Python文件writelines()方法

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Python文件的writelines()方法将一串字符串写入到文件。该序列可以是生成字符串的任何可迭代对象，通常是字符串列表。此方法没有返回值。

语法

以下是writelines()方法的语法 -

fileObject.writelines( sequence )

参数

• sequence - 这是要写入文件的字符串序列。

返回值

• 此方法不返回任何值。

示例

假设’foo.txt‘文件中包含以下行 -

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

以下示例显示了writelines()方法的用法。

#!/usr/bin/python3
#coding=utf-8


# Open a file in read/write mode
fo = open("foo.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()

执行上面代码后，将得到以下结果 -

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
Line No 6 - This is 7th line

注意： 先创建好 foo.txt 文件

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