u6570\u636e\u96c6\u5212\u5206\u6210\u591a\u4e2a\u7ec4\u7684\u8fc7\u7a0b\uff0c\u4f7f\u5f97\u7ec4\u5185\u7684\u6570\u636e\u5c3d\u91cf\u9ad8\u5ea6\u96c6\u4e2d\uff0c\u548c\u5176\u4ed6\u7ec4\u7684\u6570\u636e\u4e4b\u95f4\u5c3d\u91cf\u8fdc\u79bb\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u56de\u5f52\u95ee\u9898\uff1a<\/h2>\n\n\n\n

\u5206\u7c7b\u65b9\u6cd5\u8f93\u51fa\u7684\u662f\u79bb\u6563\u7684\u6807\u7b7e\u3002\u56de\u5f52\u65b9\u6cd5\u8f93\u51fa\u7684\u7ed3\u679c\u662f\u8fde\u7eed\u503c\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u5173\u8054\u95ee\u9898\uff1a<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u6a21\u578b\u96c6\u6210\uff1a<\/h2>\n\n\n\n

\u6a21\u578b\u96c6\u6210\u4e5f\u53ef\u4ee5\u53eb\u505a\u96c6\u6210\u5b66\u4e60\u3002\u601d\u8def\uff1a\u5408\u5e76\u591a\u4e2a\u6a21\u578b\u6765\u63d0\u5347\u6574\u4f53\u7684\u6548\u679c\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

KNN\u7b97\u6cd5\uff1a\u8fd1\u6731\u8005\u8d64\uff0c\u8fd1\u58a8\u8005\u9ed1<\/h2>\n\n\n\n

\u7b97\u6cd5\u539f\u7406\uff1a\u627e\u5230K\u4e2a\u4e0e\u65b0\u6570\u636e\u6700\u8fd1\u7684\u6837\u672c\uff0c\u53d6\u6837\u672c\u4e2d\u6700\u591a\u7684\u4e00\u4e2a\u7c7b\u522b\u4f5c\u4e3a\u65b0\u6570\u636e\u7684\u7c7b\u522b\u3002
\u6b27\u5f0f\u8ddd\u79bb\uff1a\u4e24\u70b9\u4e4b\u95f4\u7684\u8fde\u7ebf\u3002
\u4f18\u70b9\uff1a\u7b80\u5355\u6613\u5b9e\u73b0; \u5bf9\u4e8e\u8fb9\u754c\u4e0d\u89c4\u5219\u7684\u6570\u636e\u6548\u679c\u8f83\u597d;
\u7f3a\u70b9\uff1a\u53ea\u9002\u5408\u5c0f\u6570\u636e\u96c6; \u6570\u636e\u4e0d\u5e73\u8861\u6548\u679c\u4e0d\u597d\uff1b\u5fc5\u987b\u8981\u505a\u6570\u636e\u6807\u51c6\u5316\uff1b\u4e0d\u9002\u5408\u7279\u5f81\u7ef4\u5ea6\u592a\u591a\u7684\u6570\u636e\u3002<\/p>\n\n\n\n

\u5173\u4e8eK\u503c\u7684\u9009\u62e9\uff1aK\u503c\u7684\u9009\u53d6\u4f1a\u5f71\u54cd\u5230\u6a21\u578b\u7684\u6548\u679c\u3002K\u8d8a\u5c0f\u7684\u65f6\u5019\u5bb9\u6613\u8fc7\u62df\u5408\uff0cK\u8d8a\u5927\u7684\u65f6\u4faf\u5bb9\u6613\u6b20\u62df\u5408\u3002\u5408\u9002\u7684K\u503c\u9700\u8981\u6839\u636e\u7ecf\u9a8c\u548c\u6548\u679c\u53bb\u8fdb\u884c\u5c1d\u8bd5\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u51b3\u7b56\u6811\uff1a<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u5982\u4f55\u9009\u62e9\u4e00\u4e2a\u7279\u5f81\u4f5c\u4e3a\u6839\u8282\u70b9\uff1f\u4e0b\u4e00\u6b21\u51b3\u7b56\u53c8\u8be5\u9009\u53d6\u54ea\u4e2a\u7279\u5f81\u4f5c\u4e3a\u8282\u70b9\uff1f
\u51b3\u7b56\u6811\u7b97\u6cd5\u4f7f\u7528\u4fe1\u606f\u589e\u76ca\u7684\u65b9\u6cd5\u6765\u8861\u91cf\u4e00\u4e2a\u7279\u5f81\u548c\u7279\u5f81\u4e4b\u95f4\u7684\u91cd\u8981\u6027\u3002
\u7406\u60f3\u60c5\u51b5\uff1a\u51b3\u7b56\u6811\u4e0a\u7684\u6bcf\u4e00\u4e2a\u53f6\u5b50\u8282\u70b9\u90fd\u662f\u4e00\u4e2a\u7eaf\u7cb9\u7684\u5206\u7c7b\u3002
\u5b9e\u9645\uff1a\u51b3\u7b56\u6811\u5b9e\u73b0\u7684\u65f6\u5019\u91c7\u7528\u8d2a\u5fc3\u7b97\u6cd5\uff0c\u6765\u5bfb\u627e\u4e00\u4e2a\u6700\u8fd1\u7684\u6700\u4f18\u89e3\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u4f18\u70b9\uff1a
1.\u975e\u5e38\u76f4\u89c2\uff0c\u53ef\u89e3\u91ca\u6027\u6781\u5f3a\u3002
2.\u9884\u6d4b\u901f\u5ea6\u6bd4\u8f83\u5feb\u3002
3.\u65e2\u53ef\u5904\u7406\u79bb\u6563\u503c\u4e5f\u53ef\u4ee5\u5904\u7406\u8fde\u63a5\u503c\u53ca\u7f3a\u5931\u503c\u3002<\/p>\n\n\n\n

\u7f3a\u70b9\uff1a
1.\u5bb9\u6613\u8fc7\u62df\u5408\u3002
2.\u9700\u8981\u5904\u7406\u6837\u672c\u4e0d\u5747\u8861\u7684\u95ee\u9898\u3002
3.\u6837\u672c\u7684\u53d8\u5316\u4f1a\u5f15\u53d1\u6570\u636e\u7ed3\u6784\u7684\u5de8\u53d8\u3002<\/p>\n\n\n\n

\u9884\u526a\u679d\uff1a\u5728\u51b3\u7b56\u6811\u6784\u5efa\u4e4b\u521d\u5c31\u8bbe\u5b9a\u4e00\u4e2a\u9608\u503c\uff0c\u5f53\u5206\u88c2\u8282\u70b9\u7684\u71b5\u9608\u503c\u5c0f\u4e8e\u8bbe\u5b9a\u503c\u7684\u65f6\u5019\u5c31\u4e0d\u518d\u8fdb\u884c\u5206\u88c2\u4e86\u3002
\u540e\u526a\u679d\uff1a\u5728\u51b3\u7b56\u6811\u5df2\u7ecf\u6784\u5efa\u5b8c\u6210\u4ee5\u540e\uff0c\u518d\u6839\u636e\u8bbe\u5b9a\u7684\u6761\u4ef6\u6765\u5224\u65ad\u662f\u5426\u8981\u5408\u5e76\u4e00\u4e9b\u4e2d\u95f4\u8282\u70b9\uff0c\u4f7f\u7528\u53f6\u5b50\u8282\u70b9\u6765\u4ee3\u66ff\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u968f\u673a\u68ee\u6797\uff1a\u4f7f\u7528bagging\u65b9\u6848\u6784\u5efa\u4e86\u591a\u68f5\u51b3\u7b56\u6811\uff0c\u7136\u540e\u5bf9\u6240\u6709\u6811\u7684\u7ed3\u679c\u6765\u8fdb\u884c\u5e73\u5747\u8ba1\u7b97\u4ee5\u83b7\u5f97\u6700\u7ec8\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n

GBDT\uff1aGBDT\u6784\u5efa\u7684\u591a\u68f5\u6811\u4e4b\u95f4\u662f\u6709\u8054\u7cfb\u7684\uff0c\u6bcf\u4e2a\u5206\u7c7b\u5668\u5728\u4e0a\u4e00\u8f6e\u5206\u7c7b\u5668\u7684\u6b8b\u5dee\u57fa\u7840\u4e0a\u8fdb\u884c\u8bad\u7ec3\u3002<\/p>\n\n\n\n

XGBoost\uff1a\u4f18\u5316\u4e86GBDT\u91cc\u9762\u7684\u6c42\u89e3\u8fc7\u7a0b\uff0c\u5e76\u52a0\u5165\u4e86\u5f88\u591a\u5de5\u7a0b\u4e0a\u7684\u4f18\u5316\u9879\u76ee\u3002<\/p>\n\n\n\n

\u6734\u7d20\u8d1d\u53f6\u65af\uff1a<\/h2>\n\n\n\n


<\/p>\n","protected":false},"excerpt":{"rendered":"

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