Python 3 – 文件 writelines() 方法
描述
方法 writelines() 将字符串序列写入文件。该序列可以是任何生成字符串的可迭代对象,通常是字符串列表。该方法没有返回值。
语法
写入行的语法如下: writelines() 方法的语法如下所示:
fileObject.writelines( sequence )
参数
sequence − 这是字符串序列。
返回值
该方法不返回任何值。
示例
以下示例显示了 writelines() 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
#!/usr/bin/python3
# 以读写模式打开文件
fo = open("abc.txt", "r+")
print ("文件名:", fo.name)
seq = ["This is 6th line\n", "This is 7th line"]
# 在文件末尾写入行序列。
fo.seek(0, 2)
line = fo.writelines( seq )
# 从文件开头读取完整文件。
fo.seek(0,0)
for index in range(7):
line = next(fo)
print ("Line No %d - %s" % (index, line))
# 关闭打开的文件
fo.close()
结果
运行上述程序时,将产生以下结果−
文件名: 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