Python檔案write()方法

Python檔案的write()方法將字串str寫入檔案。此方法沒有返回值。 由於緩衝，在呼叫flush()或close()方法之前，字串可能不會寫入到開啟的相關聯檔案中。

語法

以下是write()方法的語法 -

fileObject.write( str )

引數

• str - 這是要寫入檔案的字串。

返回值

• 此方法不返回任何值。

範例

假設’foo.txt‘檔案中包含以下行 -

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

以下範例顯示了write()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)

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()

執行上面程式碼後，將得到以下結果 -

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

注意： 先建立好 foo.txt 檔案