In Python, we read file line by line using different approaches based on clean syntax, ability to read large files, and memory efficiency.
thefile thefile thefile thefile for item in thelist: thefile.write("%s\n"% item) thefile
方法一:复制代码代码如下:f = open("foo.txt") # 返回一个文件对象 line = f.readline() # 调用文件的 readline()方法 while line: print line, # 后面跟 ',' 将忽略换行符 # print( python3 逐行读取文件 Python 换行符 cat file | while read line的问题 循环中的重定向 或许你应该在其他脚本中...
# 读取一行f=open('test.txt','r+',encoding='utf-8')print("读取一行 ===")line=f.readline()whileline:# 打印当前文件指针的位置print("文件指针:",f.tell())print("行内容:",line)line=f.readline()---输出结果如下:读取一行===文件指针:10行内容:1.曼城文件指针:23行内容:2.利物浦文件指针:...
file_object.readline() 优点:readline()方法每次读取一行;返回的是一个字符串对象,保存当前行的内存,不占用内存 缺点:速度比readlines()慢很多 示例代码: # 读取一行f=open('test.txt','r+',encoding='utf-8')print("读取一行 ===")line=f.readline()whileline:# 打印当前文件指针的位置print("文件指针...
line = f.readline() f.close() 输出结果: <type'str'> Hello Welcome Whatisthe fuck... 三、readlines()方法 readlines()方法读取整个文件所有行,保存在一个列表(list)变量中,每行作为一个元素,但读取大文件会比较占内存。 f =open("a.txt") ...
line = f.readline() --- 输出结果如下: 读取一行 === 文件指针: 10 行内容: 1.曼城 文件指针: 23 行内容: 2.利物浦 文件指针: 33 行内容: 3.曼联 文件指针: 46 行内容: 4.切尔西 文件指针: 56 行内容: 5.热刺 文件指针: 69 行内容: 6.阿森纳...
If we want to read a file, we need to open it first. For this, Python has the built-inopenfunction. Python open function Theopenfunction is used to open files in Python. open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None) ...
fileObject.close() strPath = "rocks.txt" fileObject = open(strPath) line = fileObject.readline() print(line) rockList = fileObject.readlines() for rock in rockList: print(rock) fileObject.close() No compute Compute not connected Viewing Kernel not connected Next...
Method 3: Read File as String in Python using the readlines() function Whileread()reads the whole text file into a single Python string, andreadline()reads a line at a time,readlines()reads the text file line by line and returns a list of strings in Python. ...