In the following example, theread_lines()function is a generator function that reads the file line by line using aforloop and yields each line. defread_lines(file_path):withopen(file_path,'r')asfile:forlineinfile:yieldline.strip()try:forlineinread_lines('data.txt'):print(line)exceptFi...
Python逐行读取文件内容thefile= open("foo.txt") line = thefile.readline() while line: print line, line = thefile.readline() thefile.close()Windows下文件
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_...
""" 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. Retain newline. A non-negative size argument ...
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 ...
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 ...
f = open('test_file.txt', 'r') for line in f: #这样写的效果就是逐行读取文件中的内容,并且内存中始终仅保存读取的这一行内容 此时的f是一个迭代器 print(line) f.close() 1. 2. 3. 4. 查看文件游标所在的位置 f = open('test_file.txt', 'r') print(f.tell()) #0 print(f.read(...
data = xlrd.open_workbook(filename)#文件名以及路径,如果路径或者文件名有中文给前面加一个 r 常用的函数 excel中最重要的方法就是book和sheet的操作 (1)获取book(excel文件)中一个工作表 table = data.sheets()[0]#通过索引顺序获取table = data.sheet_by_index(sheet_indx)#通过索引顺序获取table = data...
1obj_file=open('1.txt','r+')23obj_file.seek(3)45obj_file.truncate()67#不加则是将指针后面的全部删除89read_lines=obj_file.readlines()1011print read_lines1213结果:1415['123'] #使用默认字典,定义默认类型为list, 代码语言:javascript
for line in open(thefilepath): count += 1 However, xreadlines does not return a sequence, and neither does a loop directly on the file object, so you can’t just use len in these cases to get the number of lines. Rather, you have to loop and count line by line, as shown in ...