python 文件读写 (十二)

缺乏、安全感 2023-10-05 19:00 39阅读 0赞

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70][]

data=""
    #(1) read()
    with open('my.txt','r',encoding='utf-8') as f:
         data=f.read()
    print(type(data))  #<class 'str'>
    print(data)  #读取所有的文件

![20210202154816760.png][]

#(2) read(num)
    with open('my.txt','r',encoding='utf-8') as f:
         data=f.read(5)
    print(type(data),len(data))  #<class 'str'> 5
    print(data)  #读取5个字符 Maybe
    
    #循环读取数据
    with open('my.txt','r',encoding='utf-8') as f:
        #循环读取数据
        while True:
          data=f.read(5)
          print(data)
          time.sleep(.3)
          print('---------')
          if(len(data)==0):
              print('全部读取完毕')
              break

![2021020215494346.png][]

with open('my.txt','r',encoding='utf-8') as f:
        data=f.readline()
    
    print(data)  #Maybe write or read?
    
    with open('my.txt','r',encoding='utf-8') as f:
        while True:
            data=f.readline()
            print(data)
            time.sleep(.2)
            print("*"*10)
            if(len(data)==0):
                print('全部读取完毕')
                break
    # 空格也代表一个字符 换行符  都有长度

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 1][]

#(4) readlines() 列表类型的数据 每一个单个元素, 都是一行的数据
    with open('my.txt','r',encoding='utf-8') as f:
         data=f.readlines()
    print(type(data))  #<class 'str'>
    print(data)  #['Maybe write or read?\n', ' 怎样使用呢！']

![20210202155138502.png][]

#### 总结 空格也是字符,五个空格 五个字符;换行符\\n 也是一个字符 ,表面是可能看不见 ####

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 2][]

data=""
    # (1) write() 把字符串进行写入
    with open('you.txt','w',encoding='utf-8') as f:
    #      f.write('How about are you?')
           f.writelines(['a','b','c'])   #列表[里面的实质数据依旧是字符串]
    
    #读取
    with open('you.txt','r',encoding='utf-8') as f:
         data=f.readlines()
    print(type(data))  #<class 'str'>
    print(data)  #['abc']

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[20210202154816760.png]: https://img-blog.csdnimg.cn/20210202154816760.png
[2021020215494346.png]: https://img-blog.csdnimg.cn/2021020215494346.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20210202155052188.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4,size_16,color_FFFFFF,t_70
[20210202155138502.png]: https://img-blog.csdnimg.cn/20210202155138502.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20210202154644435.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4,size_16,color_FFFFFF,t_70