"Go" using Python to modify the contents of a file

Original address: http://blog.csdn.net/xsckernel/article/details/9007517

As a result of the transfer of an arm project under ads to the GNU project, a lot of repetitive changes are needed, such as

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1. ABC EQU 1

Modified to:

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1. #define ABC 1

If a manual modification is a waste of time, so the Python script to do the work, found that it is easy to do (previously encountered similar problems are always written in C code, the amount of code and error prone!!) ）

The source code is as follows:

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2. def func ():
4. Ffrom=open ("2440init.s","R")
6. Fto=open ("2440init1.s","W")
8. while True:
10. L = Ffrom.readline ()
12. if not L:
14. Break
16. if ' EQU ' in L:
18. temp = L.split ("EQU")
20. Temp1 = ' #define ' + temp[0] + temp[1]
22. #print Temp1
26. Fto.write (TEMP1)
28. Else:
30. Temp1 = L
32. Fto.write (TEMP1)
36. if __name__ = = "__main__":
38. Func ()

Use a file 2440init.s to test:

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1. ABC EQU 1
2. PDS EQU 9

The resulting file 2440init1.s content is as follows:

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1. #define ABC 1
2. #define PDS 9

The first thing that's said is to replace the contents of the file Ffrom with FTO Open should be the same file, but found that the write file output stream opened, will automatically empty the file (except append mode) looks like Java performance.

Can be done with the following code

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2. def func ():
4. input = open ("2440init.s")
6. lines = Input.readlines ()
8. Input.close ()
12. Output = open ("2440init.s",' W ');
14. For line in lines:
16. #print Line
18. if not line:
20. Break
22. if ' EQU ' in line:
24. temp = Line.split ("EQU")
26. Temp1 = ' #define ' + temp[0] + temp[1]
28. Output.write (TEMP1)
30. Else:
32. Output.write (line)
34. Output.close ()
38. if __name__ = = "__main__":
40. Func ()

If you have a larger project file, you need to traverse every file in the project. If the file contains the specified string, such as #include "appdef.h", replace it with #include "datatype.h":

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2. Import OS
6. Def direc ():
8. For D,FD,FL in os.walk ('/home/shichao/gun-ucos '):
10. For F in FL:
12. Sufix = Os.path.splitext (f) [1][1:]
14. if ((Sufix = = ' h ') or (Sufix = = ' C ')):
16. #print Sufix
18. Func (d + '/' + f)
24. def func (filename):
26. input = open (filename)
28. lines = Input.readlines ()
30. Input.close ()
34. Output = open (filename,' W ')
36. For line in lines:
38. if not line:
40. Break
42. if ((' appdef.h ' line ) and (' include ') :
44. temp = Line.split ("Appdef")
46. Temp1 = temp[0] + ' datatype ' + temp[1]
48. Output.write (TEMP1)
50. Else:
52. Output.write (line)
54. Output.close ()
58. if __name__ = = "__main__":
60. Direc ()

"Go" using Python to modify the contents of a file