Reading Note读书杂记
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赋值
>>> list=[] >>> app=[list,list,list] >>> app [[], [], []] >>> app[1].append(1) >>> app [[1], [1], [1]] >>> id(app[1]) 1666670423944 >>> id(app[2]) 1666670423944
条件语句:
>>> app=[1,‘‘,"cat",[]] >>> for i in app: print(app[i])
>>> for i in app: print(i) 1 cat [] >>> for i in app: if i: print(i) 1 cat >>> [i for i in app] [1, ‘‘, ‘cat‘, []] >>> [i for i in app if i] [1, ‘cat‘]
any和all
>>> any(w!=0 for w in app) True >>> all(w!=‘‘ for w in app) False
元组:
>>> t=‘ass‘,33,‘‘ >>> t (‘ass‘, 33, ‘‘)
各种遍历序列的方式
>>> s (2, 5, 3, 1, 6, 7, 95, 3) >>> [n for n in s] [2, 5, 3, 1, 6, 7, 95, 3] >>> [n for n in sorted(s)] [1, 2, 3, 3, 5, 6, 7, 95] >>> [n for n in set(s)] [1, 2, 3, 5, 6, 7, 95] >>> [n for n in reversed(s)] [3, 95, 7, 6, 1, 3, 5, 2] >>> [n for n in s[::-1]] [3, 95, 7, 6, 1, 3, 5, 2] >>> [n for n in set(s).difference(t)] [1, 2, 3, 5, 6, 7, 95] >>> t=[1,23,4,5] >>> [n for n in set(s).difference(t)] [2, 3, 6, 7, 95] >>> [n for n in random.shuffle(s)]
训练集和测试集语料划分:9:1
>>> text=open(r"C:\Users\BNC-PC\Desktop\text.txt","r").read() >>> len(text) 34176 >>> cut=int(0.9*len(text)) >>> training_data,test_data=text[:cut],text[cut:] >>> len(training_data) 30758 >>> len(test_data) 3418 >>> text == training_data + test_data True >>> len(training_data)/len(test_data) 8.998829724985372 >>>
合并
>>> words=‘我 是 中国 人 , 我 爱 祖国‘.split() >>> worelen=[w for w in words] >>> worelen [‘我‘, ‘是‘, ‘中国‘, ‘人‘, ‘,‘, ‘我‘, ‘爱‘, ‘祖国‘] >>> ‘=‘.join(w for w in worelen) ‘我=是=中国=人=,=我=爱=祖国‘
函数:
def bncsum(m,n): sum=0 if n: sum=m/n else: sum=n print(sum) >>> bncsum(4,5) 0.8 >>> bncsum(4,0) 0 >>> help(bncsum) Help on function bncsum in module __main__: bncsum(m, n)
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