write()方法写入一个字符串str到文件中。没有返回值。由于缓冲，字符串可能没有加入到实际的文件中，直到调用 flush() 或 close()方法被调用。
语法
以下是 write()方法的语法 -
fileObject.write( str )
参数
-
str -- 这是要写入的文件中的字符串。
返回值
此方法不返回任何值。
示例
下面的示例演示 write()方法的使用。
Assuming that 'foo.txt' file contains following text: This is 1st line This is 2nd line This is 3rd line This is 4th line This is 5th line
#!/usr/bin/python3
# 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，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
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