Python3 file.writelines()方法
writelines()方法讀取字符串的序列到文件。該序列可以是一個迭代對象生產的字符串,通常是字符串列表。這個函數沒有返回值。
語法
下面是 writelines()方法的語法 -
fileObject.writelines( sequence )
參數
- sequence -- 這是字符串的序列。
返回值
此方法不返回任何值。
示例
下面的例子顯示 writelines()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)
seq = ["This is 6th line\n", "This is 7th line"]
Write sequence of lines at the end of the file.
fo.seek(0, 2)
line = fo.writelines( seq )
Now read complete file from beginning.
fo.seek(0,0)
for index in range(7):
line = next(fo)
print ("Line No %d - %s" % (index, line))
Close opened file
fo.close()
當我們運行上面的程序,會產生以下結果 -
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
Line No 6 - This is 7th line