Python3 file.write()方法

write()方法寫入一個字串str到檔案中。沒有返回值。由於緩衝，字串可能沒有加入到實際的檔案中，直到呼叫 flush() 或 close()方法被呼叫。

語法

以下是 write()方法的語法 -

fileObject.write( str )

引數

str -- 這是要寫入的檔案中的字串。

返回值

此方法不返回任何值。

範例

下面的範例演示 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()

當我們執行上面的程式，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