withopen('example.txt','r')asfile:line_number=1line=file.readline()whileline:print(f"Line{line_number}:{line}")line_number+=1line=file.readline() 1. 2. 3. 4. 5. 6. 7. 运行上述代码后,我们将得到以下输出: Line 1: This is line 1. Line 2: This is line 2. Line 3: This is...
pythonCopy codedefread_specific_line(filename,line_number):withopen(filename,'r')asfile:forline_num,lineinenumerate(file,1):ifline_num==line_number:returnline.rstrip()filename='example.txt'line_number=3line_content=read_specific_line(filename,line_number)print(f'第{line_number}行内容:{line...
number+= 1line= file .readline()#读取一行ifline =='':break#跳出循环print(number,line,end="\n")#输出一行内容 print("\n","="*39,"over","="*39,"\n") 3. 读取全部行 读取全部行的作用同调用read() 方法时不指定size 类似,只不过读取全部行,返回的是一个字符串列表,每个元素为文件的一行内...
next() ValueError: I/O operation on closed file 代码语言:javascript 代码运行次数:0 运行 AI代码解释 In [50]: f1=open('/etc/passwd','r') In [51]: f1. f1.close f1.isatty f1.readinto f1.truncate f1.closed f1.mode f1.readline f1.write f1.encoding f1.name f1.readlines f1....
contents=f1.read()print(contents) 1.2 逐行读取 filename ='pi_digits.txt'with open(filename) as f1:forlineinf1:print(line) 运行结果 3.14159265357979 32384626433832 79 打印每一行时,因为每行末尾都有一个换行符,print语句也会加上一个换行符,因为每行末尾都有两个换行符,要消除这些多余的空白行,可在...
#1. 先读后写f1 =open('其他模式', encoding='utf-8', mode='r+')content = f1.read()print(content)f1.write('Python开发者')f1.close() #2. 先写后读(错误实例)f1 =open('其他模式', encoding='utf-8', mode='r+')f1.write('Python开发者'...
content = f1.read() print(content) open()内置函数,open底层调用的是操作系统的接口。 f1变量,又叫文件句柄,通常文件句柄命名有f1,fh,file_handler,f_h,对文件进行的任何操作,都得通过文件句柄.方法的形式。 encoding:可以不写。不写参数,默认的编码本是操作系统默认的编码本。windows默认gbk,linux默认utf-8...
Reading File in Chunks The read() (without argument) and readlines() methods reads the all data into memory at once. So don't use them to read large files. A better approach is to read the file in chunks using the read() or read the file line by line using the readline(), as ...
# Maximum number of file downloading retries. MAX_TIMES_RETRY_DOWNLOAD = 3 MAX_TIMES_RETRY = 5 DELAY_INTERVAL = 10 # Define the file length. FELMNAMME_127 = 127 FELMNAMME_64 = 64 FELMNAMME_4 = 4 FELMNAMME_5 = 5 # Mode for activating the device deployment file EFFECTIVE_MODE_REBOOT...
-l, --line-length INTEGER How many characters per line to allow. [default:88] -t, --target-version [py33|py34|py35|py36|py37|py38|py39|py310] Python versions that should be supported by Black's output. [default: per-file auto- ...