“`”<\/p>\n
<h4>abs\uff08\uff09<\/h4><\/p>\n
<pre><code>\u8fd4\u56de\u6570\u5b57\u7684\u7edd\u5bf9\u503c
\n<\/code><\/pre><\/p>\n
\u00a0<\/p>\n
<h4>map<\/h4><\/p>\n
<pre><code>\u6839\u636e\u51fd\u6570\u5bf9\u6307\u5b9a\u5e8f\u5217\u505a\u6620\u5c04map()\u51fd\u6570\u63a5\u6536\u4e24\u4e2a\u53c2\u6570\uff0c\u4e00\u4e2a\u662f\u51fd\u6570\uff0c\u4e00\u4e2a\u662f\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff0cmap\u5c06\u4f20\u5165\u7684\u51fd\u6570\u4f9d\u6b21\u4f5c\u7528\u5230\u5e8f\u5217\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u628a\u7ed3\u679c\u4f5c\u4e3a\u65b0\u7684list\u8fd4\u56de\u3002\u8fd4\u56de\u503c\uff1a\u3000\u3000Python2 \u8fd4\u56de\u5217\u8868\u3000\u3000Python3 \u8fd4\u56de\u8fed\u4ee3\u5668\u4f8b\u5b501\uff1a
\ndef mul(x):
\n return x*x
\nn=[1,2,3,4,5]
\nres=list(map(mul,n))
\nprint(res) #[1, 4, 9, 16, 25]\u4f8b\u5b502\uff1aabs() \u8fd4\u56de\u6570\u5b57\u7684\u7edd\u5bf9\u503cret = map(abs,[-1,-5,6,-7])print(list(ret))# [1, 5, 6, 7]
\n<\/code><\/pre><\/p>\n
<h4>filter<\/h4><\/p>\n
<pre><code>filter()\u51fd\u6570\u63a5\u6536\u4e00\u4e2a\u51fd\u6570 f(\u51fd\u6570)\u548c\u4e00\u4e2alist\uff08\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff09\uff0c\u8fd9\u4e2a\u51fd\u6570 f\u7684\u4f5c\u7528\u662f\u5bf9\u6bcf\u4e2a\u5143\u7d20\u8fdb\u884c\u5224\u65ad\uff0c\u8fd4\u56de True\u6216 False\uff0c
\nfilter()\u6839\u636e\u5224\u65ad\u7ed3\u679c\u81ea\u52a8\u8fc7\u6ee4\u6389\u4e0d\u7b26\u5408\u6761\u4ef6\u7684\u5143\u7d20\uff0c\u8fd4\u56de\u7531\u7b26\u5408\u6761\u4ef6\u5143\u7d20\u7ec4\u6210\u7684\u65b0list\u3002
\ndef is_odd(x):
\n return x % 2 == 1<\/p>\n
v=list(filter(is_odd, [1, 4, 6, 7, 9, 12, 17]))
\nprint(v) #[1, 7, 9, 17]
\n<\/code><\/pre><\/p>\n
\u00a0<\/p>\n
<h4><strong>map\u4e0efilter\u603b\u7ed3<\/strong><\/h4><\/p>\n
<pre><code># filter \u4e0e map \u603b\u7ed3
\n# \u53c2\u6570: \u90fd\u662f\u4e00\u4e2a\u51fd\u6570\u540d + \u53ef\u8fed\u4ee3\u5bf9\u8c61
\n# \u8fd4\u56de\u503c: \u90fd\u662f\u8fd4\u56de\u53ef\u8fed\u4ee3\u5bf9\u8c61
\n# \u533a\u522b:
\n# filter \u662f\u505a\u7b5b\u9009\u7684\uff0c\u7ed3\u679c\u8fd8\u662f\u539f\u6765\u5c31\u5728\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e2d\u7684\u9879
\n# map \u662f\u5bf9\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e2d\u6bcf\u4e00\u9879\u505a\u64cd\u4f5c\u7684\uff0c\u7ed3\u679c\u4e0d\u4e00\u5b9a\u662f\u539f\u6765\u5c31\u5728\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e2d\u7684\u9879
\n<\/code><\/pre><\/p>\n
\u00a0<\/p>\n
<h4><strong>isinstance\\type<\/strong><\/h4><\/p>\n
<pre><code>isinstance() \u51fd\u6570\u6765\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u4e00\u4e2a\u5df2\u77e5\u7684\u7c7b\u578b\uff0c\u7c7b\u4f3c type()\u3002
\nisinstance() \u4e0e type() \u533a\u522b\uff1a
\ntype() \u4e0d\u4f1a\u8ba4\u4e3a\u5b50\u7c7b\u662f\u4e00\u79cd\u7236\u7c7b\u7c7b\u578b\uff0c\u4e0d\u8003\u8651\u7ee7\u627f\u5173\u7cfb\u3002
\nisinstance() \u4f1a\u8ba4\u4e3a\u5b50\u7c7b\u662f\u4e00\u79cd\u7236\u7c7b\u7c7b\u578b\uff0c\u8003\u8651\u7ee7\u627f\u5173\u7cfb\u3002
\n\u5982\u679c\u8981\u5224\u65ad\u4e24\u4e2a\u7c7b\u578b\u662f\u5426\u76f8\u540c\u63a8\u8350\u4f7f\u7528 isinstance()\u3002
\n# \u4f8b\u4e00a = 2print(isinstance(a,int)) # Trueprint(isinstance(a,str)) # False<\/p>\n
# type() \u4e0e isinstance() \u533a\u522b
\nclass A:
\n pass<\/p>\n
class B(A):
\n pass<\/p>\n
print(""isinstance"",isinstance(A(),A)) # isinstance True
\nprint(""type"",type(A()) == A) # type True<\/p>\n
print('isinstance',isinstance(B(),A) ) # isinstance True
\nprint('type',type(B()) == A) # type False
\n<\/code><\/pre><\/p>\n
<h4>zip \u62c9\u94fe\u51fd\u6570<\/h4><\/p>\n
<pre><code># zip \u62c9\u94fe\u51fd\u6570\uff0c
\n# \u5c06\u5bf9\u8c61\u4e2d\u5bf9\u5e94\u7684\u5143\u7d20\u6253\u5305\u6210\u4e00\u4e2a\u4e2a\u5143\u7ec4\uff0c
\n# \u7136\u540e\u8fd4\u56de\u7531\u8fd9\u4e9b\u5143\u7ec4\u7ec4\u6210\u7684\u5217\u8868\u8fed\u4ee3\u5668\u3002
\n# \u5982\u679c\u5404\u4e2a\u8fed\u4ee3\u5668\u7684\u5143\u7d20\u4e2a\u6570\u4e0d\u4e00\u81f4\uff0c\u5219\u8fd4\u56de\u5217\u8868\u957f\u5ea6\u4e0e\u6700\u77ed\u7684\u5bf9\u8c61\u76f8\u540c\u3002
\nprint(list(zip([0,1,3],[5,6,7],['a','b'])))
\n# [(0, 5, 'a'), (1, 6, 'b')]
\n<\/code><\/pre><\/p>\n
\u00a0<\/p>\n
\u00a0<\/p>\n
\u00a0<\/p>\n
\u00a0<\/p>\n
<pre><code>zip() \u51fd\u6570\u7528\u4e8e\u5c06\u53ef\u8fed\u4ee3\u7684\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\uff0c\u5c06\u5bf9\u8c61\u4e2d\u5bf9\u5e94\u7684\u5143\u7d20\u6253\u5305\u6210\u4e00\u4e2a\u4e2a\u5143\u7ec4\uff0c\u7136\u540e\u8fd4\u56de\u7531\u8fd9\u4e9b\u5143\u7ec4\u7ec4\u6210\u7684\u5217\u8868\u3002
\n>>>a = [1,2,3]
\n>>> b = [4,5,6]
\n>>> c = [4,5,6,7,8]
\n>>> zipped = zip(a,b) # \u6253\u5305\u4e3a\u5143\u7ec4\u7684\u5217\u8868
\n[(1, 4), (2, 5), (3, 6)]
\n>>> zip(a,c) # \u5143\u7d20\u4e2a\u6570\u4e0e\u6700\u77ed\u7684\u5217\u8868\u4e00\u81f4
\n[(1, 4), (2, 5), (3, 6)]
\n>>> zip(*zipped) # \u4e0e zip \u76f8\u53cd\uff0c\u53ef\u7406\u89e3\u4e3a\u89e3\u538b\uff0c\u8fd4\u56de\u4e8c\u7ef4\u77e9\u9635\u5f0f
\n[(1, 2, 3), (4, 5, 6)]
\n<\/code><\/pre><\/p>\n
\u00a0<\/p>\n
\u00a0<\/p>\n
<strong>reduce<\/strong><\/p>\n
\u00a0<\/p>\n
\u00a0<\/p>\n
<pre><code>'''
\nreduce() \u51fd\u6570
\nreduce() \u51fd\u6570\u4f1a\u5bf9\u53c2\u6570\u5e8f\u5217\u4e2d\u5143\u7d20\u8fdb\u884c\u7d2f\u79ef
\n\u51fd\u6570\u5c06\u4e00\u4e2a\u6570\u636e\u96c6\u5408(\u94fe\u8868\u3001\u5143\u7ec4\u7b49)\u4e2d\u7684\u6240\u6709\u6570\u636e\u8fdb\u884c\u4e0b\u5217\u64cd\u4f5c
\n'''<\/p>\n
\u6ce8\u610f\uff1a
\nPython3\u5df2\u7ecf\u5c06reduce() \u51fd\u6570\u4ece\u5168\u5c40\u540d\u5b57\u7a7a\u95f4\u91cc\u79fb\u9664\u4e86\uff0c\u5b83\u73b0\u5728\u88ab\u653e\u7f6e\u5728 fucntools \u6a21\u5757\u91cc\uff0c\u5982\u679c\u60f3\u8981\u4f7f\u7528\u5b83\uff0c\u5219\u9700\u8981\u901a\u8fc7\u5f15\u5165 functools \u6a21\u5757\u6765\u8c03\u7528 reduce() \u51fd\u6570\uff1a<\/p>\n
from functools import reduce
\ndef add(x,y):
\n return x + y<\/p>\n
print(reduce(add,[1,2,3,4,5]))
\n# 15<\/p>\n
print(reduce(lambda x, y: x+y, [1,2,3,4,5])) # 15<\/p>\n
print(reduce(add,range(1,101)))
\n# 5050
\n<\/code><\/pre><\/p>\n
\u00a0<\/p>\n
\u00a0<\/p>\n
\u00a0<\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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