python - How do I write to the middle of a text file while reading its contents? -


first of helping me out moving files , helping me in tcl script.

small doubt had python code.. below..

import os import shutil  data =" set filelid [open \"c:/sanity_automation/work_project/output/smoketestresult\" w+] \n\         puts $filelid \n\         close $filelid \n"    path = "c:\\sanity_automation\\routertester900systemtest" if os.path.exists(path):     shutil.rmtree('c:\\sanity_automation\\routertester900systemtest\\')  path = "c:\\program files (x86)" if os.path.exists(path):     src= "c:\\program files (x86)\\abc\\xyz\\quicktest\\scripts\\routertester900\\diagnostic\\routertester900systemtest" else:     src= "c:\\program files\\abc\\xyz\\quicktest\\scripts\\routertester900\\diagnostic\\routertester900systemtest" dest = "c:\\sanity_automation\\routertester900systemtest\\"  shutil.copytree(src, dest) log = open('c:\\sanity_automation\\routertester900systemtest\\routertester900systemtest.app.tcl','r+') log_read=log.readlines() x="closealloutputfile" open('c:\\sanity_automation\\routertester900systemtest\\routertester900systemtest.app.tcl', 'a+') fout:         line in log_read:           if x in line:             fout.seek(0,1)             fout.write("\n")             fout.write(data)

this code copying files 1 location another, searching keyword in particular file , writing data file working...

my doubt whenever write.. writes end of file instead of current location...

example: say.. copied file program files sanity folder , searched word "closealloutputfile" in 1 of copied file. when word found, should insert text in position instead of end of file.

a simple way add data in middle of file use fileinput module:

import fileinput  line in fileinput.input(r'c:\sanity_automation\....tcl', inplace=1):     print line, # preserve old content     if x in line:        print data # insert new data

from the fileinput docs:

optional in-place filtering: if keyword argument inplace=1 passed fileinput.input() or fileinput constructor, file moved backup file , standard output directed input file (if file of same name backup file exists, replaced silently). makes possible write filter rewrites input file in place. if backup parameter given (typically backup='.'), specifies extension backup file, , backup file remains around; default, extension '.bak' , deleted when output file closed.

to insert data filename file while reading without using fileinput:

import os tempfile import namedtemporaryfile  dirpath = os.path.dirname(filename) open(filename) file, \      namedtemporaryfile("w", dir=dirpath, delete=false) outfile:     line in file:         print >>outfile, line, # copy old content         if x in line:            print >>outfile, data # insert new data  os.remove(filename) # rename() doesn't overwrite on windows os.rename(outfile.name, filename)

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