Python: replacing strings in a file

tonya11en · 05-19-2009, 11:13 AM

I am trying to write a program that contains a loop that replaces file names in a text file with names from a set list that I have. It fails to run and I was hoping somebody could tell me why and/or figure out how to get it working.

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import string, sys, os, re, fileinput

i = ['zeta21000.nc','zeta21001.nc','zeta21002.nc','zeta21003.nc','zeta21004.nc','zeta21005.nc','zeta21006 .nc','zeta21007.nc','zeta21008.nc','zeta21009.nc','zeta21010.nc','zeta21011.nc','zeta21012.nc','zeta 21013.nc','zeta21014.nc','zeta21015.nc','zeta21016.nc','zeta21017.nc','zeta21018.nc','zeta21019.nc', 'zeta21020.nc','zeta21021.nc','zeta21022.nc','zeta21023.nc','zeta21024.nc','zeta21025.nc']

j =['zeta2Em007','4Em007','8_00Em007','1_60Em006','3_20Em006','6_40Em006','1_28Em005','2_56Em005','5_12E m005','1_02Em004','2_05Em004','4_10Em004','8_19Em004','1_64Em003','3_28Em003','6_55Em003','1_31Em002 ','2_62Em002','5_24Em002','1_05Em001','2_10Em001','4_19Em001','8_39Em001','1_68E000','3_36E000','6_7 1E000']

o = open("ensight_command","w")
data = open("ensight_command").read()

for x in range(0,26)
os.system("ensight82 -p ensight_command")
o.write( re.sub(i[x],i[x+1],data))
o.write( re.sub(j[x],j[x+1],data))
#ensightfile = ensightfile.replace(i[x], i[x+1])
#ensightfile = ensightfile.replace(j[x], j[x+1])

o.close()

The_Kernel · 05-19-2009, 01:13 PM

It would be easier to use a dictionary to store the search and replace terms. Also there's no need to write all the intermediate steps out to the file, just save them as string. As a generic solution here's what I'd do:

Code:

replace_dict = {'foo': 'bar',   
                'help': 'okay',
                'more': 'less'}
 
lines = open('test_file.txt').read() 
 
for search, replace in replace_dict.items():
    lines = lines.replace(search, replace)
 
out_file = open('test_file.txt', 'w')
out_file.write(lines) 
out_file.close()

ghostdog74 · 05-19-2009, 06:52 PM

Quote:

Originally Posted by tonya11en

Code:

o = open("ensight_command","w")
data = open("ensight_command").read()

use fileinput , since you already imported it.