pythontruncate是什么
1、说明
从文件的首行首字符开始截断,截断文件为n个字符;无n表示从当前位置起截断;截断之后n后面的所有字符被删除。
2、语法
fileObject.truncate( [ size ])
3、参数
size,可选,如果存在则文件截断为 size 字节。
4、返回值
该方法没有返回值。
5、实例
#!/usr/bin/python
# Open a file
fo = open("foo.txt", "rw+")
print "Name of the file: ", fo.name
# Assuming file has following 5 lines
# This is 1st line
# This is 2nd line
# This is 3rd line
# This is 4th line
# This is 5th line
line = fo.readline()
print "Read Line: %s" % (line)
# Now truncate remaining file.
fo.truncate()
# Try to read file now
line = fo.readline()
print "Read Line: %s" % (line)
# Close opend file
fo.close()
当我们运行上面的程序,它会产生以下结果:
Name of the file: foo.txt
Read Line: This is 1st line
Read Line:
以上就是python truncate方法的介绍,在裁剪文件方面经常会使用到,可以就这种方法先进行一个练习。更多Python学习指路:python基础教程
(推荐操作系统:windows7系统、Python 3.9.1,DELL G3电脑。)
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