Python:在一行中搜索STR1并用STR2替换整行 [英] Python: search for a STR1 in a line and replace the whole line with STR2
问题描述
我有一个文件,我需要在其中搜索 STR1
并替换包含 STR2
的整行。例如, file1
包含以下数据
I have a file in which I need to search for STR1
and replace the whole line containing STR2
. For example the file1
contains the following data
Name: John
Height: 6.0
Weight: 190
Eyes: Blue
我需要在上面的文件中搜索 Name
,然后用名称:Robert
替换整行。我可以在sed中轻松完成这项工作
I need to search for Name
in the above file and then replace the whole line with Name: Robert
. I can accomplish this easily in sed as
sed -i 's/.*Name.*/Name:Robert/' file1
但是如何在python中获得相同的结果。例如,我可以使用 fileinput
将一个字符串替换为另一个字符串,如下所示
But how to get the same in python. For example I can replace one string with another string using fileinput
as follows
#! /usr/bin/python
import fileinput
for line in fileinput.input("file1", inplace=True):
# inside this loop the STDOUT will be redirected to the file
# the comma after each print statement is needed to avoid double line breaks
print line.replace("Name: John", "Name: Robert"),
如何修改上述代码以替换整行,使用'*'
替换所有行在文件中即使有搜索条件(如果名称在行
)
How to modify the above code to replace the whole line, using '*'
replaces all the lines in the file even with a search condition (if "Name" in line
)
推荐答案
您可以使用 string.find()
来确定字符串是否在另一个字符串中。 相关的Python文档。
You can use string.find()
to determine if a string is within another string. Related Python docs.
#! /usr/bin/python
import fileinput
for line in fileinput.input("file1", inplace=True):
if line.find("Name:") >= 0:
print "Name: Robert"
else:
print line[:-1]
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