自学教程：python代码实现备忘录案例讲解

def read_all(txt):   ...:     with open(txt,'r') as f:   ...:         return f.read()   ...:     read_all('test.txt')Out[23]: 'a,b,c,d/ne,f,g,h/ni,j,k,l/n'

def read_line(txt):   ...:     line_list = []   ...:     with open(txt,'r') as f:   ...:         for line in f.readlines():   ...:             line_list.append(line)   ...:     return line_list   ...: read_line('test.txt')Out[27]: ['a,b,c,d/n', 'e,f,g,h/n', 'i,j,k,l/n']

str = 'aaaabbbbcc'with open('test.txt','w') as f:   ...:     f.write(str)   ...: with open('test.txt','r') as f:   ...:     print(f.read())   ...: aaaabbbbcc

data = ['a','b','c']   ...: with open("data.txt","w") as f:   ...:     f.writelines(data)   ...: with open('data.txt','r') as f:   ...:     print(f.read())   ...: abc

data = ['a','b','c']with open('data.txt','w')as f:   ...:     for i in data:   ...:         i = str(i)+'/n'   ...:         f.write(i)with open('data.txt','r') as f:   ...:     print(f.read())   ...: abc

import csvwith open('test.csv', 'r') as f:    data = csv.reader(f)    print(next(data))['filename', 'label']

import csvwith open('data.csv', 'w')as file:    dtwt = csv.writer(file)    dtwt.writerow(['世', '间', '美', '好', '与', '你', '环环', '相', '扣'])import csvwith open('data.csv', 'r') as f:    data = csv.reader(f)    print(next(data))

random.random()Out[3]: 0.990545986753395

random.randint(1,10)Out[4]: 3

random.uniform(2.3,5)Out[5]: 4.370526664286709

alist = ['a',1,2]random.choice(alist)Out[7]: 2

blist= [1,2,3,4,5]random.sample(blist,4)Out[11]: [4, 5, 2, 3]blistOut[12]: [1, 2, 3, 4, 5]

clist = ['a','b','c','d']random.shuffle(clist)clistOut[15]: ['d', 'a', 'c', 'b']

random.seed(20)random.randint(1,10)Out[17]: 3random.randint(1,10)Out[18]: 5random.seed(20)random.randint(1,10)Out[20]: 3