In Python, we read file line by line using different approaches based on clean syntax, ability to read large files, and memory efficiency.
lines = [line.strip() for line in file] 1.1. Using For Loop The for loop is the most straightforward and efficient method for reading a text file line by line. In the following example: The open() function opens the file named ‘data.txt‘ in read mode. The for loop iterates ov...
thefile thefile thefile thefile for item in thelist: thefile.write("%s\n"% item) thefile
释放资源file.close()# 遍历行列表并逐行输出到控制台forlineinlines:print(line.strip())# 调用read_...
withopen(`example.txt`,`r`)asfile:line=file.readline()# 读取第一行whileline:print(line.strip())# 打印每行内容,去除行末的换行符line=file.readline()# 继续读取下一行 这种方法在处理较大的文件时非常有效,可以逐行读取并进行操作,避免占用过多内存。
write(b'hello world!\r\n') f.seek(0) print(f.read().decode()) 运行结果:hello world!最后还剩下一个x 模式,表示创建一个新的文件,如果文件已经存在,会抛出异常。>> with open(path, 'x') as f: pass FileExistsError: [Errno 17] File exists: 'data_1.txt'除了这一点,x 模式和覆盖写的 ...
file2.write('"'+line[:]+'"'+",")ifnot line : #如果行读取完成,就直接跳出循环break#记住文件处理完成关闭文件是一个号习惯 file1.close() file2.close() 读文件有3种方法: read()将文本文件所有行读到一个字符串中。 readline()是一行一行的读,在读取中间可以做一些判断 ...
""" readinto() -> Undocumented. Don't use this; it may go away. """ pass def readline(self, size=None): # real signature unknown; restored from __doc__ 仅读取一行数据 """readline([size]) -> next line from the file, as a string. ...
file=open('data.txt','r')lines=[lineforlineinfile]file.close() 10、关于Python中的命名空间(namespace),以下说法错误的是:()A.命名空间用于避免变量名冲突B.全局命名空间在程序运行时一直存在C.函数内部的变量属于局部命名空间D.不同模块中的命名空间是相互独立的,不能相互访问11、Python中的上下文管理器(...
Python is considered to be concise and easy to read Python can be interpreted one line at a time, which makes it easy to find mistakes or errors Python is highly versatile can be used for both small and complex tasks Python is used across multiple industries such ...