Python文件write()方法

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Python文件的write()方法将字符串str写入文件。此方法没有返回值。 由于缓冲，在调用flush()或close()方法之前，字符串可能不会写入到打开的相关联文件中。

语法

以下是write()方法的语法 -

fileObject.write( str )

参数

• str - 这是要写入文件的字符串。

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()

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

注意： 先创建好 foo.txt 文件

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