#loop until user terminates input while True: entry = input('> ') if entry == '.': break else: all.append(entry) #write lines to file with proper line-ending fobj = open(fname, 'w') fobj.writelines(['%s%s' %(x,ls) for x in all]) fobj.close() print ('Done') 程序验证: ...
f = open('/tmp/workfile', 'r+') f.write('0123456789abcdef') f.seek(5) # Go to the 6th byte in the file f.read(1) '5' f.seek (-3, 2) # Go to the 3rd byte before the end f.read(1) 'd' 五、关闭文件释放资源文件操作完毕,一定要记得关闭文件f.close(),可以释放资源供其他...
withopen('file.txt','r')asfile:lines=file.readlines()# lines 现在是一个包含每一行文本的列表print(lines)# 输出:# ['Hello, this is line 1.\n', 'This is line 2.\n', 'And this is line 3.\n']# 访问特定行print(lines[0].strip())# 输出:Hello, this is line 1. 注意事项: 每...
/1'] >>> interfaces.append('Gi1/2') >>> print interfaces ['/1', 'Gi1/2'] 首先我们建立一个空列表,并把它赋值给interfaces变量,然后使用append()方法将端口'Gi1/1'加入至该列表,随后再次调用append()将'Gi1/2'加入至该列表,现在列表interfaces里有两个元素了。 len() 列表的len()方法和...
('usb') >= 0: usb_dirs.append(elem.text) else: if elem.text.lower().startswith('flash'): master_dir = elem.text else: slave_dir_list.append(elem.text) usb_dirs.sort(reverse=True) return master_dir, slave_dir_list, usb_dirs @ops_conn_operation def file_exist_on_master(file_...
print line a.close( ) 例3、追加 f = file('test1.txt','a') f = write('append to the end') f.close( ) 例4、文件内容替换 for line in fileinput.input('test1.txt',inplace=1,backup='.bak'): #表示把匹配的内容写到文件中,并先备份原文件 ...
# Write String to Text File in Text Mode text_file = open("D:/work/20190810/sample.txt", "wt") n = text_file.write('Python, Python~') text_file.close() print(n)执行和输出: 再次打开该文件查看其内容:3. 移除文件在Python 里移除一个文件可以调用 os 库的remove() 方法,将该文件的路径...
1. Steps for Appending to a JSON File In Python, appending JSON to a file consists of the following steps: Read the JSON in Pythondictorlistobject. Append the JSON todict(orlist) object by modifying it. Write the updateddict(orlist) object into the original file. ...
# Python Program to Read Text File f = open("D:/work/20190810/sample.txt", "r") data = f.read() print(type(f)) print(type(data)) print(data) 1. 2. 3. 4. 5. 6. 输出结果: 1.1. 读取文本文件里的个别字符 上面的示例中,注意给的是绝对路径,如果给相对路径的话,以执行程序所在目录...
Read mode ('r'): This mode is used to read an existing file. Write mode ('w'): This mode is used to write to a file. It will create a new file if the file does not exist, and overwrite the file if it does exist. Append mode ('a'): This mode is used to add new data ...