Learn to use theseek()method to move the file cursor ahead or backward from the current position Learn to move the file pointer to that start or end of the file Learn to move the file pointer backward from the end of the file Get the current position of the file handle What isseek()...
# 打开文件file=open('example.txt','r+')# 移动文件指针到文件末尾file.seek(0,2)# 写入一些内容file.write('\nAppend this line to the end of the file.')# 关闭文件file.close() 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 在这个示例中,我们首先以读写模式打开文件example.txt。然后使用f...
In text files (those opened without a b in the mode string), only seeks relative to the beginning of the file are allowed (the exception being seeking to the very file end with seek(0, 2)).（https://docs.python.org/3.2/tutorial/inputoutput.html#methods-of-file-objects）
seek(offset,from)有2个参数: offset:偏移量,正数代表往右移动,负数代表往左移动。from:指针从哪里开始移动0:表示文件开头1:表示当前位置2:表示文件末尾 官方文档原话:In text files (those opened without a b in the mode string),only seeks relative to the beginning of the file are allowed (the excepti...
seek(0)和f.seek(0,0)是没有区别的。file.seek()方法标准格式是：seek(offset,whence=0)offset：开始的偏移量，也就是代表需要移动偏移的字节数whence：给offset参数一个定义，表示要从哪个位置开始偏移；0代表从文件开头开始算起，1代表从当前位置开始算起，2代表从文件末尾算起。默认为0 whence ...
SEEK_SET or 0 (offset from start of file, offset should be >= 0); other values are SEEK_CUR or 1 (move relative to current position, positive or negative), and SEEK_END or 2 (move relative to end of file, usually negative, although ...
seek(0) # 读取第一行 first_line = file.readline() print(first_line) # 移动到文件的末尾 file.seek(0, 2) # 尝试从文件末尾读取内容(不会读取到任何内容) end_content = file.read() print(end_content) # 输出将为空 这个例子首先移动到文件的第11个字节处,然后读取并打印从那里到文件末尾的所有...
seeking beyond the end of a file). If the file is opened in text mode, only offsets returned by tell() are legal. Use of other offsets causes undefined behavior. Note that not all file objects are seekable. """ pass def tell(self): # real signature unknown; restored from __doc_...
import numpy as np def stlGetFormat(fileName): fid = open(fileName,'rb') fid.seek(0,2) # Go to the end of the file fidSIZE = fid.tell() # Check the size of the file if (fidSIZE-84)%50 > 0: stlFORMAT = 'ascii' else: fid.seek(0,0) # go to the beginning of the fil...
seek(offset [,from])方法改变当前文件的位置。Offset变量表示要移动的字节数。From变量指定开始移动字节的参考位置。如果from被设为0,这意味着将文件的开头作为移动字节的参考位置。如果设为1,则使用当前的位置作为参考位置。如果它被设为2,那么该文件的末尾将作...