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Python中操作文件之write()方法的使用教程

 更新時(shí)間：2015年05月25日 09:25:08   投稿：goldensun  
這篇文章主要介紹了Python中操作文件之write()方法的使用教程,是Python入門學(xué)習(xí)中的基礎(chǔ)知識(shí),需要的朋友可以參考下

 write()方法把字符串str寫入文件。沒(méi)有返回值。由于緩沖，字符串可能不實(shí)際顯示文件，直到flush()或close()方法被調(diào)用。
語(yǔ)法

以下是write()方法的語(yǔ)法：

fileObject.write( str )

參數(shù)

  •     str -- 這是要被寫入的文件中的字符串。

返回值

此方法不返回任何值。
例子

下面的例子顯示write()方法的使用。

#!/usr/bin/python

# Open a file in write mode
fo = open("foo.txt", "rw+")
print "Name of the file: ", fo.name

# Assuming file has following 5 lines
# This is 1st line
# This is 2nd line
# This is 3rd line
# This is 4th line
# This is 5th line

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 = fo.next()
  print "Line No %d - %s" % (index, line)

# Close opend file
fo.close()

當(dāng)我們運(yùn)行上面的程序，它會(huì)產(chǎn)生以下結(jié)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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