Python 文件 write() 方法

write() 方法用于将字符串写入文件中。没有返回值。由于缓冲，直到调用flush()或close()方法之前，字符串可能不会真正显示在文件中。

语法

以下是 write() 方法的语法：

fileObject.write( str )

参数

str - 要写入文件中的字符串。

返回值

该方法不返回任何值。

以下示例演示了write()方法的用法。

假设’foo.txt’文件包含以下文本 –

This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line

示例

# Open a file in read/write mode
fo = open("abc.txt", "r+")
print ("Name of the file: ", fo.name)
str = "This is 6th line"

# Write a line at the end of the file.
fo.seek(0, 2)
line = fo.write( str )

# Now read complete file from beginning.
fo.seek(0,0)
for index in range(6):
   line = next(fo)
   print ("Line No %d - %s" % (index, line))

# Close opened file
fo.close()

当我们运行上面的程序时，它会产生以下结果−

Name of the file: foo.txt
Line No 0 - This is 1st line
Line No 1 - This is 2nd line
Line No 2 - This is 3rd line
Line No 3 - This is 4th line
Line No 4 - This is 5th line
Line No 5 - This is 6th line